Kevin -
Lee has a couple of good possibilities, but first try swapping V4 with
V6 and see if it makes a difference. The 6EJ7 at V4 has a reputation
for getting noisy, and you might have to try a couple three 'new' ones
to find a quiet one. Once you find one however, it should last for years.
A noisy tube is less of a problem at V6 or even at V2.
If no luck here, the next most likely suspects are C62 and C63, but
you're talking scope and troubleshooting to isolate beyond that.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Kevin Nathan wrote:
Hi All,
I would like to draw on the wisdom of the group here. My R4-C seems
to be developing a sort of frying noise when I am listening. It is
really apparent on SSB but also now is getting worse on AM as well.
It does not seem to effect audio quality but is running competition at
times with the received signal. Does anyone have an idea what this
might be? Someone mentioned that there is a particular tube, perhaps
a 6EJ7, that gets gassy and can cause this. Any thoughts?
Thanks all and very 73.
Kevin :)
Amateur Radio: K7RX
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