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Has anyone used an opamp to split phase for a tube amp?
Has anyone used an opamp to split phase for a tube amp?
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Old 20th December 2017, 01:18 AM   #91
leadbelly is online now leadbelly  Canada
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Has anyone used an opamp to split phase for a tube amp?
Quote:
Originally Posted by JZatopa View Post
Follow up question for the group.

Do you think this could be taken to the point of pushing a pair of EL34's or similar tube?
That point was already passed. If an opamp can drive a KT88, it can certainly drive the much easier load of an EL34.

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Originally Posted by JZatopa View Post
It seems to me like this would be a great way to build a simple and affordable PP amplifier for those who are curious about tubes but don't want a huge investment.
Nope. Don't agree with most of petertub's post, but have to say that driver tubes are typically an already very small portion of a tube amp's cost.
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Old 20th December 2017, 01:47 AM   #92
indra1 is online now indra1  Indonesia
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Hi artosalo, in case that you have missed, Mos57 described a delay related issue of a similar op amp splitter on post #15 newbee-phase-splitter-question which RJM1 offered solution on post #25.
I repost the picture here, bottom schema.
Click the image to open in full size.
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Old 13th January 2018, 02:56 AM   #93
JZatopa is offline JZatopa  United States
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Quote:
Originally Posted by artosalo View Post
Not necessarily, if you want something special.
I wanted to take use of full potential of great 6N6P twin triode. In typical AB1 circuit this can produce some 3 W. With AB2 some 7...8 W is available with very good linearity.

If this were built with tubes only, the circuit would become quite complicated and a lot of glass is needed.
That's a fun looking project, any chance you made extra boards?

Would you be willing to share the power supply schematic as well?
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Old 13th January 2018, 09:55 AM   #94
artosalo is offline artosalo  Finland
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I have some extra boards.
There are separate high voltage power supply/regulator board and low voltage regulator board.

Schematic:
Attached Images
File Type: gif 6N6P_OP_PS.GIF (29.0 KB, 87 views)
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Old 17th January 2018, 08:11 PM   #95
PPrabi is offline PPrabi  France
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Read my example on page 5
EL84 Push-Pull transconductance amp using smps
Éric.
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