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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: Need soem help :) posted by Penguin on April 3, 2015 at 15:13:50:
while you're waiting, may I ask if you know the previous history of the amplifiers, assuming you are not the original owner? All the gain comes from the input voltage amplifier stage, although a few dead output tubes on one side will be noticeable partly as a seeming loss of gain, because it compromises the ability to drive a low-Z load. But back to the input stage; it's a dual-differential cascode. There is an option to disable the cascoded triode (one of the 6SN7s) so as to reduce gain in order to drive a very efficient speaker. Maybe someone did that to one of your two monoblocks??? Just a shot in the dark. When you do go inside, I bet the solution will be obvious from your voltage measurements. Check also the RC coupling between the cascode and the driver stage.
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Follow Ups
- Ralph will help you out, but.. - Lew 08:50:12 04/05/15 (7)
- That is helpful - Penguin 10:21:35 04/05/15 (6)
- Did you want MY voltage measurements? - Lew 10:46:34 04/05/15 (5)
- I just need some pointers as to what is meaningful to measure - Penguin 07:37:16 04/06/15 (4)
- schematic - Ralph 09:29:00 04/06/15 (3)
- Thank you - Penguin 20:08:01 04/06/15 (2)
- Follow up? - Lew 08:58:59 04/15/15 (1)
- on the stack of things.... - Penguin 09:05:00 04/15/15 (0)
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