Showing posts with label Fender. Show all posts
Showing posts with label Fender. Show all posts

Thursday, 31 December 2009

Best small tube (Valve) Guitar Amp?

The Fender Champ was a guitar amplifier made by Fender. It was introduced in 1948 and discontinued in 1982. [1] An updated version was introduced in 2006 as part of the "Vintage Modified" line.

The Champ had the lowest power output and the simplest circuit for all of the Fender tube amps. The Champ had only one power tube, which meant that the circuit is single ended and class A. Five watts and the simple toneful circuit allowed the Champ to be used easily and often in recording studios.

First introduced in 1948, it sported the name "Champion 800" (with 8" speaker), changing a year later to "Champion 600" (6" speaker) with circuit designation 5B1. It was rated at about 3 watts, featuring a "T.V. Front" style cabinet with two-tone blonde & brown vinyl covering. This style lasted until 1953, when Fender's cabinet style changed to the "Wide Panel" design with a tweed cloth covering. Fender also renamed the circuit the 5C1, 5 standing for the decade (1950s), C for the third circuit revision, and 1 was the Champ's circuit designation. The 5C1 circuit was extraordinarily simple, using one 6SJ7 pentode in the preamplifier section to provide a single stage of voltage amplification, one 6V6 beam power tetrode in the power amplifier section, and a single volume knob and no tone controls.

By 1955 Fender started putting its amps in the "Narrow Panel" tweed cabinet with a plastic oxblood color grill cloth[2], and by this time the Champ was officially named the Champ (model 5E1). Through 1957, Champs only had a six inch speaker, but the 1958 model 5F1 featured an 8". The 5E1 and 5F1 circuits used a 12AX7 dual triode in the preamplifier to provide two stages of voltage amplification, and a single 6V6GT power tube to produce about 5 watts. A Champ from this era can easily be dated by the code stamped on the tube chart,[3] by the code stamped on the speaker[4] or by its serial number.[5]

Monday, 23 November 2009

Marshall Guitar Amp - Find the Perfect Amp

Choosing an amplifier for your guitar can be a tough thing. In this article you are about to read, we are going to be reviewing some of the top Marshall Guitar Amps. These amps include the Marshall MG412A, the MHZ40C, the AS50D, the JVM215C 2-channel guitar combo amp, and the JVM205C

1 - Marshall MG412A Angled Guitar Speaker Cabinet

The first Marshall guitar amp we are going to be reviewing is the Marshall MG412A. This amp is slowly becoming one of Marshalls most popular amps for a variety of reasons. It has great sound and the footstep makes a huge difference. It has a diverse sound and is extremely easy to use. If you are new to playing the guitar it is highly recommended you start with this amp.

2 - Marshall MHZ40C Haze Guitar Combo Amplifier

Although this amp only has 40 watts, it produces sound like it has a lot more. You know you have found yourself a good amp when it produces as much noise as an amp with up to 70 watts. The benefit of this amplifier is the fact that because it only has 40 watts the price is cheaper because it costs less money to make.

3 - Marshall AS50D Acoustic Guitar Amplifier

If you play the acoustic guitar, then I cannot see a better amp than this one. It doesn't have all the fancy gadgets that all the other amps have because with the acoustic guitar you simply don't need them. This amp also produces some loud noise at 50 watts.

4 - Marshall JVM215C 2-Channel Guitar Combo Amplifier

This amplifier is probably different than the majority of other amplifiers you have seen. If you have ever played with a combo amp you know how they can sound. This amp can switch the distortion back and forth so quickly you will not be able to believe what you are hearing! It has an outstanding sound tone to it, it is very flexible for beginners all the way to advanced, and is easy to control. The only downside is this amplifier can be a bit pricey.

