Run the valves too cold (Over-biased) – This means that there isn’t enough voltage being provided to the power amp valve which will give you a thin, sterile sound without any of that lovely warm tube saturation.So if you don’t bias your amp correctly you’ll face the following scenarios: This means you can get the best possible tone out of them because the tubes are being fed the correct voltage according to the valves resistance.Ĭorrectly biasing your amp will mean one set of valves can have incredibly long life because they’re running at the perfect ‘temperature’. In absolute layman’s terms, having the correct tube amp bias will ensure that your power amp valves run at their optimum. Voltage capacitors retain their charge which can be very dangerous! So why is Tube Amp Bias important? Even if the amp is switched off or has been off for a few days. There’s a lot of charge stored in a tube amp and just touching the wrong part of the amp CAN KILL YOU ?. This should only be done by a trained amp tech. Please note: We do NOT recommend that you attempt to bias your own amp. Typical power amp valves are E元4, EL84, 6V6 and 6L6GC valves. It’s also worth noting that when talking about tube amp bias, only the power amp valves are in question. But, it’s worth having a basic understanding so that the next time you pop into the store and your sales assistant explains that the Mesa Boogie Mark V is a fixed bias amp and the Fender Hot Rod Deluxe isn’t, you won’t be completely in the dark. This is because adjusting the bias on a tube amp can be very dangerous if not done by a professional. The guitar community seems to be shrouded in the mystery that is tube amp bias and in a way, it’s probably for the best. When you need to have a tube amp biased.How tube amp bias will affect your guitar amp tone.It ensures the tubes are fed the correct voltage according the valves resistance rating. Beyond that, you really need to know what you're doing.Tube Amp Bias is an electronic process that ensures the power amp tubes in your valve amp run at their optimimum capacity so that you can get the best possible guitar tone out of them. I WILL say that subbing a 5751 for a 12AX7 is fine, as it's the most-common gain-lowering tube.
#DO YOU HAVE TO BIAS GUITAR AMP PREAMP TUBES HOW TO#
I'm not going to list each tube with high current draw because you need to know how to locate the data, know/understand the transformer specs and calculate TOTAL draw of all tubes before making substitutions. If the amp is running right on the edge of maximum current draw and you decide to lower gain by using a 12AT7 in place of a 12AX7 it's possible to overheat and blow your PT and/or cause other problems. For example, 12AT7's draw over twice the current of 12AX7's. You HAVE to be knowledgable of current draw to swap preamp tubes (or any tubes!). Take it to a qualified tech for guidance (and expect to pay a nominal fee - it would only be fair). If you don't have some kind of background in electronics and know your power transformer's capabilities (and the current draw of ALL the tubes in your amp)you can't just swap tubes around as I think is implied by posting the chart in the previous post. Random tube swapping for gain reasons is a VERY bad idea. Gives the whole thing a great vibe and attitude.Īnybody interested in sharing? I'm always curious to see if I can get anything more out of my amp. 6: (phase inverter): Mullard CV4024 - this tube is fantastic. 5: (tremolo): JJECC83 - just to run the tremolo, even though I don't use the tremolo on the amp I think that my Voodoo Labs 4-knob tremolo pedal is better. 4: (2nd gain stage for channel 2 and reverb recovery): RFT ECC83/12AX7 - thickens the tone of the amp a bit and darkens it a bit as well, thus taking out any harshness the overdrive on these tubes is fantastic-sort of Marshall-like smooth. 3: (reverb driver): Mullard ECC81/12AT7 - makes the reverb sound great, just like this tube is supposed to They sound very "direct" to me (I'm not exactly sure what that means or how best to describe it) and are good in the mids and bass, while the treble is not harsh. 2): Tungsram ECC83/12AX7 - I really like these tubes. 1: (1st gain stage for channel 1): vacant - I don't use the normal channel, and I like the extra gain the vacant spot lends to channel 2. Mine is a 65 DRRI (which I realize is not the same as those of you who have vintage Deluxes from the Golden Age, but nonetheless.) And since it's TDPRI, let's all presuppose that we're playing telecasters through them Please list the valve slot, what you use there, and why you like it (or what you don't like about it). I am writing -out of curiosity- to see what sorts of preamp tubes folks use in their Fender Deluxe or Deluxe Reverb amps.
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