Drake TR4-c Help
On May 23, 7:07*am, Radio Vintage wrote:
HALLO GOOD Morning to All
TR4-C * IN RX MODE
When I'am go * with the switch , from SSB
to X-CW or X-AM *of TR4-C the indicator S-Meter and
Plate Ampers go to full scale and not return to 0,
I'am to be put the TR4-c in Power Off and workoff any minutes and
Power-on the indicator remain normaly to 0.
Or to put the TR4-c in x-CW or x-AM , I'am Power-ON is all OK.
The Problem is when the indicator is POWER-ON *and *I'm *switch from
ssb to x-cw or x-am .
I have observed that the Relays (k1 of circuit of tube 6ev7) it does
not return in Position of relax , but remains excited.
Help Me
Thank You
Frank
I believe the trouble is in the T/R circuit of the 6EV7 tube.. Check
the tube first ,then notice that there are several High Ohm resistors
associated with this circuit,like I megohm and higher.These high ohm
resistors will age and increase in value almost to an open
condition.Change ALL of these.This is a frequent problem with Drake
s.. GL Harold W4PQW
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