Telefunken v676a - Strange Problem

[ralfw]

Hello everyone,

as I’m working on a Rack full of seven v672s I added a v676a, which is working fine in this Rack until I slide any of the v672s in. Then only the v676a start to pulsating. The Pre does still work than, but generate this strange pulsating noise. Does anyone have experience with this kind of problem and can help?

As a PSU I’m using a TAB N324.

Kind regards Ralf

 

[Rob Flinn]

Look up the total current draw of the modules compared to the PSU delivery capability.

 

[ralfw]

Look up the total current draw of the modules compared to the PSU delivery capability.

Hello and thank you Rob, the PSU delivers a maximum of 5,5 A +- 10%. From the service manuals I read that all of the v672s and the one v676a using a maximum of 0,7 A. That‘s why I’m pretty sure it shouldn’t be a problem.

 

[Rob Flinn]

Has the psu been serviced ?

 

[rock soderstrom]

Hello everyone,

as I’m working on a Rack full of seven v672s I added a v676a, which is working fine in this Rack until I slide any of the v672s in. Then only the v676a start to pulsating. The Pre does still work than, but generate this strange pulsating noise. Does anyone have experience with this kind of problem and can help?

As a PSU I’m using a TAB N324.

Kind regards Ralf

Maybe the pinout of the modules is slightly different and thus the modules do not like it to be connected to the same backplane?

 

[rock soderstrom]

I can not find a V672s, does it match to this model?
Last one is for the V676a