Drake TR4-c Help
 

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

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