2. analog
  3. 1431788990

HELP HELP - VENDETTA RESEARCH SCP2A FAULTY

I recently purchased a Vendetta Research SCP2a phono stage - before i go on I am 100% certain it was sold to me without any faults, and that it may have been something else that was the problem -
HOWEVER!!!
I have a major problem
I used a step down transformer as recommended by John Curl so that I could run it off UK voltage which is 230.
I got a great sound out of my right channel - as it happened I only wired the ground to the left channel.

I checked the fuses (1 Amp) - but to be sure I went and got some replacements and put them in.

Once back on again there was a very faint signal out of the left channel alone - I replaced the fuses with the originals - just in case - same thing.

I tried it this morning - absolutely no sound at all -
I got a decent step down transformer from Maplins so that there would be ample overload protection.

I have emailed John Curl and await a response - I have also furiously e-mailed a few audio electricians in the UK - does anyone have an idea what the problem may be?

Alternatively is there anyone you know who may be able to resolve this?

Thanks

Lohan
parrotbee
zd542
5,339 posts
 
Try the power supply for the right channel on the left. Also, check the cables going to the left channel. You may have accidentally reversed the IC's.
rcprince
2,830 posts
 
Agree with Zd, reversing the power supplies (or switching the interconnect channels) might help isolate the problem. I also will assume that you have plugged both channels' power supplies into your step down transformer.
lewm
6,770 posts
 
I am a little unclear about the recent history. You say you originally heard no problem with the right channel, only the left channel was without signal. And incidentally, you mention that only the L channel was grounded. When you replaced the fuses, did things get worse, in that you lost the R channel as well? It seems so, based on what you wrote.

Have you opened the chassis, at least to see by visual inspection whether there are any loose wires? The fact that only the L channel was grounded should be neither here nor there, because if you're talking about chassis to chassis grounding, the grounds are probably common to each channel. I don't think there is a problem with your transformer, because you would have heard nothing at all or something more catastrophic might have occurred, if the AC voltage coming out of your transformer is seriously off the mark. BUT do you perchance have an AC voltmeter with which you can check it?
More to discover