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RE: details

62.216.150.52

In Reply to: RE: details posted by gluca on October 13, 2012 at 10:59:45

Just curious... why did you use the MQ565 instead of perhaps say a S240 trans for the push pull?

Looks fantastic.

Cheers
Frank M

Follow Ups:

RE: details - mqracing 19:13:56 10/20/12 (1)
Hi Frank:

The S-240 does NOT have screen taps--- so if someone were building an amp with EL-84's and wanted to go UL the 240 is not an option--- plus the 240's pri impedance is too low for most EL-84 apps that I've seen.

Don't shortchange the orig dyna 565 design--- it's actually a pretty good design and one of the best for EL-84's if your building UL. Dyna actually ran the core conservatively and the UL taps have very good AC symmetry--- which a lot of other ul tapped outputs do not have as well.

Norman Crowhurst wrote an article on optimizing an amp with UL taps and explains the need for AC symmetry btwn the two opposing taps.

MSL

Builder of MagneQuest & Peerless transformers since 1989
- Thanks Mike.. - Frank Mena 07:14:57 10/22/12 (0)
  My confusion in Gluca's post was with the VT52 tube as I always thought it was only a pentode tube . However a little digging led me to seeing there are two different versions with the same name, one British (pentode) and the other American (triode). So that is why he could substitute tubes like the 2A3 in his circuit. Gluca's stuff is really facinating for me.
  
  In any event, I am still going to build the Baby Huey (link below) with the EL84 and your MQ565 which can use the UL taps. It will be my first scratch build and my thought was why not start off right with the really good stuff!! (MQ565)
  
  Cheers
  Frank M
  - Baby Huey (Open in New Window)
RE: details - gluca 12:31:34 10/15/12 (0)
the project started with EL84s and evolved towards VT52 as i found a nice quartet along the way

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