K&K Audio / Lundahl Transformers

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RE: Question re 6BX7GT in 300B push pull designs

Posted by KevinC on July 21, 2016 at 18:47:24:
I have used EL34s for this purpose in two similar amp designs over the past 5 years with somewhat better results than I was able to get with 6BX7GTs. The voltage and current requirements are greater, so that is a disadvantage, but as you point out, the tubes are still available and since they are single element tubes, matching can be accomplished in a straightforward way, and they are arguably better drivers for high swing requiring tubes like 300Bs. When using EL34s I used the LL1671/PP as the interstage, as it's a better match and that eliminates the need to deal with high frequency out-of-band resonances.

I would say that we were missing the mark by not using a little more current to create better driver stages for challenging output tubes!