[TMC] PAL-350 Trouble

[Richard Knoppow]

    I would be interested in hearing more about the GPR-90 and 
whatever further developments there were. An underrated receiver 
IMO.

On 8/5/2018 8:23 AM, JF Samuels - K2CIB wrote:
> With your credentials I am sure you will solve it soon.  I agree 
> that it is best to ask if others have encountered the same 
> problems before delving in too deep.  It does seem to be in the 
> output section rather than the drive.  Do you have a spectrum 
> analyzer? They could be doubling.  I use a bird meter for power 
> output to a 51 ohm load, "T" pick off and an IFR 1200S to look at 
> the signal.  If it was a neutralization problem, it could be 
> creating power at a frequency not handled by the current output 
> network and dissipating it in the coils. It might be worth 
> bypassing the screen grids with external caps.
> 
> During my short career at TMC I worked on that amp, the GPT-750 
> and larger ones, receivers, audio equipment, the PMO (I built the 
> test/adjustment device for it), and worked with the engineers on 
> designing a follow-on to the GPR-90.
> 
> Good luck!
> 
> 73, John


-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL