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Old 13th October 2012, 11:12 AM   #11
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Ok I've made some progress.. I've had a reply from the manufacturer:

"First test headphone, if only 1 channel have sound, this problem is one TDA2030 breakdown.
other problem please see the attachment delay circuit diagram."

I tested the headphone socket, which to be honest I hadn't thought to do... and I have just the right headphone playing music, whilst the left just hums. So this must narrow down the problem to TDA2030.... but whats this and what does it mean?

They also sent me a circuit diagram of the delay circuit if it helps at all.
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Old 13th October 2012, 10:32 PM   #12
M Gregg is offline M Gregg  United Kingdom
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The TDA 2030,

Is a chip amp see this link for an idea:

http://www.itisff.it/dip_eln/tda2030.pdf

So you need to do a test to see if you can get a hum from a test lead when connected to the volume control.

If you connect a meter lead to the center tap of the volume control for the left and right channel you should get a hum this would tell you if the power section is faulty. if you dont get a hum then the fault could be one of the TDA2030 chips. Or the power supply to the chip amp for that channel.

So first does the chip amp work for the faulty channel.
If not is there a power supply to that amp? if yes then test to see if you get a hum if you connect a meter lead to the input of that channel amp.
If no hum from that channel then it could be the chip amp.
If you get a hum its in the pre section and the TDA2030 is OK.

You need to do these tests first..

Watch out for the B+ high voltage for the tube section..if you don't know what I'm talking about get an engineer to test it!

Regards
M. Gregg
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Last edited by M Gregg; 13th October 2012 at 10:39 PM.
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