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sajti 17th March 2011 09:38 AM

My new hybrid amplifier
 
I'm workign to build a new hybrid amplifier with tube input stage, and ss buffer. The estimated output power is 300W/4ohms, and the output buffer design based on Marantz PM11S1 output stage. But my version use more and different output devices.
The voltage gain of the buffer is 3. Simulated distortion is 0.003% at 300W output power.
The input stage based on single 6H30P for both channels. Voltage gain is approx. 6.

Sajti

padamiecki 17th March 2011 09:39 AM

Quote:

Originally Posted by sajti (Post 2506675)
I'm workign to build a new hybrid amplifier with tube input stage...

wow!
please show!

sajti 17th March 2011 09:42 AM

1 Attachment(s)
The schematic of the output stage, with the protection.

Sajti

VladimirK 17th March 2011 09:44 AM

Quote:

Originally Posted by sajti (Post 2506675)
I'm workign to build a new hybrid amplifier with tube input stage, and ss buffer. The estimated output power is 300W/4ohms, and the output buffer design based on Marantz PM11S1 output stage. But my version use more and different output devices.
The voltage gain of the buffer is 3. Simulated distortion is 0.003% at 300W output power.
The input stage based on single 6H30P for both channels. Voltage gain is approx. 6.
Sajti

If that buffer is push-pull and includes several stages, emloying tube input stage will insignificantly improve the final sound, it is already determined by the buffer, IMHO.

padamiecki 17th March 2011 09:47 AM

:yummy:

sajti 17th March 2011 09:50 AM

Quote:

Originally Posted by VladimirK (Post 2506682)
If that buffer is push-pull and includes several stages, emloying tube input stage will insignificantly improve the final sound, it is already determined by the buffer, IMHO.

Hi,

yes it can be. I want to try.
The THD of the output stage is 100 times lower than the THD of the tube driver stage. And the distortion mainly 2nd harmonic.

Sajti

padamiecki 17th March 2011 09:51 AM

Aikido or White follower at the input?

sajti 17th March 2011 09:54 AM

Quote:

Originally Posted by padamiecki (Post 2506691)
Aikido or White follower at the input?

You can use any of them, but not necessary. The input impedance of the buffer is 100kohms, with only few pF input capacitance. I plan to use simple common cathode stage.

Sajti

sajti 17th March 2011 10:02 AM

1 Attachment(s)
The PCB with some emitter resistors.

Sajti

sajti 17th March 2011 10:04 AM

1 Attachment(s)
The heatsink with the mounted output devices, drivers, and Vbe multiplier.

Sajti


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