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Old 17th February 2013, 11:54 AM   #11
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OK ok ok...
Right after that I played non stop and the louder I could and it finally began to buzz, again...
Still too hot.
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Old 20th February 2013, 07:59 AM   #12
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Hi again to all.
I have tested different pair of the same transistor model which is 2SB324 and there is one that seems to work ok. Would it be possible that the same transistor type behaves differently in the same circuit (i guess so but...)
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Old 20th February 2013, 12:21 PM   #13
JMFahey is offline JMFahey  Argentina
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You amp is still way overbiased.
Using a green (or any colour) Led is even worse than using a Si diode.
Try a Germanium diode there .
Measure and post the voltage you have now across the 1 ohm emitter resistor and then what you have with the Germanium diode.
Always without signal.
Also the +V (power supply) voltage.
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Old 20th February 2013, 01:20 PM   #14
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Thanks a lot for this information.
I still don't have a germanium diode on hand. BUT could it be possible, for the purpose on the experimentation to use the base-emmitor connection of a germanium transistor?
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Old 20th February 2013, 02:14 PM   #15
JMFahey is offline JMFahey  Argentina
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Yes, it's possible.
Please measure and post, so we have some numbers to compare.
"Hot", "hum", etc. are only words.
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Old 28th April 2013, 12:22 PM   #16
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Hi all.

Sorry for the long time before answering.
So. I basically have not to explain the "hot" "hum" terms because, as soon as I replaced the silicon diode with the germanium one, the amp started to work absolutely perfectly. I did some tests before taking it to a 2-3h "jam" and it didn't run hot or anything else. It played well. and thanks to you.
did
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Old 28th April 2013, 12:43 PM   #17
JMFahey is offline JMFahey  Argentina
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Cool
Congratulations.
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