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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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5th Jul 2022, 7:28 am | #1 |
Banned
Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
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1/2 12ax7
So I have a quick question. Does anybody know of a single triode similar to the 6AV6.
Its so close to half a 12AX7 that apart from heater voltage, it doesnt matter. I dont care about the diodes, but I am looking for low noise, and preferably in seven pin minature. I already know about the 6AT6, which is close, but more like a half of a 12AY7. Joe |
5th Jul 2022, 7:47 am | #2 |
Pentode
Join Date: Nov 2020
Location: Bristol, UK.
Posts: 131
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Re: 1/2 12ax7
Mullard EBC91 ?
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5th Jul 2022, 8:46 am | #3 |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,061
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Re: 1/2 12ax7
6AV6 (may be the same as radiomobile's EBC91).
But you'd have two unused anodes... if you don't like unused sections it's a toss-up between an unused anode and grid (12AX7) or these two anodes. |
5th Jul 2022, 10:29 am | #4 |
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Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
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Re: 1/2 12ax7
Yes I have two unused diodes with a 6AV6 too, But I can just tie them to cathode ( I think ). I was hoping for some perhaps obscure CV series ( yes its Common Valve ) but not in Australia. Here CV is 99% military issue. I have quite a few 6AV6 and, 6AT6 for that matter, but I thought I would pick the brain of the trust of brainz and see what surfaces. I am inventing more problems for myself probably, but there is no such thing as too much correct information.
Thanks guys Joe |
5th Jul 2022, 11:29 am | #5 |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
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Re: 1/2 12ax7
6C4 / EC90 is essentially one half of 12AU7 / ECC82 (which I daresay you knew already Joe) but I'm stumped over an unadorned 12AX7 / ECC83 half.
Colin |
5th Jul 2022, 1:17 pm | #6 |
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Re: 1/2 12ax7
Apart from their whomped-up prices, why not use half a 12AX7? You can save the heater power on the unused side. 9 pin is a bit bigger than 7 pin, but not greatly so.
David
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5th Jul 2022, 2:35 pm | #7 |
Heptode
Join Date: Mar 2011
Location: Dorset, UK.
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Re: 1/2 12ax7
Two possible seven pin miniature base single triodes that have the same characteristic as 12AX7 are Tung-Sol 6DR4, Tung-Sol and Sylvania 6BK6 / 12BK6 with double diodes.
No equivalents so may be hard to find! Rich
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5th Jul 2022, 8:56 pm | #8 |
Octode
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Location: Penrith, Cumbria, UK
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Re: 1/2 12ax7
I think you answered your own question Joe.
I'd be perfectly happy to use a 6AV6/EBC91 (same valve as we all know) in a situation that required half an ECC83, as you say, electrically its pretty much identical. Strap the anodes to the cathode and away you go. I am assuming its for an Audio application? These double diode triodes were often used as Audio preamplifiers back in the day. You've got a stash so what have you to lose? RW comment about using half an ECC83 is valid but his comment about the cost of them these days is even more valid. I'd even think about using a couple of EBC91 where an ECC83 would be specified in a homebrew project on the basis that theres lots around and they're cheap. I noticed your comment about "apart from heater voltage they're identical" and wondered if you are using 12.6V Heater supply? If so then theres the 12AV6 and probably even cheaper if you can find some. Just my pennyworth Joe for what its worth. Andy. Last edited by bikerhifinut; 5th Jul 2022 at 9:00 pm. Reason: remembered summat |