12/15/2023 0 Comments Vox vt20x tube replacement![]() ![]() In addition to this clever circuitry, VTX amplifiers feature a tightly sealed cabinet and a proprietary bass-reflex designed to deliver stunning resonance. This preamp design incorporates authentic analog circuitry to achieve the subtle tonal adjustments and capture the nuances that are distinctive of vacuum tube amps. These new amplifiers also feature a multi-stage Valvetronix tube preamp. The sensible engineering approach is to achieve the tone you want with potentiometers (gain controls), or by varying other parts of the circuit design, rather than by randomly swapping tubes and hoping by accident to find one you like.The VT20X features a brand new modeling engine and sounds even better than ever! By using VET (Virtual Element Technology), which is based on an analysis of the components and amp circuits themselves, VTX amplifiers produce the most accurate and realistic amplifier sounds to date. The mistake is to then attribute that change to the brand name, and assume that all brand X tubes sound like this, and all brand Y tubes sound like that. So far, so good we have heard a change in sound triggered by an entirely random change in tube parameters. If you happen to plug in two tubes (both of the same nominal type, say 12AX7), one of which has a mu on the low end of the manufacturing spread, one with a mu at the high end, you will hear more gain and (in a guitar circuit) maybe more distortion from the high mu one. Tubes have parameter spreads, factory production variations that all manufactured products have. Utter, complete, ridiculous, absurd, nonsense.Īs for different sounds when "tube rolling", they may exist, and yet have no useful significance. ![]() The equivalent of reading sheep-entrails to predict the future. The majority of audio-related information on the 'Net is complete nonsense. Be sure to research who actually manufactures the brands you are considering.Ĭlick to expand.Be cautious what you believe. and are reputable suppliers.ĭon't expect incredible differences, but I have found audible improvements using modern production tubes priced at reasonable levels. Is it creamy or is it luscious? Fat? Warm but bright? Round yet crisp? ![]() And just like everything else guitar amp related, lots of words with vague meanings. Some tubes will be quieter, some will distort when pushed less hard, and others will remain clean even when pushed pretty hard.īe aware there is a high level of cork sniffery involved in tube amps! Lots of snobbery for different brands, different eras, different amp topologies, etc. You shouldn't smoke the amp, but I would advise you to visit some Vox amp forums and ask about particular tubes you want to swap in if they aren't 12AX7. Your amp can probably operate using different flavors, though it isn't guaranteed. There are also different flavors of the tubes. It is a long time since I've looked at it in detail, so I'd advise you to internet search different brands "Who makes JJ Tubes", "Who makes Ruby Tubes", etc etc. There are several different manufacturers of compatible preamp tubes, but many different labels put on them. I've had the same result swapping the 12ax7 tube in an ART-TUBE preamp, where the cheap oem tubes sounded a bit harsh but swapping in a different tube helped it sound a lot nicer. Yes, there is a difference in tone between different brands of tubes. If I understand correctly, you may be able to drive your 12ax7 into true tube distortion, whereas my amp won't do that.Īnyhow, I have tried swapping out different tubes including preamp tubes. What you've got is that 12ax7 tube preamp running into a solid state power amp. There isn't any tube distortion from my preamp, but if driven loud then the output tubes will distort. If I use the clean channels it is a simple 12ax7 preamp feeding into a 6V6 two-tube power stage. The SCXD has a digital effects front end which feeds into a simple all-tube amplifier. I have a Fender Super Champ XD, which is a similar idea vaguely to your Vox amp.
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