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Old 17th January 2013, 11:45 PM   #1
diyAudio Member
Join Date: Dec 2011
Default Leak st20

Hi, don't know if anyone can help on this, but I've just connected up a newly bought leak stereo 20 via a passive and installed all valves into there respective positions, and have very little output through my right speaker and a low level hum through both speakers?
All speaker/mains cables are in close proximity to each other, as its a temporary setup,could this be the problem with the hum/buzz through speakers? I've only just connected it all up tonight, can somebody offer some guidance on resolving this?
Many thanks
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Old 18th January 2013, 11:07 AM   #2
DF96 is offline DF96  England
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Join Date: May 2007
If you bought it from a dealer take it back. If you bought it as a private deal with no warranty then you need to find a circuit and start fault-tracing.
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Old 18th January 2013, 04:00 PM   #3
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Join Date: Dec 2011
Hi, I'm thinking its the new preamp that maybe causing the problem, could this be down to an earthing issue via one of the outputs to the leak or somthing more to do with the leak?
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Old 18th January 2013, 07:21 PM   #4
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
Could be grounding causing the hum. Try a few experiments with different sources.

The weak output on one channel is more likely to be a fault. Try swapping things between channels: cables, valves, speakers etc.
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Old 18th January 2013, 09:40 PM   #5
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Join Date: Sep 2003
Location: London
If you are truly interested in learning how to build valve amps you can't do much better than a Stereo 20 to experiment with. Get any edition of Morgan Jones "Valve Amps" and start learning. Morgan is very well versed in the Stereo 20 and this era of amps in general, and is an excellent guide.

You need to do a lot of reading before you start poking about inside valve amps, and make sure you read all the safety precautions before you start. You will need a good multimeter and to know how to use it - this includes "one hand behind your back" when testing or anything with power on.

Then download the circuit diagram and study it carefully - you will be wanting to test the voltages at certain points so you need to see what the circuit does. Even better would be to invite an electronics engineer to come over and help you look at it and give you some starting lessons. You may be able to locate some like minded enthusiasts in your area by means of ads on forums like this, or other forums like Audio Asylum and HiFi Wigwam DIY

The alternative is as said, take it back where you bought it. It may be faulty.
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