[steverw]

Hello,

I would appreciate any sort of help with a problem I have:

Some of the wires from the volume pot and the input selector switch have come loose at the point where they connect to the board. They are still partially connected, so I know where they go. My question is in how to handle these wires. There seems to be a nylon plastic tube inside the wire, with copper strands around it. But I can't tell if its actually a coax cable; is there a center conductor? If so, I can't see one. Or is the signal carried on the copper braid? If it's coax, should I connect the center conductor to the board? What should I do with the outer braid? Leave it floating? Tie the braids of the wire pairs together and leave them floating?

Does anyone have a schematic showing how the volume pot and input selector switch are wired up?

Details: a blue and and a green wire were soldered together and to a point on the top of the circuit board right near the corner nearest the volume pot. Just below this point, a solid white and a white/blackline are also connected together and to the board. Right now, the copper braid of each wire are still soldered together, but they have lifted from the board so much that I can't tell if the braid was connected or not

Thanks for help...
-steverw

 

[Budgie]

Suggestion- Do a forum search for Melos SHA and you will find the names of some owners of the same, then PM them to ask for help. Some of the guys here have done alot of work with the Melos, but they may not have seen your post.

 

[bozebuttons]

Pm carlo he should be able to help.

 

[steverw]

I re-soldered the wires, unit plays what is coming in, sort of. The left channel is louder than the right. Does anyone know if there is an adjustment I can make to the ALPS pot? (yes I switched tubes around, didn't make a difference). Or do I have to mess with the trim-pots on the board?

 

[aeberbach]

You might find some pictures of what you need at http://homepage.mac.com/aeberbach - I don't have the unit any more but there are some pictures there.

 

[carlo]

Hey Steve,

I don't know if you got my last email response since my server is screwy, there's a list of stuff to check. Sorry if there's delays in response by the way, I've been away from the computer lately.

Nothing you can adjust on the ALPS, just a stepped attenuator. Those trim pots are for bias and they may be the cause of the channel imbalance, to play it safe switch inputs first and verify that the problem follows. If not adjust those trim pots until you read the same voltage at both tube plates (4th pin going clockwise from the notch), should be 55v iirc.

good luck,
carlo.