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Old 23rd August 2001, 06:53 AM   #1
ppl is offline ppl  United States
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Have anyone Hear tried any of the TV type of Horizontal output Tubes like 12BQ7 TIA.
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Old 30th August 2001, 10:14 PM   #2
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12BQ6 I suppose. 12BQ7 is an HF double triode.

You can see :

Amplifier with 6KG6, similar tube, by Bob Danielak.

Regards, P.Lacombe
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Old 13th October 2001, 02:12 PM   #3
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Default EL509

The sweep tubes are really excellent performers. This is particularly true for EL509/6KD6/6Pi45S. This seems to be the only such tube in current production. Extremely high emission current makes it possible to use this tube even in OTL amplifiers, and this is currently the best tube for such application. But it is better to use EL 509 with good output transformer in PP configuration. Look at
Another example is 8417 tube. Quicksilver manufactured some quite good monoblocks using these tubes in 1970s.

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Old 8th December 2001, 06:31 PM   #4
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Denis posted:

Another example is 8417 tube. Quicksilver manufactured some quite good monoblocks using these tubes in 1970s.

Denis - my experience with the 8417 is 100% opposite to that of the Russki sweep tubes. The 8417 has to be the most UNRELIABLE output tube ever used in audio-good perhaps but UNRELIABLE!

While the EL509s are the most reliable I know.

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Old 9th December 2001, 12:08 AM   #5
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Yes I agree with Allen about 8417s in Quicksilver amps. Philips ECG tubes have less problems while GE tubes did not work well in these amps.

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Old 10th December 2001, 12:56 PM   #6
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Default EL509

Nothin to say about 8417 as the EL509 seems to be the only tube of such tupe currently manufactured. I use only EL509 produced in St. Petersburg by Svetlana, and I dare say this is simply excellent power pentode from any viewpoint. For example, it is possible not only to get about 40 watts of class A power from a PP pair of EL509s, but the transition from class A to class AB is smooth and does not add higher harminics to the distortion spectrum. Of course, it is possible to find similar modes of operation for other pentodes, but there always will be less power, even with 6550.
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Old 17th December 2001, 07:12 PM   #7
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Default tomcat

I seem to recall Tim De Paravinci had a schematic using this tube in Sound Practices some time ago... Food for thought, Hmmm?
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Old 20th November 2005, 07:19 AM   #8
JesseG is offline JesseG  Canada
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Ok, so has anyone got a link to a schematic using the 12BQ7?

I just found 10 of these in a junk shop and bought 'em 'cause they were NOS. Sure would be neat to find a use (audio) for 'em.

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Old 20th November 2005, 09:25 AM   #9
dhaen is offline dhaen  Europe
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PL519 P-P design thread

The EAR 859 is public, but is SE.
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Old 20th November 2005, 10:58 AM   #10
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Take a sweep tube and try it tied as a triode (g2 to plate) - you may never go back to "real" triodes
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