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Twin Audio Twin Audio is a manufacturer of hand made audiophile tube amplifiers.

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Old 12th March 2010, 01:42 AM   #11
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Quote:
Originally Posted by kevinkr View Post
Me too.. I currently use RC coupled 6J5 into 6SN7 SRPP. Consider fixed bias on the 300B with 70mA - 80mA @ 400V B+ and a 3K - 3.5K opt.

Your amplifier looks very nice! (And reasonably priced as well.)
Hi Kevin,

Thank you. The bias of this 300B is 70mA@420V B+ and 3.5K OPT.

6J5 is a classic single triode which is equal to half 6SN7. We ever used 6J5/L63 to make preamps before. I like them.

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6J5/L63 choke load preamp:

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Old 12th March 2010, 03:18 PM   #12
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Second 300BSE for Mark.

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Old 12th March 2010, 03:21 PM   #13
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Same circuit as the first one. The output transformers are made by vintage steel core, called "Golden Sand".

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Old 12th March 2010, 03:36 PM   #14
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Old 13th March 2010, 02:40 AM   #15
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Input stage: single 6SN7
Driver stage: a matched pair 6SN7s

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Old 13th March 2010, 03:00 AM   #16
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We made 4 audio signal inputs and 2 speaker outputs, 4 & 8 ohms.

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Old 13th March 2010, 03:05 AM   #17
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4 inputs with CMC 816U RCA sockets and British made input selector.

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Old 13th March 2010, 03:58 AM   #18
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Oakwood chassis with red paint.

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Old 13th March 2010, 02:42 PM   #19
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The power transformer of the 2nd 300B amp:
Z11 0.35mm EI steel core
Power: 250VA
Size: 96 x 67

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Old 13th March 2010, 02:45 PM   #20
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10H/250mA Choke for 300B, Z11 core.

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