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When you have a moment and are feeling up to it:
Markings:
60 MADC
10x10 TFA
204 NAG
TFA 204. Nickle. Airgapped. Right? What does the 10x10 mean?
Hoping you heal up quick!
There is a crack in everything, that's how the light gets in.
—Leonard Cohen
Follow Ups:
I can confirm that the NAG stands for "nickel air gapped"...
the 10X10 would have indicated that the lams were stacked alternately(i.e., interleaved) in groups of ten...
but your units are NOT stacked 10x10--- they are butt stacked with an air gap spacer--- hence you see the straight line all the way across the stack where the E's butt up against the I's.
best I can figure is that I may have initially planned on stacking the core 10X10.. and then changed my mind and went with a gapped butt stack...
Stacking 10x10 introduces an airgap into the core... but not as large a gap as a butt stack with an added spacer works out to bee.
Cores that are not intended to have an air gap are usually stacked 1x1--- one by one gives you the least amount of airgap and optimizes the effective perm of the core--- so-- say in a push pull output trans you might go with a one by one stack. One by one keeps the interruption of the magnetic circuit to a minimum.
As a side note--- and something I've thought a lot about and have wanted to write about is--- for all the cache of "c-cores" being hip and efficient--- they more closely resemble the butt stacked EI lams in the sense of they have "large" effective air gaps vis-a-vis what can be obtained with carefully stacked EI laminations.
Your pair of 204 NAG's are really numerically quite rare... we've maybe made three or four pairs of these (by memory) over all of the 22 or 23 years that I've been making transformers.
Enjoy.
MSL
Builder of MagneQuest & Peerless transformers since 1989
Thanks for the detailed response, Mike, especially in light of your surgery!
All I can say at the moment is that these are quite special. A friend and
I spent an entire afternoon mesmerized by these Wright's. The best I can
do, at the moment and in terms of a succinct impression, is to say that
they combine the sweetness of a 300B with the clarity and extension of
a 2A3. Well done!
There is a crack in everything, that's how the light gets in.
—Leonard Cohen
I'd be curious what your impression of the bass is in the deepest registers--- that would or should be the achilles heal of the TFA-204 when deployed as an airgapped trans--- it's primary L is less than what I would like it to bee.
cheers and thanks for your expressions of good will.
MSL
Builder of MagneQuest & Peerless transformers since 1989
Mike,
I don't know how an air-gapped nickel core would affect things, but the standard TFA-204's have solid bass in the little Wright amps. Better than one would expect given the size and inductance ratings. And of course, the rest of the frequency range is just lovely.
Kyle
Hi Mike and Stephaen: I gather the laminations are permalloy. In the horn systems Stephaen and I are using (two very similar systems)we use the Wright 2A3 amps from 350 Hz to 6 kHz. For that reason, bass response of the amp is not the concern it would be in a full range application. I was with Stephaen during the mesmerizing session, and agree with Stephaen's description of the sonic results. Is it possible for you to fabricate for me a pair of transformers identical to Stephaen's? I'm gonna cry if you say no.
I guess I should have chosen a better word than extension, as I wasn't
talking about top to bottom FR. It would hard to speak to the question
of the deepest registers as my amps are being used exclusively for the
midrange in a tri-amped, horny system.
Perhaps better words, in addition to sweet yet clear, would have been
broader tonal expression, a more expressive tonal reach, in the midband.
Your comments do encourage me to (when I find the time!) give those
amps a try on my passively crossed homebrew version of the Altec 604
(in 9 cf boxes). That would allow me to respond to your query based on
my long-term experience with them. Thanks for additional info!
There is a crack in everything, that's how the light gets in.
—Leonard Cohen
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