[Drake] Transmitting Problem...

[Larry Taft]

Did you go through the alignment procedure and check the 
neutralization?  Sounds like there is a parasitic oscillation in the finals.

73, Larry  K2LT
drakerepair.com  800-687-9161

Rob Matherly wrote:
> Hi All;
>
> I just fixed the receive portion of my TR-3.  Now I appear to have a 
> problem with transmit.
>
> I let it warm up for about half an hour, then decided to try and work 
> someone.  After tuning up, I checked power output.  30 watts.  Then 
> 35.  Then 40.  I looked at the plate ammeter, and noticed my current 
> had gone up from .45 to .6 amps.
>
> I followed the tune-up procedure outlined in the manual, have proper 
> idle current, and SWR is 1.5:1.  I transmitted for no longer than five 
> or six seconds, and allowed an equal amount of time to cool down.
>
> I let it set for a minute or so, and the current on transmit (this is 
> just tune-up - no mike or key, just the function switch on X-CW) went 
> back to .45 amps.
>
> What could be the cause of this?
>