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Old 11th February 2015, 07:15 AM   #1
65 DegN is offline 65 DegN  United States
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Default Current mfg triode's

Are there any power triode's in current production that are not ridiculously expensive?
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Old 11th February 2015, 07:27 AM   #2
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6c33, 6n13s, 6as7, 6080, 6s19s, etc
Also many transmitter tubes that i can't think of right now.

How much is "not ridiculously expensive"?

edit: sorry, didn't really pay attention to "current production".

Last edited by ballpencil; 11th February 2015 at 07:52 AM.
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Old 11th February 2015, 12:09 PM   #3
65 DegN is offline 65 DegN  United States
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Thanks, looks like some excellent possibilities there.
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Old 11th February 2015, 01:46 PM   #4
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Hi 65 DegN

why do you ask for current production?

cheers, Erik
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Old 11th February 2015, 01:48 PM   #5
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If you don't mind triode-connecting a pentode, the "tv tube" 6CB5A is a great budget option. I built a variation of this and was pleased with the results:
VinylSavor: Low Cost Single Ended 6CB5A Amplifier - Part 1

The Electro Harmonix 300B - I see the price has gone up a bit - has also given some very good results when I built a SE amp with 'em.

Last edited by kstagger; 11th February 2015 at 01:52 PM.
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Old 11th February 2015, 05:23 PM   #6
65 DegN is offline 65 DegN  United States
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ErikdeBest, I am interested in current production because so many of the old tubes are cost prohibitive these days. A 300B is up around $175 for a Chinese made tube and NOS is around $1,500.
I am thinking of doing some experimenting and I'm semi-retired so a limited budget.
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Old 11th February 2015, 05:51 PM   #7
65 DegN is offline 65 DegN  United States
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kstagger, looks simple and low budget enough. Do you know if anyone has anyone done a THD analysis on these amps?
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Old 11th February 2015, 06:09 PM   #8
TheGimp is offline TheGimp  United States
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EH 300B is only $110 at tube depot.

https://tubedepot.com/products/elect...FdGxoCmrzw_wcB

Seems pretty reasonable to me.
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Old 11th February 2015, 06:34 PM   #9
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Quote:
Originally Posted by 65 DegN View Post
Are there any power triode's in current production that are not ridiculously expensive?
That depends on your threshold for "ridiculously expensive", and whether or not you want pure triodes or pseudotriodes made from power pents.

You have voltage regulator triodes like the 6AS7 and 6C33C still in production. The latter isn't particularly cheap, though.

The 845 is current production, and can be had without blasting a huge hole in your wallet.

There are RF power triodes like the 811 and 812 (the former, current production, the latter: ) though both of these will require some stiff grid drivers since they'll be operating with grid current for most, if not all, the signal cycle.

6V6s and 6L6s can be trioded, and some TV HD power pents (not current production) can work very well as pseudotriodes.
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Old 11th February 2015, 10:16 PM   #10
kevinkr is offline kevinkr  United States
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The GM70 is another possibility, not very expensive yet.
Inexpensive to buy, but not quite so inexpensive to use well. (60W filament, high plate voltage requirement)
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