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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 27 Oct 2020, 21:40

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 Post subject: Serious about tube OPT?
PostPosted: 26 Apr 2020, 11:42 
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Joined: 14 Feb 2010, 13:13
Posts: 711
Location: Lisbon, Portugal
Well this certainly deserves a look!

His webpage has also more interesting stuff!

Preview:
Attachment:
Untitled.png

Full PDF
http://www.tubetvr.com/transformers.pdf


Have fun! :)

Miguel


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PostPosted: 27 Apr 2020, 19:05 
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Joined: 23 Feb 2017, 02:02
Posts: 677
https://www.china-hifi-audio.com/en/xia ... 240c90765b
I own one of these, the sound quality was not sastifying so I redsigned the entire amp, keeping the original tubes other than swapping out the input stage to an 12AX7
Most hillarious thing is that the cut off 3dB is arround 10-14kHZ without any feedback due to output transformer.

But the orginal schmatic puts the feedback to counter this prolbem


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