Low cost class A Hi-Fi amplifier 807 S.E. Ultralinear - Pentode drivers [6G6G] - diyAudio
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Old 24th July 2013, 09:25 AM   #1
pilovis is offline pilovis  Italy
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Default Low cost class A 807 amplifier S.E. Ultralinear - unconventional pentode drivers

Go against the tide

Link to download full size schematic: http://www.lovisolo.com/valvole/807b.jpg

Audio output transformers: http://www.enovaz.it/prodotto-142985/TU022.aspx

807 tube specs: http://scottbecker.net/tube/sheets/030/q/QE06-50.pdf (QE06/50 = 807 = VT 100)

6G6G tube specs: http://www.r-type.org/exhib/aaa0141.htm


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Last edited by pilovis; 24th July 2013 at 03:02 PM.
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Old 24th July 2013, 01:52 PM   #2
pilovis is offline pilovis  Italy
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Last edited by pilovis; 24th July 2013 at 02:16 PM.
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Old 25th July 2013, 12:49 AM   #3
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Nice work. I recently got into UL connected SE pentodes, and like the sound very much. I also like working with pentode drivers.
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Old 31st August 2013, 02:54 PM   #4
pilovis is offline pilovis  Italy
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This is the final version with preamplifier (6SN7) and tone control:
All tubes, no semiconductors.

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Last edited by pilovis; 31st August 2013 at 03:04 PM.
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Old 31st August 2013, 04:03 PM   #5
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Very beautiful job. That looks like a lot of fun. I like the speaker/amp combo very much. What speaker (driver) did you use and did you port the box or is it sealed etc? -Fred
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