5 - Marshall JVM205C Guitar Combo Amplifier

The last amp we will be reviewing today is the Marshall JVM205. Like the amp above, this is a combo amp. The amp is 2x12 in. and comes with 50 watts. If you are planning to just play around with some friends then this will be the perfect amp. However, if you are going to be playing in a concert then this amp probably will not get the job done.

You just read a review of some of the best amps Marshall produces. Don't let the fear of choosing the wrong amp hold you back from playing great music!
Find The Perfect Guitar Amp

There are many Marshall Guitar Amps available today. Find The Perfect One For You!

http://electricguitaramps.info/marshall-guitar-amp

Article Source: http://EzineArticles.com/?expert=David_Wesenburg

Tuesday, 10 November 2009

The Ultimate Tone - A Book Review of the Best DIY Guitar Tube Amplifier Series

This article is a book review on a series of six books that is the most comprehensive and lucid explanation of guitar tube amp architecture, circuits, tone, components and construction technique for DIYers I have ever found. The review deals with each book separately and recommends purchasing them in a specific order to grow your knowledge in step with your building experience.

Kevin O'Connor of London Power has created a series of books under the main title of "The Ultimate Tone." These books are truly unique and carefully tailored for the Do-It-Yourself (DIY) guitar tube amp hobbyist and boutique amplifier builder. The books have a home-made 'feel' as well... all the illustrations are done by hand and the books are photocopy-printed on 8.5″x11″ paper and bound with plastic spines and clear plastic covers. There are six books in the series now with the most recent being released in the late spring of 2008. You may want to buy the entire series all at once and get a modest savings, but I think you should consider buying them one at a time and digest as you go, building projects along the way. A key point though... you don't necessarily want to buy them in numerical order. I recommend the following sequence:

The Ultimate Tone Volume 3 - Generations of Tone
The Ultimate Tone Volume 5 - Tone Capture
The Ultimate Tone Volume 2 - Systems Approach to Stage Sound Nirvana
The Ultimate Tone Volume 4 - Advanced Techniques for Modern Guitar Amp Design
The Ultimate Tone - Modifying and Custom Building Tube Guitar Amps
The Ultimate Tone Volume 6 - Timeless Tone Built for the Future Today


The Ultimate Tone Volume 3 - Generations of Tone

This is the most important book in the series for the beginning tube amp builder.

Chapters 2 through 4 lay down the foundation of good DIY tube amp construction, filling you in on good electrical connections, grounding technique, lead dress and other wiring techniques, and mechanical layout including assembly methods like terminal strips, turret and eyelet boards.

The subsequent chapters each pick a particular 'iconic' amplifier, each iconic amplifier being a prototypical example of amplifiers of its class, and they are examined in detail as to the circuit topology, peculiar tonal characteristics that result and fatal flaws that the product is notorious for. Kevin provides the original schematics and then shows how you can apply the techniques detailed in the earlier chapters to improve the performance and reliability of the icon without harming the tone. The schematics are redrawn, layouts are provided and mechanical solutions are worked out to make each chapter a complete, self-contained, build-it-yourself amp project.

This process is repeated for several variations of the Champ in chapter 5 (this chapter greatly influenced my own single-ended amp project), then in quick succession: the Bassman, Plexi, 800, Bull Dog, AC-30, Portaflex, SVT, Bass Master, Custom Special, Guitar Mate, Herzog and Laney amplifiers are dealt with.

If you can only buy one book for your DIY guitar amp hobby I'd heartily recommend this one.

The Ultimate Tone Volume 5 - Tone Capture

Volume 5 picks up where Volume 3 left off, with a project-oriented approach and some sophisticated DIY tube amp solutions for guitar and bass.

The book starts off with a chapter overviewing vacuum tube operation called 'tube tone,' followed up by a chapter on guitar electronics and pickup characteristics.

The next two chapters are small projects: Sigma for effects switching and Triple-X for amplifier switching.

Chapters 5 & 6 are on transformers... important components but it made me yawn, sorry.

