[Collins] Fwd: humm

[Dr. Gerald N. Johnson]

On Sat, 2009-04-11 at 10:08 -0400, drleborgne at aol.com wrote:
> Thank you all for the expert advice.I found the culprit: one of the PA"s 6146A? causes a 60 hrtz sine humm deteriorating audio. Seems to have a grid leak and a heater to cathode leak as Jerry suggested. I bought a replacement in Ebay
> 
> and will let you know the results of the smoke test.
> 
> Kind regards Martin.? (pd. the net works)
> 
When tubes are paralleled, most figure they ought to be matched for
gain, or at least idling current so they share the load equally.

-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer