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Old 1st February 2014, 10:17 AM   #1
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GIBRID TELEFONE AMP.
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Last edited by FEDOSOFF; 1st February 2014 at 10:29 AM.
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Old 1st February 2014, 10:38 AM   #2
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VIDEO ????????? ????????? ??? ????????? - YouTube
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Old 1st February 2014, 11:29 AM   #3
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In English: Hybrid headphone amplifier with 6S19P power triodes, and mosfet current source. If it can be made working, an excellent idea. Except the 5532 as input.....
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Old 1st February 2014, 01:19 PM   #4
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Originally Posted by dragonweed View Post
In English: Hybrid headphone amplifier with 6S19P power triodes, and mosfet current source. If it can be made working, an excellent idea. Except the 5532 as input.....
????????? ????????? ??? ????????? - YouTube
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Old 2nd February 2014, 01:57 PM   #5
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Cool circuit. Somewhat reminiscent of the Musical Fidelity X-Can V1. And absolutely nothing wrong with the 5532 here, it loves inverting operation.

I'd suggest R3 (10k) --> 0R. A 16 mV (typ) DC offset should be bearable, and noise would go down by about 3 dB (from -92 dBV to -95 dBV). Option B: 10k || 10-22 µF.

Is the circuit truly stable like that? Even with a load of 10 nF on the output? It may need 22-100 pF of feedback capacitance on the 5532, or something like a 100R-100n RC Zobel on the output.

Ia = 113 mA on tubes specified for 120 mA? Hmm. Even robust Russian technology has its limits.

A mains filter with common-mode choke and DC blocker - fancy.

The casing style is quite individual as well - rather art déco.

Any RMAA measurements? Though I guess as long as the circuit works properly, it would measure just fine.
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