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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: RE: MP Engineering OTL posted by Kasanay on June 6, 2016 at 14:01:03:
Without referencing the schematic a second time, a capacitor between the input stage and the driver stage can correctly be called a "coupling capacitor", but when I said there was no output coupling capacitor, I was referring to the interface between the output tubes and the speaker. Thus you need to carefully adjust DC offset before hooking these to a speaker, which I think is why there is a meter placed into the circuit by activating that switch shown above the 3.3R resistor. Counterpoint SA4 and KSS both I think were Futterman designs with no coupling capacitor too. I think Counterpoint used some sort of servo mechanism to keep DC offset low or absent. But both of those amplifiers could occasionally cause problems.
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Follow Ups
- RE: MP Engineering OTL - Lew 14:38:45 06/06/16 (3)
- RE: MP Engineering OTL - Kasanay 14:57:18 06/06/16 (2)
- You might have to move some tubes around to get the DC balance - Ralph 11:43:59 06/07/16 (1)
- RE: You might have to move some tubes around to get the DC balance - Kasanay 12:16:53 06/07/16 (0)
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