6BQ5/EL84 in Parallel Push-Pull Circuit
Posted:
Mon Mar 23, 2015 9:30 amby joeztech
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
Re: 6BQ5/EL84 in Parallel Push-Pull Circuit
Posted:
Mon Mar 23, 2015 2:40 pmby andrewbee
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.
Re: 6BQ5/EL84 in Parallel Push-Pull Circuit
Posted:
Mon Mar 23, 2015 3:47 pmby Geek
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_2kThis will give you lower THD:
https://edcorusa.com/cxpp30-ms-5k
Re: 6BQ5/EL84 in Parallel Push-Pull Circuit
Posted:
Thu Mar 26, 2015 10:19 amby rmyauck
This one may give you more options down the road and less $ too.
http://triodeelectronics.com/40-18080.htm