Bob,
All great info, thanks. I will get to VTVM out tonight
and poke around.
Thanks !
73
Gene K1NR
On Thu, 6 Dec 2012 09:15:10 -0800 (PST)
Bob Loving wrote:
> Hi, Gene (and all):
>
> I just went through a VOX problem with one of my TR-4Cs.
> The VOX dropout delay was too short for CW. A
Hi, Gene (and all):
I just went through a VOX problem with one of my TR-4Cs. The VOX dropout delay
was too short for CW. After close inspection of the two units, R135 was 33k, a
value used to set the cutoff bias for the 6FQ7/6CG7 even though I had a 6EV7 in
the rig. My other TR-4C, and a TR-4,
Hello Gene:
Glad it was not the relay. For tubes, unfortunately for the pocketbook,
the best test is to sub in a known good tube. Many times, even a good
tester, will indicate good and a different tube will work.
I would try the 6EV7 as that is what Drake used in the TR-4. I dont
have a C
All,
Update on the TR-4c relay issue. I did the pull test -
i.e. pulled the tube while the radio was hanging in
transmit. The relay immediately opened and radio went
back to receive. Seems that the relay is Ok.
Pulled the 6CG7 and placed it in the Hickok 6000 tester.
It tested as "goo
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