Ted -
Yes, they do run warm. However, I would be suspicious of the filter capacitors C90B and C90C.
These caps are years past their Use by date, and while some are OK, most are not, exhibiting
either high ESR or high leakage currents. One other possibility is V7 being biased incorrectly.
Check the voltages on this tube, and if the cathode isn't around 4.5 V AND the cathode resistor R44
is around 120 ohms there may be some extra current going there. If the resistor IS at 120, but the
voltage is off, the 6EH5 may be gassy. This stage draws most of the B+ current in most receivers.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs
www.k4oah.com
Ted Schurter wrote:
I have noticed lately that the power transformer in my R4B is rather
warm. After about a 3 hour warm-up, one can still touch the top of it,
but just barely. I would guess the temperature to be around 50 degrees
C. I can't say that I have noticed it getting this warm in the past,
but maybe this is normal operation.
Can anyone with an R4B comment?
Thanks
WB2NVK
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