"COLIN LAMB" ) writes:
Hi Jeep:

I am responding from a dark hole - guessing. A shot in the dark, so to
speak.

I am guessing that the 6CL6 was converted to a class A stage for use with
the ssb adapter. The basis for this is my vague recollection from an early
Single Side Band ARRL publication by Father Morrison, who was a teacher of
one of my friends. He converted a Viking II for use with a Central
Electronics 10A sideband rig and basically did the same thing to a driver
stage (maybe a 6AQ5), using it as a class A stage.

But I thought a lot of those things had enough oomph to drive the output
stage directly.

The 10A was classified as an exciter, and the schematic in the CQ SSB book
shows a 6AG7 in the output of the 10B (and the ad in the back says it's good
for 10watts). The SB-10 adaptor schematic in the same book has a 6BQ5, and
the text even says you'd basically break the connection between the driver
and the output stage, and connect the adapter there.

Given that these have actual output stages that use driver type tubes,
I would have thought it was simpler to just drive the output stage directly.

Michael VE2BVW

k

The 10 uses a single 6AG7 in the output. I recall tht the 6AG7 has 11 watts
plate dissipation and the stage runs class A. Class A runs about 33%
efficiency - and the circuit is poorly laid out and resistors are across the
coils to prevent parasitics. I measured 3 watts output with my 10A.

Although the power output ought to be able to drive a pair of 6146 tubes, I
do not think that was the way they did it.

Hopefully the manual for the adapter will answer the question.

73, Colin K7FM