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In Reply to: RE: Phase inverter tube choice question posted by fredtr on May 16, 2020 at 07:35:01
Believe it or not, I'm using 85db Zaph Audio SR71's with NO problems.
I got the EH 12BH7 tubes yesterday and tried them in the splitter positions. I really don't understand how ANYONE can say, they don't make an impact. I popped them in and HOLY COW. The upper bass/lower midrange was solid as a rock! Great tone. I'm only hoping that the upper treble relaxes a little more as the tubes break in. But in short they are much better balanced than the 12AU7's and offer more "feeling" to the sound.
I'll start a new post with the results.
Thanks for asking
charles
Follow Ups:
The EH 12BH7 tubes will settle. If I recall correctly Bob Latino stated that they handle voltage swings far better than the 12AU7. My ST-70 is currently using an NOS Tung Sol 12AU7 in the center, the two EH 12BH7 on the outboard and four Psvane EL34s for power. A Sovtek rectifier as well. It's a sweet sounding amp that is the heart and soul and as it plays tunes as well as being used for the TV it is on most of the time and is very stable.
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