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Old 6th March 2009, 09:59 PM   #1
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Default Is there a LOCTAL equiv to a 6V6?

Looking for a good loctal pen/tetrode. Thanks, Ray
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Old 6th March 2009, 10:07 PM   #2
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7C5
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Old 6th March 2009, 10:38 PM   #3
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Old 7th March 2009, 12:52 PM   #4
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Russian 6P1P /6П1П/.
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Old 9th March 2009, 07:54 PM   #5
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Quote:
Originally posted by azazello
Russian 6P1P /61/.
That's not loktal nor even octal
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Old 9th March 2009, 09:00 PM   #6
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Quote:
Originally posted by Boris_The_Blade
7C5

A really good way to get into good-sounding NOS tubes, too.

These are an exact functional equivalent to the 6V6, and you can usually find them for $10 or less, each, for NOS tubes.

Most of these were made by Sylvania... and IME, they usually have VERY close tolerances. I find that most of them automatically match within a few percent, without having to cherry-pick matched sets...

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Gordon.
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Old 9th March 2009, 09:15 PM   #7
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Quote:
Originally posted by GordonW



A really good way to get into good-sounding NOS tubes, too.

These are an exact functional equivalent to the 6V6, and you can usually find them for $10 or less, each, for NOS tubes.

Most of these were made by Sylvania... and IME, they usually have VERY close tolerances. I find that most of them automatically match within a few percent, without having to cherry-pick matched sets...

Regards,
Gordon.

Gordon,

A look at the 7C5 data sheet indicates g2 limits akin to those of the 6AQ5 (yet another 6V6 family member).

Were Locktal based tubes made anywhere other than Sylvania's Emporium, PA, plant? AFAIK, not in the U.S.A.
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Old 9th March 2009, 09:29 PM   #8
GordonW is offline GordonW  United States
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Quote:
Originally posted by Eli Duttman



Gordon,

A look at the 7C5 data sheet indicates g2 limits akin to those of the 6AQ5 (yet another 6V6 family member).

Were Locktal based tubes made anywhere other than Sylvania's Emporium, PA, plant? AFAIK, not in the U.S.A.
Somewhere, I have a 7C5 datasheet that looks more like a 6V6.

In any case... I've repeatedly and deliberately run them at levels like a 6V6... 300-310v on the plates and screens, cathode bias, so it's like 275v differential between cathode and plate. None has ever complained. Sound EXCELLENT...

EDIT: Found it. It's on Pete Millett's Sylvania manual page. http://www.pmillett.com/tubedata/Syl...vania_1951.pdf

This manual shows 285V as permissible. I over-run that a bit, but not more than 10% over...

Regards,
Gordon.
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Old 9th March 2009, 09:33 PM   #9
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Eli
I've seen you make this comment before. I've also seen someone post that Sylvania used 6V6 parts and just stuffed them in a different bottle. I wouldn't know, but I do know I built Poinzs' latest but with the 7C5 (300 ohms plus diode for triode connection). I've had no problems. In fact, its the best amp I've ever had in my house and seems just made for my Lowthers.
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Old 10th March 2009, 02:19 AM   #10
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Originally posted by Bruce Anderson
Eli
I've seen you make this comment before. I've also seen someone post that Sylvania used 6V6 parts and just stuffed them in a different bottle. I wouldn't know, but I do know I built Poinzs' latest but with the 7C5 (300 ohms plus diode for triode connection). I've had no problems. In fact, its the best amp I've ever had in my house and seems just made for my Lowthers.
Bruce Anderson

That which is published and that which actually is frequently are different. See Gordon's link to Pete Millett's site.

I'd be surprised if Sylvania did anything other than use the exact same "cages" in both 6V6s and 7C5s. After all, they were in business to turn a profit. Given my belt and suspenders nature about things electrical, that French data sheet makes me raise the yellow flag.
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