Starting with chapter 7, all the stops are pulled out and you are in project heaven... Major (200W), Soma 84 (EL84 amp), Standard (the London Power Standard Preamp from 1995 coupled to a 50W amp using four power tubes), Doppelsonde (mixing power tube types), AX84 (discussion on the original goal of a very low output power amp), Kelly (50W from 4 6V6s), and several other projects of lesser scope.

One favorite project I did was based on Kevin's reworking of the HotBox tube preamp pedal from Matchless in chapter 16. I built this pedal in a truly "true point-to-point style" (meaning terminal strips) in a tube pedal enclosure from Doug Hoffman, substituting a Baxandall tone stack and reworking the preamp values to be more Dumble-esqe (non-HRM type).

What would you do to match an amplifier to Yngwie Malmsteen's style? See chapter 18, 'Swede.'

The Ultimate Tone Volume 2 - Systems Approach to Stage Sound Nirvana

Volume 2 is not project oriented. The bulk of the book, chapters 2 through 5, deals with power supply tricks and a comprehensive overview of power amplifiers, including tube, solid-state and hybrid power amps. Chapter 3, on tube power amplifiers, has some very practical information on mods and fixes to Marshall and Fender bias circuits.

I like the 1st and last chapters of Volume 2 the best. The first chapter is a short discussion of sound stages and how you might setup your gear on stage for the best audience/band experience. The last, chapter 6, is called "Pillars of Tone" and in this chapter the major contributors tone at the block-level of a guitar tube amplifier system design are discussed one by one and Kevin provides some very valuable insight into tone shaping throughout the preamp/amplifier.

The Ultimate Tone Volume 4 - Advanced Techniques for Modern Guitar Amp Design

This is the book you'll want to buy if you feel the need to get deeply involved with the power scaling technology that Kevin has developed. Power Scaling, coined and trademarked by Kevin, is the way you can get aspects of power amp distortion (as opposed to preamp distortion) into your tone at bedroom volume levels. Volume 4 is not DIY project oriented but explores the issues, including attenuation, power scaling (both down and up), sag, and power management, tackled by modern guitar tube amp designers.

That said, the second-to-last chapter in Volume 4 might be important for a broader group of enthusiast builders... design philosophy. In this chapter Kevin provides a hierarchical design process that could be used to make key decisions on how you approach your next project.

The Ultimate Tone - Modifying and Custom Building Tube Guitar Amps

There is no volume number in the title of this book, it was the 1st. Personally, I bought it for completeness. I specifically wanted to have the 'perfect effects loop' information, although the loop itself is incorporated into a project in Volume 5. TUT also has some excellent material on reverbs and signal switching methods that is not explained in the other volumes. The first half of TUT introduces/overviews tube amp systems, power supplies & grounds then focuses on preamp and power amp modifications to commercial amplifiers (e.g. Marshall / Fender)... if you are totally new to tube electronics you may want to buy this 1st volume at the same time as Volume 3.

The Ultimate Tone Volume 6 - Timeless Tone Built for the Future Today

In many ways, Volume 6 is a continuation and extension of the material in Volume 4, where Power Scaling is introduced. In Volume 6 a new 'direct control' version of Powerscaling is featured which was introduced in Vol 4 but flushed out with comprehensive circuits and applied to 'sag' and sustain control as well in Vol 6. The new scaling circuits have many advantages for a DIY builder like greater noise immunity and less sensitivity to layout, etc.

I applied the new DC Power Scaling to a Trainwreck clone project and was really impressed with the improvement in 'playability' at lower volumes... the unmodified Trainwreck Express circuit is just too loud for domestic use, needing to be cranked to get the sweet tones it is renowned for.

One of the chapters in Volume 6 is dedicated to the Dumble amplifiers... something I was really looking forward to since many of my hobby projects focus on those circuits. I found this short chapter to be a good introduction to the overall architecture of the Dumble amps, written from the point of view of the evolution from the early modified standard amps that Alexander Dumble started out doing, but I felt the chapter fell short in discussing some of the more important subtleties of the later Dumble models.

