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807 Tube Triode Connected
807 Tube Triode Connected
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Old 17th September 2013, 06:57 PM   #31
Miles Prower is offline Miles Prower  United States
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Quote:
Originally Posted by JonSnell Electronic View Post
The humble 807 is more efficient in class C as an HF switch...
Not really. The 807 is a 6L6, originally intended for audio PA use, repackaged in a glass envelope with a top cap, and the then standard five pin base as an RF amp. 6L6-oids were briefly used as TV HD finals, but not for very long, as CRTs grew bigger.

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so possibly a good class D output stage?
I may make one to see. A novel idea.
You'd do better with one of the TV HD finals as these were designed to function as fast switches, and that could pull some bigamps at very low Vpk. Some of these compactron types include the damper diode in the same bottle, and those would do better for Class D than any 6L6-oid.
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Old 17th September 2013, 10:34 PM   #32
multi is offline multi  Australia
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THE 807 was tested by the AWA valve company for use in the Williamson KT66 amplifier triode connected.
And was found to easily handle 400 volts.
STC also runs 807's at 400 volts for 15 watts output 3K A-A.
VTL has triode connected 807's running at 600 volts 36 ma.
I have used 807's at 500 volts triode connected for many years.
Phil
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Old 12th November 2013, 02:41 PM   #33
MirouP is offline MirouP  Czech Republic
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It's very interresting and valuable thread for me. I'm going to use 807s for my first PP amp and V3C looks very nice. I bought some original TESLA E88CC to use them in it.
Mira.
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Old 13th November 2013, 03:32 AM   #34
multi is offline multi  Australia
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I have used the 807 as a triode but using the Williamson circuit at 400 volts; fixed bias.
You need to use 5687's or the Russian 6N6P, as drivers not 6sn7's to get sufficient drive.
Better to use El34's as triodes much easier to drive. but 807's are cheap.
Phil
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Old 13th November 2013, 10:14 AM   #35
Shoog is offline Shoog
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Aren't they rated as 1.5w output as triode and 20w as pentode. Seems there are far better candidates for triode use.

Shoog
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Old 13th November 2013, 01:16 PM   #36
MirouP is offline MirouP  Czech Republic
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Yes, 807 is rated aprox. 1.5W output as triode in SE A-class amp, but PP AB-class can, depending how close it is to A-class, give much more.

Mira.
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Old 13th November 2013, 01:37 PM   #37
daqvin_carter is offline daqvin_carter  United States
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I ran 1625s (12 volt version of 807) push pull ultralinear in a car stereo amplifier for a few years.
I ran plate and screens at about 420 volts without any poblems. Never had to change tubes and they matched perfectly after about 18 months of daily use.
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Old 13th November 2013, 03:11 PM   #38
MomchilD is offline MomchilD  Bulgaria
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Old 13th November 2013, 03:57 PM   #39
artosalo is offline artosalo  Finland
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With 430 V supply voltage and 4k OPT, triode connected 807 will give 15 W minimum.
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Old 13th November 2013, 04:38 PM   #40
MomchilD is offline MomchilD  Bulgaria
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At SE class A not more than ~ 7W by actual minimum distortion.
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