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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Heeey... could we adapt this to a 45? posted by Vinnie on October 4, 2007 at 14:23:48:
71A and 45 have same amplification factor and Miller capacitance, so 45 should work in this circuit too. However, if full benefit of increased power is to be obtained, B+ and idle current should be increased, and there will be much more heat generated by the cathode resistor. Will also take 1.5 times of driving signal swing.
Instead of parallel 6SL7 I would use a tube with more driving power, something like one section of 12AT7 or 12AZ7, choke load it, and feed it from a separate supply. Voltage gain will be about the same.
The most vulnerable spot of this circuit is cathode bypass cap. There is nothing remotely good in this value, so provided all parts are as good as it gets, this cap will dominate the sonic signature.
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Follow Ups
- It is possible. - sser2 10/4/0719:33:23 10/4/07 (3)
- RE: It is possible. - drlowmu 23:40:24 10/4/07 (0)
- RE: There is nothing remotely good in this value - Caucasian Blackplate 22:11:28 10/4/07 (1)
- RE: There is nothing remotely good in this value - drlowmu 23:21:43 10/4/07 (0)
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