Hello,
Goes to show that the best "tube checker" is the actual circuit!
Best regards,
Paul Bigelow
EAC 1967 R-390a/URR Ser. No. 121
Collins 1951 R-392/URR Ser. No. 1254
"David Wise"
<David_Wise@Phoen To: <[email protected]>
ix.com> cc:
Sent by: r-390- Subject: RE: [R-390] RF IMD Problem SOLVED!
admin@mailman.
qth.net
09/03/2002 03:09
PM
> From: Philip B Atchley [mailto:[email protected]]
>
> NEXT, out of desperation I changed the RF amplifier, 6DC6
> tube with one
> borrowed from Dons Receiver. EUREKA!!! IMD totally gone AND
> the S meter
> moved from 80dB to fully pegged on my local station (as other R-390A's
> have done in the past)
>
> What I DON'T understand is this. These two tubes checked
> IDENTICALLY in
> the B& K emission tester, both checked IDENTICALLY for gain in my
> receiver at 21MHz. Neither test shorted or gassy! RF GAIN
I have no diagnosis for you, Phil, but I hope you
keep that tube around so others on the list can
play with it. I'd love to know what it's doing.
73,
Dave Wise
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