Westinghouse H-138 Phono Jack Problems

11/30/2012 5:17:01 PMEdd

:I just recapped this am/shortwave console and it performs well. The only issue is when I plug in a phono or FM tuner in the jack on the back of the chassis, I cannot seem to get them to work. Also, the only way I can get reception is with the antenna wire connected directly to the tuning condensor itself, not the antenna attachments at the back of the chassis. I did not replace all the other capacitors, could they be causing these problems?

Sir Dave F. . . .

On the phono aspect, reference to the schematic and note that the phono input jack then feeds up and over to
Switch 2 rear wafer and its audio gets switched up to the very top terminal of the volume control.

Take ohmmeter in hand low ohms scale and see if there is low /zero ohms continuity from the input to the volume control.

If confirmed as open circuit. . . trace down the interconnecting wiring connection by connection.

Also, with old wiring, be sure that the shielding is not shorting out the initial phono signal input to ground.
As per the RF problem, with your antenna connection made right to the tuning condenser . . . its for sure that the signal is going
right on into the input grid of the 6SA7 mixer tube.

So,if it is not coming in from the normal antenna connection, seems like there is some open point in the multiples of series coils involved in that signal path.

Considering the RF portion of the tuning condenser initially connecting to the bottom connection of L3 antenna coil and passes thru it and comes out the top connection and then passes up to BC terminal board connections.

Then the flow is down to L7 loop (it is there and connected up ? )
and then the other end of L7 loop passes up and into L2 coil and thru it and over to the right to ground.

Ohm out all of that circuitous routing and also watch out for each connection.

73's de Edd

At my age . . . . . I'm still hot. It just comes in flashes.