Roberts 770x Mic and Line Inputs

[Siegfried Meier]

Hey guys!

I just acquired one of these in great shape. However, I only see signal on the phono inputs - not the mic or line. I have the machine record enabled. Perhaps there's some other setting I'm missing? I even bought new EF86 tubes thinking it was the problem, but still nothing...

Any help much appreciated!
Thanks,
Sig

[Siegfried Meier]

No one knows anything about these eh?

[Siegfried Meier]

Plllllleeeeaaasssseeeee!!!

[Matt C.]

Sounds like it could be an issue with the jacks or some associated switch/plug (maybe the 4-pin DIN plug). As far as I can tell all the inputs end up using the same basic circuitry but the line and mic inputs go through some switches and plugs to get there so that's where I'd start looking for a broken or dirty connection.

Also be careful of the high voltages inside!

[ec]

Not sure if you're still having this problem... But is it both channels, playing back audio through the phono inputs? (What happens when you put it into playback mode?) If the problem is duplicated on both L and R, I think it must be a switching issue, as the only parts shared by the two monoblock amps (at least for that) are mechanical.