To All,

I have recently picked up a Trio W-50 Stereo AM/FM/SW receiver/amplifier.
It is a nice looking clean unit, but came with 4 bad 7189 output tubes. I
checked all the other tubes in this baby and all checked good, so I picked
up 4 new 7189A's to put in.

When I fired it up without the 4 tubes, I used a variac and brought it up
slowly to 110 AC to make sure I wasn't going to inadvertently let all the
smoke out and there appeared to be no problems. So far so good.

I then put in a 3 amp fuse (replacing the stock 4 amp) and added the
7189A's and a speaker on the left channel and again used the variac.

The speaker was silent and within a few minutes, the fuse blew. I never
saw a serious current load on the variac, but then, I wasn't watching that
closely. I double checked all the tubes at this point, and they all still
checked good (using a Hickok 600A tube tester).

So the question is, does anyone know of a source for a service manual for
this unit?

Regards,

John C.