Even if you have a good reason, adding a tube or tubes to any amp
seems to me to invite problems.
1. The PA anode Z changes possibly needing adjustments to the pi
network, maybe coil taps moved and/or different range for C1?
2. The plate blocking caps may not handle the added circulating
current--ditto for the fixed load caps and bandswitch wafer that
switches them in.
you have the plate choke, input network, aforementioned power
supply--doubling the power of an amp means almost building up a new
amp.
rob
k5uj
>> You've gotta' really want to add the 2nd tube for a good reason. The 77Dx
>> is already capable of 2500w+ output power.
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