Volume 6 also has lots of other material in it, including a great tutorial on designing really high output power amplifiers and a great chapter on high gain amplifier designs with real-world circuits referenced and detailed.

In Summary...

Kevin's books have a very empirical approach. He encourages you to set aside convention in some instances or not be afraid to try combinations of tubes or even pulling tubes and in all cases clearly explains why it is o.k. and points out any reasons why it wouldn't be o.k. All the examples in the books are very practical and he certainly has the DIYer in mind as he is writing.

Kevin's body of work is truly encyclopedic in nature, and considering that, one feature sorely lacking from his books is any kind of indexing... this is aggravated by the fact that Kevin constantly refers to previous writings rather than repeat himself in a new volume, and it is very difficult to put your finger on the reference even with the other book in hand. Perhaps search engine technology, like Google's ability to search protected content, could be put to good use in this case and provide a kind of 'auto-index' on the web of all of Kevin's books without actually giving away the book itself. Or better yet, how about an e-book format of Kevin's entire collection of TUT books... I think all of the e-book readers include searching capabilities... and Kevin's hand-drawn schematics would probably scale adequately and be very readable on the e-paper displays these devices feature.

Meanwhile, how do you get Kevin's books today? The best way to get the books is to directly order them from London Power Press. They now have a shopping cart on http://www.londonpower.com.
About the author: Mark Roberts blogs on DIY tube electronics at TubeNexus.com. He is avidly involved in guitar electronics as a hobby and dabbles in boutique effects pedals as a business with Cause & Effect Pedals. Please visit the TubeNexus Blog at http://tubenexus.com for more articles and book reviews about DIY Guitar Tube Amplifiers and Effect Electronics.

Article Source: http://EzineArticles.com/?expert=Mark_Douglas_Roberts

Friday, 6 November 2009

The Four Types Of Guitar Amps

There are a few different types of guitar amplifiers that are on the market today for you to choose from. If you are shopping for a new amp, it's good to decide which type you will want because they are all very different.

The first type of amps that came along had to be the tube amplifiers. Funny thing is, even though the technology of tube amps is fairly old, these amps are still used widely among pro and beginner guitar players. The reason for their popularity is that the tone of these amps is usually very warm and natural compared to the other types. Not only do they sound better, they are usually louder than amps of other types and the same power level. The only thing to remember with tube amps is that they require maintenance because the vacuum tubes need to be periodically changed.

Usually there are two types of tubes in an amp - the preamp section and the power section. Common tubes are 12AX7, 6L6, EL34, and many more.

There are many different brands of guitar amps that use tubes -- Marshall, Soldano, Peavey, Genz-Benz, Mesa Boogie and many others -- especially older and vintage guitar amps.

Solid state amps were invented to replace tube amps (which didn't happen!). Basically, the main difference between tube and solid state amps is that solid state uses transistors instead of tubes. They also require almost no maintenance because there are no tubes to change.

This is not to say that solid state amps are not as good as tube, it just all depends on the application and type of music you are going to be playing.

Some guitarists prefer colliding the two and making what is called a hybrid amp. This type of amps marries both tube and transistor amps into one. Usually there are tubes at one stage of amplification and transistors at the other stage (preamp and power amp)

Recently, digital amps were introduced. These amps use computers and integrated circuits to create the various tones in the amps. Usually, there are a number of different types of effects and tons that you can get. These amps are very versatile.

Examples of some digital amps are Vox Valvetronix, Line6, and a few more. These amps are great if you want to play all different types of music with different types of guitars.


Corey Palmer is a guitarist and musician. Marshall Amps

Wednesday, 4 November 2009

Blues Junior Professional - Fender's Classic Blues Amp - Portable Yet Powerful

The Fender company, in 1995, launched the 'Blues Junior' professional tube guitar amplifier. The tube driven design of the Fender Blues Junior delivers warm tones that aim to mimic the classic style of 1950s American blues and blues rock music.

