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In Reply to: RE: EI-625 Lam Outputs posted by OldNuke on August 26, 2016 at 20:46:19
I don't recall anything, but if you can find or quote the reference to me I might be able to clarify.
FWIW the stock (Bottlehead) Mainline outputs use EI75 lams, nominally 4K primary impedance. This is the same size as Mike's excellent EXO-35/36 and EXO-45/46 outputs, which are spec'd at 2.5K and 5K ohms.
Follow Ups:
Hi Paul,
You mentioned a stack size and info after Mike mentioned he had these vintage low nickel lams and needed to complete the design and get them in the catalog. Copy below:
Posted by Paul Joppa (P) on February 18, 2015 at 19:22:01
In Reply to: Teaser Post posted by mqracing on February 17, 2015 at 00:57:27:
You know, Mike ... a 1.25" stack of 0.625 lams is about the same area as an EXO-35, and the same core geometry as a TFA-204. Just a thought ... :^)
I like the other vintage items I've gotten from Mike and thought these would be a good one to try to design a headphone amp around.
My Mainline is finished (never to be touched as to not let out any magic dust) with TL-404's in it. I have a 45 SET amp with Mike's EXO-45, well they are 145's with Litz wiring.
I was just making a somewhat goofy idea. The TFA-204 is a slightly unusual core geometry, the stack is twice the leg width. There is a theoretical reason to choose that, but as Mike says it's only one of many considerations.
In case it's not clear, the 625 just means the leg width is 5/8 inch. There is no other magic to it!
No worries, I didn't expect it to be a given idea. Experimenting with different things is how we find that magic combination. It's not guaranteed to be good but it's not guaranteed to be bad either.
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