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211SE with 14K Trs
211SE with 14K Trs
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Old 13th January 2018, 01:39 AM   #1
L CAO is offline L CAO  China
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Default 211SE with 14K Trs

With 211 tube made a single-ended power amplifier, the use of a 14K impedance of the output transformer, so you can not loop negative feedback.
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Old 13th January 2018, 03:12 AM   #2
L CAO is offline L CAO  China
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EF91+5686+211
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Old 13th January 2018, 05:24 AM   #3
L CAO is offline L CAO  China
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EF91 & 5686 are triode connected.
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Old 13th January 2018, 06:00 AM   #4
L CAO is offline L CAO  China
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Test Results:

1 watt output frequency response:
1W频响_副本.jpg

8 ohm 10 watt output frequency response:
10W频响_副本.jpg

Output power VS distortion:
失真功率_副本.jpg

FFT:
FFT_副本.jpg
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Old 13th January 2018, 06:25 AM   #5
L CAO is offline L CAO  China
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211 operating point is: 1000V 60mA
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Old 13th January 2018, 06:44 AM   #6
jazbo8 is offline jazbo8
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211SE with 14K Trs
They are beautiful, and thanks for sharing the design!
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Old 13th January 2018, 12:46 PM   #7
waltube is offline waltube  Italy
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The FB loop exist
Not from out but from driver stage

Walter
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Old 13th January 2018, 03:46 PM   #8
rdf is offline rdf  Canada
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Quote:
Originally Posted by L CAO View Post
Test Results:
That's truly impressive performance. What are the output transformers?
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Last edited by rdf; 13th January 2018 at 03:50 PM.
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Old 13th January 2018, 04:20 PM   #9
artosalo is offline artosalo  Finland
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Performance (THD vs. output power) at 1 kHz is not fully informative.
But how is it if measured below 30 Hz.
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Old 13th January 2018, 07:32 PM   #10
Lingwendil is offline Lingwendil  United States
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211SE with 14K Trs
Clever feedback, clean assembly, and nice numbers. Great build. Glad to see a little feedback in a DHT design, the zero-NFB craze is too overdone and it's nice to see something that isn't just thrown together!

Great job.
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