![]() ![]() I swapped the speaker for a more sensitive one (db/W measured 1 metre from the cone) which also handled about double the power. Yes it was loud but not in a good way.Īdding a steep sloped high pass filter that cuts frequencies that are only sapping power (below the speaker/cab lower 3db point that are neither audible nor useful). Somewhere between 35 and 80Hz is usual dependant upon the cab design and speaker. It also protects the speaker from frequencies below the resonant frequency where the speaker "unloads" and flaps about wildly without having the resistance offered by the cab to restrain it.ĭrNomis wrote:I noticed that according to the schematic for my TKO 80 amp, the power amp section is a Quasi-Complementary type, and I was wondering how hard would it be to mod it to a Complementary type, it does have a +V and -V supply rail so it shouldn't be too hard, should it?. I would look for a more efficient speaker. You are not going to get much more volume out of it. All in all, it is a 'pro tool' type of control that each player can set to their own subjective taste.Not much in actual volume for the most part.another idea is. Most players find a 'sweet spot' about 2:30 - 3 o'clock on the control. It does not change the EQ directly but because the way the tube responds can be varied you will hear EQ differences at various settings. Technically it varies the electrical 'strength' of the tube and that affects gain, texture and dynamics. ![]() The Bias control also adds dynamics and allows you to custom match your Tube Driver for any particular pickup/amp combination. Just go up or down a few clicks and he nails what he wants. Eric Johnson used to spend a lot of time looking for perfect tubes to use in his standard Tube Drivers, but now he can just set the bias easily with the stock tube. The Bias control is very helpful as it adjusts the amount of current applied to the cathode of the tube. David Gilmour, Joe Satriani, Billy Gibbons and many other pros now use the Bias mod. ![]() Now he uses a Bias mod Tube Driver on stage. This saved him from sorting through literally hundreds of tubes to find the exact one he wanted. My solution was to install a 5th control that controls the tube cathode current and enables him to ‘dial in’ the tube characteristics he wanted. ![]() Years ago, Eric Johnson requested that I install an extra pot in some of his Tube Drivers to help him match the tube response to his super critical hands and ears. Mine has the 5th knob mod to control the tube cathode current. I have a Butler Tube Driver, here's the schematic: ![]()
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