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Old 27th October 2012, 11:47 AM   #1
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Default 6sn7 driving Push Pull Parallel kt88's?

Does the 6sn7 have guts to drive a quad of kt88s in push pull parallel.
in a Williamson configuration that is.

id assume so since the 12au7 drives kt88s in normal P-P in many circuits,
and the 6sn7 seems to be alot like it but just bigger and more linear.

any suggestions?
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Old 27th October 2012, 12:00 PM   #2
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Quote:
Originally Posted by ruben alstad View Post
Does the 6sn7 have guts to drive a quad of kt88s in push pull parallel.
in a Williamson configuration that is.

id assume so since the 12au7 drives kt88s in normal P-P in many circuits,
and the 6sn7 seems to be alot like it but just bigger and more linear.

any suggestions?
the 6sn7 should be what you call the phase split inverter its what drive the output tubes there shoud a be a 2nd 6sn7 driving the first 6sn7 the gain or guts comes from the pre driving into the 2nd 6sn7 witch then drives the 1st 6sn7 the phase tube its what we call drive/phase/output the 6sn7 is the big daddy to the 12ax7 i have added data sheets
abd some circuts to give you a idear
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Old 27th October 2012, 12:08 PM   #3
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Quote:
Originally Posted by bigspeaker View Post
6sn7 is the big daddy to the 12ax7 i have added data sheets
abd some circuts to give you a idear

so i take it two 6sn7s one for gain and one for phase driving 4 kt88s is viable.
i thought the 6sn7 was more like the 12au7 because of gain factor.
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Old 27th October 2012, 12:19 PM   #4
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Quote:
Originally Posted by ruben alstad View Post
so i take it two 6sn7s one for gain and one for phase driving 4 kt88s is viable.
i thought the 6sn7 was more like the 12au7 because of gain factor.
12ax7 will be better 12au7 to low if you are using it for guitar amp i buit such a amp with 12ax7 and it worked very well
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Old 27th October 2012, 12:22 PM   #5
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Quote:
Originally Posted by bigspeaker View Post
12ax7 will be better 12au7 to low if you are using it for guitar amp i buit such a amp with 12ax7 and it worked very well
thought guitar amplifiers ect was for another forum.
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Old 27th October 2012, 12:25 PM   #6
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Quote:
Originally Posted by ruben alstad View Post
thought guitar amplifiers ect was for another forum.
12ax7 will work fine 3 12ax7 and your kt88's it will rock you have circuit
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Old 27th October 2012, 12:27 PM   #7
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the circuit were to give an idea of how all the bit fit
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Old 27th October 2012, 01:00 PM   #8
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Quote:
Originally Posted by bigspeaker View Post
12ax7 will work fine 3 12ax7 and your kt88's it will rock you have circuit
trying to pull off an octal tube only amplifier, a 6sn7 driver phase kt88 PPP stereo amplifier has being floating on my mind alot recently.
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Old 27th October 2012, 08:28 PM   #9
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Don't believe everything you read, even here. The 6SN7 is an excellent driver, even in the extreme case of triode connected output valves.

All good fortune,
Chris
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Old 28th October 2012, 08:34 AM   #10
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GEC developed a circuit for Multiple Kt 88 using 6SN7's. The amp uses a 6SN7 cathode follower to drive the out put stage for low impedance drive.
The last tube you would want to use to drive KT88's or 6550's is a 12AX7 they are hi mu high plate resistance, high distortion tubes and no good as drivers, nothing like a 6SN7 which is low mu, low plate resistance, low distortion and excellent driver.
Can scan the circuit if any one interested but it is on the Net
Phil
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