This particular guitar amplifier is popular model for the Fender company. New models, often released to market, feature upgradable internal components with minor external changes while retaining the core tube driven design.

In overview, the Fender Blues Junior Guitar Amp is a warm-toned all-tube preamp with power amp circuitry that produces fat tone at moderate volumes. This guitar amplifier delivers 15 watts through a 12 inch speaker. The renowned warm tones are achieved by a pair of EL-84 Groove Tube output tubes plus three 12AX7 preamp tubes. The classic blues tones are enhanced by Fender reverb, flexible controls and a FAT circuit with footswitch control options. Main Features at a glance:

The BLUES JUNIOR guitar amplifier is an ideal practice or studio amp with big blues tone in a portable compact unit
All Tube
15 watts into 8 ohms output
1-12 inch Fender® Special Design 8 ohm, 50 watt Speaker
1 Channel input
"Fat" Switch, Reverb, Footswitch Jack for Remote "Fat" on/off (footswitch optional extra), Chrome Panel, Vintage Pointer Knobs
Reverb, Master, Middle, Bass, Treble, "Fat" Switch and Volume panel controls
Weighs 31 lbs. (14.06 kg)
Height: 16 inch (40.64 cm), Width: 18 inch (45.72 cm), Depth: 9.18 inch (23.31 cm)


Owners of the Fender Blues Junior Amplifier do report some limitations of this amp. For example: it's performance is not appropriate for the heavy metal genre, where a Marshall guitar amplifier may be better suited. However, for blues / blues rock the Fender blues junior guitar amplifier delivers the necessary distortion effect.

In the digital age, the internet is often the first resource channel for researching and in fact buying guitar amplifiers. Reviews and comparisons are easily found, which arms the buyer for a more informed choice. Regarding actually buying items from the internet, then there are many trustworthy avenues. For example, the safety and technology built into ebay means buyers can safely and confidently buy from the internet.

More specifically, it is well advised to consider ebay Partner or Affiliate type websites. Why? Simply because these type of sites are designed to distill very specific niches into an easy to navigate website. The design of the navigation system found on ebay Partner websites assist the visitor to browse and identify items for purchase a little easier than the ebay navigation system. In fact, that is the primary purpose of ebay type Partner websites, namely, to make the browse and search experience easier for the visitor, while capitalizing on the safety and security of ebay proper.
Written by Silver Leonard, owner of a portfolio of sites, which can be viewed here: http://looknooks.com/

Article Source: http://EzineArticles.com/?expert=Silver_Leonard

Tuesday, 3 November 2009

Brands of Guitar Amplifiers, Marshall, Fender, Mesa etc

A wide range of instrument amplifiers is now available, some for general purposes and some designed for specific instruments and even for particular sounds. Traditional guitar amplifiers come up with a clean, warm sound, a sharp treble roll off at 5 kHz or less and bass roll off at 60 to100 Hz, often with built in reverb and tremolo units. Bass amplifiers have extended bass response and tone controls optimized for bass guitars (or more rarely, for upright bass).

Higher end bass amplifiers sometimes include compressor or limited features, which help to keep the amplifier from distorting at high volume levels. Keyboard amplifiers have a very low distortion and extended flat frequency response in both directions. Keyboard amplifiers often have a simple onboard mixer, so that keyboardists can control the tone and level of several keyboards. Acoustic amplifiers are designed specifically to produce a clean, transparent, acoustic sound when used with acoustic instruments with built in transducer pickups and microphones.

Some well known brands of guitar amplifiers

While there are almost innumerable manufacturers of guitar amplifiers, we will be discussing the most important brands that have created history in guitar amplification.

