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Old 12th May 2020, 01:00 PM   #21
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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I'm 51, you?

Why not to consider compactron tubes? there is a large stock of them, with very interesting characteristics and many of them are cheap.
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Old 12th May 2020, 02:08 PM   #22
Kay Pirinha is offline Kay Pirinha  Germany
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Yes, there's also a Compactron triple triode that actually is three halves of a 12AX7. I've seen it in some Fender amplifiers of the 1980ies. Sadly I don't remember it's designator and I also don't know if it is cheap enough .
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Old 12th May 2020, 02:37 PM   #23
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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6AC10. A 12AX7 and half at a single heater powering cost. Excellent. And combinations of 12AU7s and 12AX7s in single envelope, like 6U10.
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Old 12th May 2020, 03:10 PM   #24
Kay Pirinha is offline Kay Pirinha  Germany
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Not exactly, Osvaldo! IIRC there's a Compactron triple triode with a of 100 for all sections.
Best regards!
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Old 12th May 2020, 03:42 PM   #25
kissabout2002 is offline kissabout2002  Italy
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Quote:
Originally Posted by Osvaldo de Banfield View Post
I'm 51, you?

Why not to consider compactron tubes? there is a large stock of them, with very interesting characteristics and many of them are cheap.
I am 60 that's why when you call me boy I felt good....lol....I am not familiar with compactron tubes but I will consider use them in future....all the best
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Old 12th May 2020, 04:27 PM   #26
32860 is offline 32860
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Quote:
Originally Posted by Kay Pirinha View Post
IIRC there's a Compactron triple triode with a of 100 for all sections.
Best regards!
This may be useful:
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File Type: jpg 6BK11 Data.jpg (100.1 KB, 144 views)
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Old 12th May 2020, 04:43 PM   #27
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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I am being familiar with them. They are pretty fine.
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File Type: jpg Amp 301.jpg (136.5 KB, 138 views)
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Old 12th May 2020, 05:32 PM   #28
stocktrader200 is offline stocktrader200  Canada
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interesting project, I would use KSC1845 for U3 - U12 and the follower positive supply to + 40v with a dropping resistor (10k) and capacitor.
Much easier to implement, tube sound comes from the gain stages

Last edited by stocktrader200; 12th May 2020 at 05:42 PM.
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Old 12th May 2020, 06:48 PM   #29
Kay Pirinha is offline Kay Pirinha  Germany
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I think I'll have to dig out the schematics of the Fender amplifier that I mentioned. Then I can tell the one-and-a-half 12AX7's designator for sure .
Best regards!
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Old 12th May 2020, 07:10 PM   #30
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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6C10 from the below table. But it is expensive. Less used triple triodes or double triodes plus diodes (6B10, 6AG11) and double pentodes are very useful. 6BF11 is a pretty pentode/tetrode combination, and has a very interesting hysteretic behavior in the pentode's screen and suppressor grids:
Delayed relay pentode driven
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