Of course not. Impedance is finite, and for this tube in this mode has a value of approximately 500 kom.
I didn't have those tubes. The Handbook says they're identical. Probably the Soviet 6Zh1P is a clone of these tubes.
Here are the results of the noise in two channels
YouTube
Left channel noise = -62 dB (0.775v)
Right channel noise = -65 dB (0.775v)
The noise depends on the selection of tubes.
Output voltage level (1kHz) = 0.35V (at 5 mV input )
For the selection of tubes I have already made a special tester.
YouTube
Left channel noise = -62 dB (0.775v)
Right channel noise = -65 dB (0.775v)
The noise depends on the selection of tubes.
Output voltage level (1kHz) = 0.35V (at 5 mV input )
For the selection of tubes I have already made a special tester.
I think this is similar to a TRAFOMATIC phono stage that was reviewed at 6moons.
https://6moons.com/audioreviews/trafomatic11/schema1_big.png
https://6moons.com/audioreviews/trafomatic11/schema1_big.png
I believe this is not Trafomatic's circuit although they do manufacture it. The topology has been popular on various Russian sites for many years. My research at the time indicated the first incarnation belonged to Komissarov, but perhaps Zampotech knows better and will correct me.
My built used an EF86 and a 6N30P and i liked the simplicity. The regulated G2 is indeed a must. Gain was on the low side and distortion on the high: the concept of a variable anode load does not yield particularly low distortion. It sounded pretty good though.
Attached is Komissarov's circuit
Attachments
I would defer to you without protest!
The schematic I linked was part of a review in 6moons - and it was said this was not the exact circuit TRAFOMATIC used.
It does have an appealing look about it. I have never built it nor have I ever heard a phono amp using the topology.
I don't get out much ... !
The schematic I linked was part of a review in 6moons - and it was said this was not the exact circuit TRAFOMATIC used.
It does have an appealing look about it. I have never built it nor have I ever heard a phono amp using the topology.
I don't get out much ... !
This scheme is a continuation of the schematic of the phonopreamp T24 (2006)
Scheme Komisarova really popular on Russian websites.
The T15B scheme is more similar to the Komissarov scheme, though a different development path.
this method of correction has long been known. It was used in long-distance communication technology.
Scheme Komisarova really popular on Russian websites.
The T15B scheme is more similar to the Komissarov scheme, though a different development path.
this method of correction has long been known. It was used in long-distance communication technology.
Last edited:
Announcement for everyone.
If you wish to repeat this preamp, you can order printed circuit boards from the links:
Phonopreamp T15B PCB-A - Share Project - PCBWay
Phonopreamp T15B PCB-B - Share Project - PCBWay
Phonopreamp T15B PCB-C - Share Project - PCBWay
PCB-A this is the input connector Board
PCB-B this is the amplifier Board
PCB-C this is the power supply Board
The developer has allowed to keep the links open until April 28. Then the possibility of ordering will be closed.
Board design will be provided upon request.
If you wish to repeat this preamp, you can order printed circuit boards from the links:
Phonopreamp T15B PCB-A - Share Project - PCBWay
Phonopreamp T15B PCB-B - Share Project - PCBWay
Phonopreamp T15B PCB-C - Share Project - PCBWay
PCB-A this is the input connector Board
PCB-B this is the amplifier Board
PCB-C this is the power supply Board
The developer has allowed to keep the links open until April 28. Then the possibility of ordering will be closed.
Board design will be provided upon request.
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