Carvin Corporation

The Carvin Corporation is a musical instrument and equipment manufacturer, located in San Diego, California, well known among guitar players for their guitars. Carvin was founded in 1946 by Lowell Kiesel, and originally manufactured guitar pickups. Carvin Corporation manufactures acoustic and electric guitars, bass guitars and accessories, amplifiers, live studio sound equipments, microphones and lighting gears.

Korg Corporation

Korg Corporation is a Japanese multinational corporation that manufactures electronic musical instruments and guitar tuners. The company is one of the most widely used and respected names in the electronic music world. Founded in 1962 in Japan by Tsutomu Kato and Tadashi Osanai, Korg was originally known as Keio Electronic Laboratories because its fledgling offices were located near the Keio train line in Tokyo and Keio can be formed by combining the first letters of Kato and Osanai. Yamaha Corporation has always been a major partner of Korg, supplying them with circuitry and mechanical parts.

Marshall Amplification

Marshall Amplification is a British company which designs and manufactures electric guitar amplifiers. Marshall Amplifiers are well known and highly popular among guitarists. Marshall Amplifiers were originally built as direct copies of Fender amplifiers, but soon incorporated certain traits which made them more favorable to guitarists seeking a heavier sound. Like most professional level amplifiers, Marshall amplifiers still use valve preamp and power amplifier stages instead of solid state devices. Marshall also manufactures cheaper solid-state or hybrid devices.

Vox

Vox is a musical equipment manufacturer, which is most famous for making the AC30 guitar amplifier and the Vox electric organ. Founded in Great Britain, Vox is now owned by the Japanese electronics firm Korg. In 1959, with sales under pressure from the more powerful Fender Twin and from The Shadows, who requested amplifiers with more power, Vox produced what was essentially a double powered AC15 and named it the AC30.

Roland Corporation

Roland Corporation is a Japanese manufacturer of electronic musical instruments, electronic equipment and software. It was founded by Ikutaro Kakehashi in Osaka on April 18, 1972 with 33 million yen in capital. Some of the recent amplifiers from Roland Corporation are Roland SH 201, Roland Juno G, Roland MV 8800 and Roland V Synth GT.
Victor Epand is an expert consultant for guitars, drums, and synthesizers. You can find the best marketplace for guitars, drums, and synthesizers at these 3 sites: guitars, guitar amplifiers, drums, drum sets, drum kits, and synthesizers, keyboards.

Article Source: http://EzineArticles.com/?expert=Victor_Epand

Monday, 2 November 2009

Mesa Boogie Roadster Tube Amplifier Review

If you want to crank up the volume and play as flawlessly as guitar pros such as the notable music icons Carlos Santana, Metallica, Radiohead, Nirvana, and tons more, where else should you turn to but Mesa Boogie for all your amplifier desires? Mesa Boogie has been in the business of producing top of the line amplifiers for outstanding sounds and music making since 1971. Mesa Boogie is recognized for its excellent products sold worldwide, and the company is known all over the United States as one of the best in its trade. Mesa Boogie is also admired for its line of Rectifier Series amps, Mark Series, Lone Star Series, and more.

Guitar lovers of the world, unite! If you have the passion for guitar playing unlike any other, then you probably already know how essential the right amplifier is for your performance. Introducing another amazing feat offered by Mesa Boogie, one of the most sought after brands for amps in the country for more than 30 years.

If you haven't found the right amp to boost your performance and take it to the professional level, then meet the Dual Rectifier Roadster from the Rectifier Series of Mesa Boogie. The Mesa Boogie Dual Recto Roadster is one of the company's proudest brainchildren ever, and is available in two combo formats: 1x12 and 2x12 or the mighty Head version. Both of the combos are fan cooled, with V30 speakers and dimensions of 26 ¾ inches in width. You get the Rectifier amp with four casters for easier transport and added convenience. The smooth and clean black finish is attractive enough, but wait till you hear the sounds from this amp.

