[Amps] L4B biasing

[MU 4CX250B]

Mike, it's hard to answer your question without knowing a few more
details. Do you operate much CW, or mostly SSB?  Also, have you
thought about modifying the RF deck to use electronic T/R switching,
rather than the stock clunky relays? Do you want to operate QSK?

If you basically just operate SSB and don't mind dissipating 500+
Watts of heat with the 200mA of idle current, then no bias is needed.
It's so easy to add a few volts of bias and have everything run
cooler, however, that's what I'd be inclined to do. One of the great
things about the L4B is that everything is accessible and easy to work
on.
73,
Jim w8zr

Sent from my iPhone

> On Dec 24, 2014, at 1:52 PM, mike via Amps <amps at contesting.com> wrote:
>
> I just finished me Drake power supply. I used a Drake transformer and a doubler board with 8 caps. I have 2600 volts showing on the high voltage meter. I have eliminated all the bias circuit in the power supply that Drake used. At idle I show  200 mills of plate current. My question is should I add a bias circuit? I purchased a W4ZT board but wonder if I need it. Thanks and Happy Holidays to all.
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