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In Reply to: RE: I was speaking about posted by Tre' on August 12, 2021 at 10:05:57
So are you saying that they are best used with a EL34 output tube?
Honestly, I'm thinking of replacing the driver board and going back to the stock version with a 7643 driver tube.
Follow Ups:
4300 ohms matches up with a el34. The KT66 needs a higher impedance."Honestly, I'm thinking of replacing the driver board and going back to the stock version with a 7643 driver tube."
OK, now you've got me confused. The original ST 70 used a 7199.
I assume the "original" aftermarket driver board used a 7643?
edit. I see. the 7643 is a sub for a 7199.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 08/12/21
Where did you see that info. Tre'? My understanding is that there is no direct substitute for the 7199.
Inmate Cleantimestream reports that the 7643 is a sub for the 6GH8A, as does Airtime, using it in his Sherwood S5000, which he converted from the original 7199.
I'm only pointing that out so that someone doesn't invest in the 7643, thinking it's a direct substitute for the 7199, unless you found info to the contrary.
You are correct. There are no direct subs for the 7199. I just didn't know about the 7643 being used (with a rewire) in place of a 7199. That's new information to me.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
"perhaps the best 9 pin pentode/triode ever... {Opinion}." (link to post below)
ask Jim McShane what tube would he use if it was his stereo. That's the extent of my vast tube knowledge - ask Jim.
I'm throwing myself a party.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
and the new a470 output transformer is 4300 ohms primary just like the old one.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I'm looking at the VTA line.... How would I find the impedance of the transformer for the ST120 or the MONO M125?
Each of these amps has multiple tube choices LISTED but like the ST70, one or another may actually be a better match....
Bob Latino has RETIRED and is either messing about in his shop or out fishing......???
Too much is never enough
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