In general, what features can you expect from this Mesa Boogie Roadster Tube Amplifier from this Rectifier Series? You can switch the toggle form Channel 1 to Channel 2, which are the lower gain channels. You get to choose from modes of Clean, Fat, Brit, or Tweed. Switching on over to Channels 3 and 4, you have three modes, Raw, Vintage High Gain, or Modern High Gain, which are reminiscent of the Dual Rectifier Solo Head amps. Furthermore, each of these four channels have unique channel strips found on the rear panel, so you can control the Reverb, Power, Effects, as well as the Rectification individually per channel.

Another notable feature form the Mesa Boogie Roadster is the multi-watt function. This allows you to assign or choose wattage for each channel on your amp. You may select form 50 or 100 watts per preamp channel. The 50 watt power assignment gives your guitar playing an elasticity to it, while 100 watts is more preferable for sounds requiring a low-end girth. You can test the Roadster out for yourself and determine which settings are best to your application.
Charlie is the owner of Gear-Vault a Used Music Equipment online auction site. And Gear-Monkey Musicians online Talk forum. Both sites reflect his love for music and geared toward the music community.

Article Source: http://EzineArticles.com/?expert=Charlie_Beers

Friday, 23 October 2009

Tube, Valve amp for Guitar

For decades, it's been a general opinion that tube (or valve) amplifiers sound better than solid state amps.

First of all - what is a tube amp? A tube amp is a type of guitar amplifier that operates on valves (or vacuum tubes) instead of transistors. The sound you get from a tube amp is warmer and fuller that what you'd get from a solid state amp.

Valve amplifiers range from a few hundred dollars to a few thousand dollars, so the choice is really confusing! If you're reading this article, you've probably decided that it's time that you want to crank your volume past the 10 mark on your current practice amp or the tone just isn't satisfying you anymore.

There are a few things you have to know in order to make your decision. First of all, the type of music that you play, so that you can decide on the amount of gain that your amp needs to have. What is gain? Gain is basically a synonym for distortion. If you play mostly "clean" music (virtually, no amount of distortion), you won't need a lot of gain. If the music you play is blues or rock, you'll need a mild amount of gain, depending on how distorted you want the sound to be. If you play metal, you'll need a high-gain tube amp.

The most notable clean amp of all tube amp history is the Fender Bassman, the holy-grail of clean sounds. Generally, you'll want to look at Fender and Vox. Most tube amps have the amount of gain necessary for blues or rock (Marshalls, the expensive Buddas, the budget Blackhearts). Finally, if we're talking metal, you're going to want to look at Peavey, Mesa Boogie, ENGL.

The second aspect of a tube amp, why many people crave them, is the dynamic. Dynamic is the ability of the tube amp to sound clean when you're hitting the strings softly, and distorted when you're hitting them hard. This allows a great amount of expression. You're going to have to listen to an amp to see if it has this quality.

You'll also have to listen for definition, which is the ability to amplify every single note your play clearly. This is very important, otherwise you'll sound all muddy. The best way to test this is to play some chords, even fewer amps possess this quality.

Lastly, you'll just have to listen if it possesses the basic tonal characteristics that fit you. If the basic sound of the amp is bad, it will sound bad anyway you will adjust the equalizer, amount of gain, anything. It's not uncommon that you find bad tube amps made by prestigious brands. There's no such thing as "not knowing" if it sounds good or not, and although store employees can help you with various information such as amounts of gain, number of tubes, etc. they always want to convince you to buy the products you're trying. If you don't buy it, you can always come back another time and try it again, but if you do, you'll just lack motivation and it will harm your playing. This is important because tube amps aren't as cheap as a practice amp. Always try before you buy!
My name is Andrei Popa, and I've been playing electric guitar for 6 years now. I've bought and sold a lot of gear over the years, filtered all the guitar playing information I've received and have generally been through a lot of trial and error. I maintain a gear reviews website at http://guitar-gear-demos.blogspot.com