Pushpull output iron : any schematics out there for a split bobbin design ?

RE: Pushpull output iron : any schematics out there for a split bobbin design ?, posted on March 14, 2015 at 15:14:16
PakProtector Audiophile Posts: 12365 Joined: May 14, 2002	I will have something like this as soon. It is only a 5k a-a. Can send you an x-ray of it before it unwinds itself...:) cheers, Douglas Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.

RE: Pushpull output iron : any schematics out there for a split bobbin design ?, posted on March 14, 2015 at 16:52:22
Paul Joppa Industry Professional Posts: 7296 Location: Seattle, WA Joined: April 23, 2001	Is this a question about amplifier design or transformer design?

RE: Pushpull output iron : any schematics out there for a split bobbin design ?, posted on March 15, 2015 at 00:16:53
Al Noakes	It's the transformer design I'm after . Quite a lot of info on transformer winding but not very much WRT split bobbin transformers Al

RE: Pushpull output iron : any schematics out there for a split bobbin design ?, posted on March 15, 2015 at 00:19:18
Al Noakes	I'm hoping my winder is familiar with such a design but if you have an x-ray , that would be useful Al

RE: Pushpull output iron : any schematics out there for a split bobbin design ?, posted on March 15, 2015 at 23:59:37
Paul Joppa Industry Professional Posts: 7296 Location: Seattle, WA Joined: April 23, 2001	There is some information in RDH4 (Radiotron Designers Handbook 4th edition). Norman Crowhurst may have written some if you can find his magazine articles - I don't remember offhand.

RE: Pushpull output iron : any schematics out there for a split bobbin design ?, posted on March 22, 2015 at 09:16:53

mqracing
Manufacturer

Posts: 4323
Joined: June 29, 2000

Check out DT Williamson's original article. He gives complete instructions for the design of his chosen output transformer which was a twin coil type as you are asking for.

Williamson's output had (by memory) a 10K anode to anode pri impeadance. But you (or your builder) should be able to ratio it down to 8K and get the right number of turns and calculate out the correct wire size.

If you could ever find some... the Freed QGA series were all built on EI's with a double (side by side) bay winding arrangement.

Good luck with your project,

MSL

Builder of MagneQuest & Peerless transformers since 1989

Tube DIY Asylum

Pushpull output iron : any schematics out there for a split bobbin design ?

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