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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 Oct 2022, 7:28 pm | #1 |
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Join Date: Nov 2014
Location: Derry, Northern Ireland, UK.
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Double valve special triode info needed / wanted
Hello my good people and wonderful friends,
Would any of you fantastic persons know of a valve/tube that is an ecc83 inside and an ecc81 or ecc82 combination style valve, all included in the same glass bulb. Please help me out as I know there is something or someone out there that fits my invisioned circuit plan. Thank You Your's Truely, Tritone. |
5th Oct 2022, 7:39 pm | #2 |
Dekatron
Join Date: Sep 2007
Location: Oxfordshire, UK.
Posts: 4,311
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Re: Double valve special triode info needed / wanted
The 12DW7 contained one 12AU7 (=ECC82) triode and one 12AX7 (=ECC83) one https://frank.pocnet.net/sheets/127/1/12DW7.pdf. JJ still make them, labelled ECC832 https://www.jj-electronic.com/en/ecc832-12dw7.
Cheers, GJ
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5th Oct 2022, 7:48 pm | #3 |
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Re: Double valve special triode info needed / wanted
Wow Joe,
So it is seriosly doo-able, ? You the man, Many Thanks to you sir ! |
6th Oct 2022, 8:14 am | #4 |
Hexode
Join Date: Apr 2007
Location: W Yorks, UK.
Posts: 407
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Re: Double valve special triode info needed / wanted
6K11/6Q11 contains two 12AX7 triodes and a 12AU7 triode.
6U10 contains two 12AU7 triodes and a 12AX7 triode. |
6th Oct 2022, 10:22 am | #5 |
Heptode
Join Date: Jan 2008
Location: Sheffield, South Yorkshire, UK.
Posts: 656
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Re: Double valve special triode info needed / wanted
The 6CY7 also contains 2 triodes with different characteristcs, however I'm not sure how close they are to ECC81, 82, 83.
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6th Oct 2022, 10:38 pm | #6 |
Heptode
Join Date: May 2017
Location: Konongo, Ghana
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Re: Double valve special triode info needed / wanted
One triode section of the 6CY7 can be used as a voltage amplifier (its amplification factor is 68). The other triode section is not comparable to ECC81, 82, 83 since it was designed to pass relatively large currents (around 35 mA).
https://frank.pocnet.net/sheets/093/6/6CY7.pdf
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Robert |
6th Oct 2022, 11:22 pm | #7 |
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Re: Double valve special triode info needed / wanted
There are quite a few valves called "Twin triode, dissimilar sections", in any data book. They come in both noval ( 9 pin ) and octal. Most of them were intended for B/W TV service as the oscillator and output of vertical scanning sections of the picture. A lot of them are highly useful in audio, and in a few cases, small regulators for power supply service. I have probably five or six different valves that come into this category.
6CM7 6CS7 6CY7 6DE7 6DN7 6DR7 6EA7 6EM7 6EW7 to name a few Joe |
7th Oct 2022, 8:44 am | #8 |
Heptode
Join Date: Oct 2005
Location: Olympia, Washington, USA.
Posts: 664
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Re: Double valve special triode info needed / wanted
A copy of 'Tube Lore 2 by Lud Sibley" will give you dozens of tubes with what you are looking for.
Expensive- yes, but SO worth it. It has fantastic information in it. |
7th Oct 2022, 2:03 pm | #9 |
Pentode
Join Date: Mar 2022
Location: Harrow, Middlesex, UK.
Posts: 232
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Re: Double valve special triode info needed / wanted
I put "Tube Lore" and "Sibley" in Bookfinder and it found me many copies of the first edition, but Tube Lore II only via Amazon US, which then told me "This item cannot be shipped to your selected delivery location. Please choose a different delivery location."
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7th Oct 2022, 2:51 pm | #10 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 14,007
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Re: Double valve special triode info needed / wanted
Does it have to be a B9A envelope??
If not then look at the early 1960s Compactron tubes made by General Electric in the US, intended for TV applications. They did some triple triode versions, easy to accommodate when you have a 12 pin Base.
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7th Oct 2022, 10:10 pm | #11 |
Banned
Join Date: Nov 2014
Location: Derry, Northern Ireland, UK.
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Re: Double valve special triode info needed / wanted
That is so much amazing info and provision of knowledge from all of you
It keeps my circuit on the board down to a minimal, I am driving a 'heavy so called load' right down to it's boots and it needs that combo. Thanks my Friends. |
8th Oct 2022, 1:35 am | #12 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Re: Double valve special triode info needed / wanted
There are missing answers to an unasked question.
It's one thing to be aware of all these relatively unusual valves, but would they use one in something they were making? By their very unusual-ness they could be more of a pain to find replacements for, should it be necessary, than the pain of using two separate mainstream valves. Sure the mainstream valves would give you a couple of triodes left over, but could they be exploited in other areas? Just chucking a barrowload of clogs into the machine... David
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