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In Reply to: Biasing multiple EL84s posted by andy evans on August 27, 2002 at 08:30:45:
There's something of a manufacturer's compromise going on here too. A commercial amp has to be plug and play as far as the customer is concerned. You could set up the bias individually and supply carefully balanced valves, and maybe the client would put the valves in the right sockets as instructed, maybe not. Like wise when it comes to valve replacement, the customer may buy carefully selected and matched valves, maybe not - Either way you want the amp to work. So many amps will not have individual bias adjustments. Using regulators is another way to make biasing customer proof.
I've found that the more pairs of output valves there are paralleled up in an amp, the less matching matters. Individual characteristics of any one valve are 'averaged out' by the others, provided no one valve is grossly off spec.Regards,
Andy
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- Commercial compromise. - EL84 08/28/0200:48:10 08/28/02 (0)
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