[Elecraft] low pre-driver

[Robert Greenwalt]

Hi,

When doing the 40-Meter Transmitter Alignment, I couldn't keep the output
power in th 1-2 watt range.  Turning the power all the way up only got up to
.7 watts.  I checked the output across the dumy load and it was practically
non-existent (.007Vrms) though key-down was noticeably different than
key-up.

I walked through the Transmitter signal tracing.  Everything was within
tolerances until I got to the pre-driver output.  I expected about .132Vrms
but got .07 Vrms.

I've checked all the components in the pre-driver section up through T1 (not
sure where pre-driver ends and driver begins) and they all have the right
markings.  I verified T1 and reheated the connections.

On qth.net I only found references to high pre-driver issues.  Suggestions?

Transmit mixer output: .016 Vrms
Buffer output: .216 Vrms
Bandpass filter output: .035 Vrms
TR switch output: .033 Vrms

Predriver output: .072 Vrms (expected .13 )

Robert, K6RJG