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Old 17th March 2011, 09:38 AM   #1
sajti is offline sajti  Hungary
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Default 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
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Old 17th March 2011, 09:39 AM   #2
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Originally Posted by sajti View Post
I'm workign to build a new hybrid amplifier with tube input stage...
wow!
please show!
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Old 17th March 2011, 09:42 AM   #3
sajti is offline sajti  Hungary
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The schematic of the output stage, with the protection.

Sajti
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Old 17th March 2011, 09:44 AM   #4
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Quote:
Originally Posted by sajti View Post
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.
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Old 17th March 2011, 09:47 AM   #5
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regards, Pawel
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Old 17th March 2011, 09:50 AM   #6
sajti is offline sajti  Hungary
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Originally Posted by VladimirK View Post
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
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Old 17th March 2011, 09:51 AM   #7
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Aikido or White follower at the input?
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Old 17th March 2011, 09:54 AM   #8
sajti is offline sajti  Hungary
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Originally Posted by padamiecki View Post
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
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Old 17th March 2011, 10:02 AM   #9
sajti is offline sajti  Hungary
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The PCB with some emitter resistors.

Sajti
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Old 17th March 2011, 10:04 AM   #10
sajti is offline sajti  Hungary
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The heatsink with the mounted output devices, drivers, and Vbe multiplier.

Sajti
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