[robm321]

My Melos went out in one channel. The left channel works fine. I can hear very subtle tube hiss barely out of the right channel but no sound. I switched tubes and the tubes are good, tried the cables and all other components.

What should I check next?

 

[nikongod]

what are the voltages around the amp?

B+should be about 100-110V in a normal melos
Plate should be about 60-70V

If those are right, the rest of this should be too:
Cathodes and grids should both be at +25 to 30V (HIGHLY variable, but around there)

anyways, if those numbers dont measure up well, check out the jfet which serves as the "tail" of the long-tail-pair (closer to the front edge of the board). if it blows (and the newbies tell us SS is more reliable than tube, it should never fail...) the audio section is hopeless. the source should be about 1.2V above ground, gate at ground, and drain at about +30V.

 

[robm321]

Thanks nikongod. I'll check all that when I get some time and post back.