That’s easy enough to fix.  You put a power control pot (2 terminals only) between the +5V and the bias pot(s).  You set the power control to maximum and adjust each bias pot(s) for for the proper current draw.  Now you can turn down the bias / power, as you please.  But you can’t turn it up past “full”.

Clark Martin

KK6ISP

On Jan 1, 2018, at 11:54 AM, John Seager <jseager2009@...> wrote:

Arv, a) Happy New Year. b) Aside from using an attenuator, drive is controlled by

the preset RV1. This could be replaced by a variable pot., perhaps on the back panel. 

However I think it was Farhan who pointed out a long time ago that the only problem

with this is the temptation to keep turning it up!  73,  John  G0UCP