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Opinions wanted re: Jac Music 6EM7-300B

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Posted on April 10, 2022 at 13:54:18
dcal40@aol.com
Audiophile

Posts: 45
Location: NY
Joined: July 30, 2016



Has anyone built this circuit? if so, opinions wanted. How does it compare to Frankenstein2 which utilizes an IT between Low mu section of 6EM7 and 300B. How does this stack up vs. cascade/cascode and pentode driven 300B?

 

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RE: Opinions wanted re: Jac Music 6EM7-300B , posted on April 10, 2022 at 14:09:04
Triode_Kingdom
Audiophile

Posts: 10049
Location: Central Texas
Joined: September 24, 2006
 I think the sonic results will be highly dependent on component quality and synergy. In fact, that will have a much bigger impact than actual topology.





 

RE: Opinions wanted re: Jac Music 6EM7-300B , posted on April 11, 2022 at 07:55:49
PakProtector
Audiophile

Posts: 12366
Joined: May 14, 2002
 Implementation...yes. Especially if a pentode driver is used. Can be really good, but mismanage/mis-match g2 voltage to the load and all bets are off.
cheers,
Douglas

Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

 

RE: Opinions wanted re: Jac Music 6EM7-300B , posted on April 11, 2022 at 11:19:43
Oldbean2
Audiophile

Posts: 928
Location: Midwest US
Joined: March 27, 2022
 personally, I would ditch the 1st section of the 6EM7 and rework it with 6J5 (or half of a 6SN7). You don't need as much gain as the first section provides, and I think the 6SN7 type sounds better. It's the low mu section that is the star here.

I have worked up a PP 300b design with a 6J5/6EM7 (low mu section only) driver with an interstage after the 6EM7 to couple and split phase. Maybe I'll have time to build it when I retire...

Back for a bit again. Ignore me if you like.

 

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