Circuit info needed for Hohner guitar amplifier model RW50RC

[3T39]

Hi, All!

I'm trying to fix this RW50RC Hohner Rockwood amplifier, The symptoms are no
signal, although the output stage is clearly working OK. I've done a google
but can't find circuit info, Any help appreciated. Thanks
Pete


E-mail: [email protected]

 

[Ron(UK)]

Hi, All!

I'm trying to fix this RW50RC Hohner Rockwood amplifier, The symptoms are no
signal, although the output stage is clearly working OK. I've done a google
but can't find circuit info, Any help appreciated. Thanks
Pete


E-mail: [email protected]

Check if there is an 'effects loop' usually a pair of jack sockets. It
might be that the contacts on one of the sockets is dirty. You can prove
it by inserting a short jack to jack lead between the two sockets

Ron

 

[PainintheAmp]

Is it a tube output?

 

[3T39]

Many thanks for those responses guys, It's appreciated,
Ron, There are seven jack sockets at the back of the unit, the usual
Headphone and Chorus and Reverb pedals the other four are marked - send-
return - line out - and overdrive pedal. Is it the send and return that you
mean? do I link them together? There is also a steel box on the bottom of
the cabinet with two phono sockets which connect to the main amp, I assume
this is the chorus unit?
PainintheAmp - No it's not tubes the output devices are just transistors a
2SD718 and a 2SB688
At the moment I have the whole thing dismantled for inspection and so far
I've found a couple of dry joints on a small panel marked rate- and -
depth, I'm hoping that this is the only problem as everything else looks OK
so far. But I can't test it properly till I've got it back together. I'll
let you know what I find.
Thanks again,
Pete

 

[Ron(UK)]

Many thanks for those responses guys, It's appreciated,
Ron, There are seven jack sockets at the back of the unit, the usual
Headphone and Chorus and Reverb pedals the other four are marked - send-
return - line out - and overdrive pedal. Is it the send and return that you
mean? do I link them together? There is also a steel box on the bottom of
the cabinet with two phono sockets which connect to the main amp, I assume
this is the chorus unit?
PainintheAmp - No it's not tubes the output devices are just transistors a
2SD718 and a 2SB688
At the moment I have the whole thing dismantled for inspection and so far
I've found a couple of dry joints on a small panel marked rate- and -
depth, I'm hoping that this is the only problem as everything else looks OK
so far. But I can't test it properly till I've got it back together. I'll
let you know what I find.
Thanks again,
Pete

Yes to the send/return sockets, when you insert a jack into one of the
sockets, it disconnects the pre-amp from the output stage, linking the
sockets together provides a signal path. It`s very common for the
swithing contacts on the jack sockets to give trouble.

The metal box in the bottom of the amp is the reverb spring tank.

Ron

 

[3T39]

Hello, Ron(UK)!
You wrote on Thu, 2 Jun 2005 09:30:20 +0000 (UTC):

RU> Yes to the send/return sockets, when you insert a jack into one of
RU> the sockets, it disconnects the pre-amp from the output stage, linking
RU> the sockets together provides a signal path. It`s very common for the
RU> swithing contacts on the jack sockets to give trouble.

RU> The metal box in the bottom of the amp is the reverb spring tank.


Thanks for that info Ron,
I appreciate you taking the time,
Regards,
Pete