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Simple Hybrid tube amplifier with MOSFET output
Simple Hybrid tube amplifier with MOSFET output
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Old 11th July 2019, 04:22 AM   #31
flancfuster is offline flancfuster  Europe
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Working on output stage.
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Old 11th July 2019, 01:36 PM   #32
bandol83 is online now bandol83  France
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Hi flancfuster,

If you want to make your own PCB, I suggest you to use the version 5 HD which was modified with Hugh recommendations for the Mu-follower stage instead of the SRPP ! I didn't test it yet, but I had problem with the SRPP version

Rgds,
Marc
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File Type: pdf Schema Hybrid amplifier Rev.5HD.pdf (141.0 KB, 45 views)
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Old 11th July 2019, 11:07 PM   #33
e_fortier is offline e_fortier  Canada
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Simple Hybrid tube amplifier with MOSFET output
Very nice work Marc !!
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Old 11th July 2019, 11:08 PM   #34
flancfuster is offline flancfuster  Europe
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Marc on the schematic attached, 0.1uF couling caps are missing. I can see only 0.22uF. Are they required?

Quote:
Originally Posted by bandol83 View Post
Hi flancfuster,

If you want to make your own PCB, I suggest you to use the version 5 HD which was modified with Hugh recommendations for the Mu-follower stage instead of the SRPP ! I didn't test it yet, but I had problem with the SRPP version

Rgds,
Marc
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Last edited by flancfuster; 11th July 2019 at 11:12 PM.
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Old 13th July 2019, 09:29 AM   #35
kees52 is offline kees52  Netherlands
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Nice amp, I have done also with that current source however that is a tube, and I have the mosfets dc coupled to the tubes, that is possible with a dc servo and a pauze into the speaker protection, I set it on 1 minute so tubes are warm before switch on. I did not use feedback and I am not a fan of mosfet relais between speaker.
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Old 13th July 2019, 11:01 AM   #36
flancfuster is offline flancfuster  Europe
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DC coupled? I would like to try that. Can you share the schematic of your project?
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Originally Posted by kees52 View Post
Nice amp, I have done also with that current source however that is a tube, and I have the mosfets dc coupled to the tubes, that is possible with a dc servo and a pauze into the speaker protection, I set it on 1 minute so tubes are warm before switch on. I did not use feedback and I am not a fan of mosfet relais between speaker.
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Old 13th July 2019, 11:40 AM   #37
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by flancfuster View Post
DC coupled? I would like to try that. Can you share the schematic of your project?
Here is a schematic of a all plate follower, this one dit sound so open that I was suprised, (without feedback) when use a higher mu preamp tube you need to connect feedback.

search on mine name here I have more somewhere, I am on a other pc now, programming so I can not send.

regards
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Old 13th July 2019, 10:09 PM   #38
flancfuster is offline flancfuster  Europe
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Thanks, I'm looking on other threads started by you.

Quote:
Originally Posted by kees52 View Post
Here is a schematic of a all plate follower, this one dit sound so open that I was suprised, (without feedback) when use a higher mu preamp tube you need to connect feedback.

search on mine name here I have more somewhere, I am on a other pc now, programming so I can not send.

regards
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