6BQ5/EL84 in Parallel Push-Pull Circuit

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6BQ5/EL84 in Parallel Push-Pull Circuit

Postby joeztech » Mon Mar 23, 2015 9:30 am

If I wanted to build a parallel push-pull output stage using four 6BQ5/EL84 tubes producing about 30-35 watts what impedance output transformer primary should I look for?

Joe
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Re: 6BQ5/EL84 in Parallel Push-Pull Circuit

Postby andrewbee » Mon Mar 23, 2015 2:40 pm

A little over 4K should be good. Something like this -

http://triodeelectronics.com/

NEW A470-S, a reproduction of the Dynaco A470 output transformer as used on the Dynaco (tm) ST70 and MkIV amplifiers.
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Re: 6BQ5/EL84 in Parallel Push-Pull Circuit

Postby Geek » Mon Mar 23, 2015 3:47 pm

I don't see a direct URL to that transformer, Andrew (???)

But here's a darn good one as well:
https://edcorusa.com/cxpp60-8-4_2k

This will give you lower THD:
https://edcorusa.com/cxpp30-ms-5k
-= Gregg =-
Fine wine comes in glass bottles, not plastic sacks. Therefore the finer electrons are also found in glass bottles.
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Re: 6BQ5/EL84 in Parallel Push-Pull Circuit

Postby andrewbee » Mon Mar 23, 2015 5:31 pm

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Re: 6BQ5/EL84 in Parallel Push-Pull Circuit

Postby rmyauck » Thu Mar 26, 2015 10:19 am

This one may give you more options down the road and less $ too.

http://triodeelectronics.com/40-18080.htm
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