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Old 4th June 2013, 01:38 AM   #5161
hotwind is offline hotwind  China
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Default Sharing a fun power-amp Schematic

Can use
6Dj8 sieris( ECC88,E88CC,CCa,E188CC,E288CC),ECC85 sieris,6BQ7 sieris, 12AX7 sieris( E283cc*, ECC808*```), 12AU7 sieris( ECC40*, E181CC, E80CC``` ), 12AT7 sieris ( E180CC, 6201```)
EL34 sieris( KT77```), KT88 sieris ( 6550```)
tubes.

M400S.jpg
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Old 6th June 2013, 05:47 AM   #5162
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Default 211 SE amp, with 10Y input/driver tube.

This my latest amp: 211 SE (20W) , all DHT tube. Input/driver tubes is 10Y/801A.
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Old 6th June 2013, 09:10 AM   #5163
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Quote:
This my latest amp: 211 SE (20W) , all DHT tube. Input/driver tubes is 10Y/801A.
Do you have a schematic? And are you happy with the sound?
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Old 6th June 2013, 01:50 PM   #5164
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Default 211 SE DHT AMPLIFIER

So far I am pretty happy with its sound even though it is not fully broken in. The circuit for these amps are so simple that I never bother to draw them. This full DHT is a pain because you need separate heater for each tube, and regulated heater too, for low hum.

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Do you have a schematic? And are you happy with the sound?
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Old 6th June 2013, 02:27 PM   #5165
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The circuit for these amps are so simple that I never bother to draw them.
I understand. But am curious as to cap coupled or interstage. Am planning an all interstage GM70 with 41PL->300B->GM70 and so yes, I'll also have to build three seperate heaters for each tube. (Coleman)
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Old 6th June 2013, 03:19 PM   #5166
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Quote:
Originally Posted by Unison845 View Post
This my latest amp: 211 SE (20W) , all DHT tube. Input/driver tubes is 10Y/801A.
I recognize your style! Your amps are fantastically beautiful!!

Are you going to bring that to Burning Amp this year?
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Old 6th June 2013, 07:02 PM   #5167
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Quote:
Originally Posted by Unison845 View Post
So far I am pretty happy with its sound even though it is not fully broken in. The circuit for these amps are so simple that I never bother to draw them. This full DHT is a pain because you need separate heater for each tube, and regulated heater too, for low hum.
Your build looks excellent. Great work.
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Old 6th June 2013, 10:44 PM   #5168
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Default 211 DHT SE amplifier

This amplifier started out with capacitor coupled design, but ended up with interstage. Basically the 10Y input tube directly coupled to the second 10Y driving an interstage transformer. The output of the interstage drives the 211 in fixed bias. The interstage is hidden under the amp, it was an afterthought.
My GM70 amplifier (picture in previous page used similar circuit but with a pentode strapped triode driving a 6B4G DHT.


Quote:
Originally Posted by Bas Horneman View Post
I understand. But am curious as to cap coupled or interstage. Am planning an all interstage GM70 with 41PL->300B->GM70 and so yes, I'll also have to build three seperate heaters for each tube. (Coleman)
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Last edited by Unison845; 6th June 2013 at 10:48 PM.
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Old 6th June 2013, 10:47 PM   #5169
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Default Burning amp 2013.

I dont know what I am going to bring to the BA 2013, by that time, I woukl have finished more exotic amp than this 211 SE.

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Originally Posted by 6L6 View Post
I recognize your style! Your amps are fantastically beautiful!!

Are you going to bring that to Burning Amp this year?
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Old 6th June 2013, 10:51 PM   #5170
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Quote:
Originally Posted by Unison845 View Post
This amplifier started out with capacitor coupled design, but ended up with interstage. Basically the 10Y input tube directly coupled to the second 10Y driving an interstage transformer. The output of the interstage drives the 211 in fixed bias. The interstage is hidden under the amp, it was an afterthought.
My GM70 amplifier (picture in previous page used similar circuit but with a pentode strapped triode driving a 6B4G DHT.
Would you post a schematic?
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