10 band EQ all tubes - Page 3

Osvaldo de Banfield · 01:13 PM

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.

Kay Pirinha · 12th May 2020, 02:08 PM

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

.
Best regards!

Osvaldo de Banfield · 12th May 2020, 02:37 PM

6AC10. A 12AX7 and half at a single heater powering cost. Excellent. And combinations of 12AU7´s and 12AX7´s in single envelope, like 6U10.

Kay Pirinha · 12th May 2020, 03:10 PM

Not exactly, Osvaldo! IIRC there's a Compactron triple triode with a µ of 100 for all sections.
Best regards!

kissabout2002 · 12th May 2020, 03:42 PM

Quote:

Originally Posted by Osvaldo de Banfield

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

32860 · 12th May 2020, 04:27 PM

Quote:

Originally Posted by Kay Pirinha

IIRC there's a Compactron triple triode with a µ of 100 for all sections.
Best regards!

This may be useful:

Osvaldo de Banfield · 12th May 2020, 04:43 PM

I am being familiar with them. They are pretty fine.

stocktrader200 · 05:42 PM

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

Kay Pirinha · 12th May 2020, 06:48 PM

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!

Osvaldo de Banfield · 12th May 2020, 07:10 PM

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

12th May 2020, 01:00 PM	#21
Osvaldo de Banfield diyAudio Member Join Date: Dec 2011 Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina	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. __________________ Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001. Argentine Ham Radio LW1DSE since 1987. Last edited by Osvaldo de Banfield; 12th May 2020 at 01:13 PM.

12th May 2020, 02:08 PM	#22
Kay Pirinha diyAudio Member Join Date: Oct 2011 Location: Somewhere in Germanistan	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 . Best regards! __________________ "I spent a lot of money on booze, birds and fast cars. The rest I just squandered." (George Best)

12th May 2020, 02:37 PM	#23
Osvaldo de Banfield diyAudio Member Join Date: Dec 2011 Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina	6AC10. A 12AX7 and half at a single heater powering cost. Excellent. And combinations of 12AU7´s and 12AX7´s in single envelope, like 6U10. __________________ Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001. Argentine Ham Radio LW1DSE since 1987.

12th May 2020, 03:10 PM	#24
Kay Pirinha diyAudio Member Join Date: Oct 2011 Location: Somewhere in Germanistan	Not exactly, Osvaldo! IIRC there's a Compactron triple triode with a µ of 100 for all sections. Best regards! __________________ "I spent a lot of money on booze, birds and fast cars. The rest I just squandered." (George Best)

12th May 2020, 05:32 PM	#28
stocktrader200 diyAudio Member Join Date: Jan 2008 Location: Calgary	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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12th May 2020, 06:48 PM	#29
Kay Pirinha diyAudio Member Join Date: Oct 2011 Location: Somewhere in Germanistan	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! __________________ "I spent a lot of money on booze, birds and fast cars. The rest I just squandered." (George Best)

12th May 2020, 07:10 PM	#30
Osvaldo de Banfield diyAudio Member Join Date: Dec 2011 Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina	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 __________________ Osvaldo F. Zappacosta. Electronic Engineer UTN FRA from 2001. Argentine Ham Radio LW1DSE since 1987.

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