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Re: [TCML] Interesting early commercially made little "TC's" from Spellman.

Chris R
I found it very interesting thanks. I have that mag too. Have built a few
coils but want to try some tube coils too have a big 81M with socket to try
next. Have some of the coil from the article.

On Mon, Mar 1, 2021 at 5:36 AM Chris Reeland <chrisreeland@xxxxxxxxx> wrote:

> Hi all,
> I recently came across some interesting coils from my 1965-66 EEM Catalog
> that I have also fairly recently aquired. Aquired several years actually.
> What tremendously wonderful huge catalogs these are. I am still going
> through them a little at a time. Just all kinds of wonderful information of
> stuff past. Been meaning to post this, and now finally got to it.
> I came across this Spellman section stuff and I was "stopped dead in my
> tracks".
> And instantly thought of Steve White and his Li'l TC. I remember him
> commenting somewhere along the lines, there was not much information on the
> coils, specifically the Miller coil form itself and it's interesting
> construction. While these are Spellman's, a couple models look very close.
> And there are a couple other interesting models here. And he questioned
> other possible uses. The Li'l TC article says for large TV screen use, but
> I am not sure this was completely accurate at the time. Maybe as direct
> replacements for much older TV's. I am pretty sure 1965-66 TV's made were
> all flyback transformers, even before this date. I know they used these
> types of coils in the very early TV's, but flybacks got delvoped not too
> long afterwards and I thought pretty much phased these types out. Well
> Spellman had other uses as seen in pictures for high frequency (RF)
> rectified DC power supplies. As true for the time most are vacuum tube
> circuits.
> But check out one page, an early transistor type coil!
> Recently I tried looking for more information online and there is still not
> much out there at all on the Miller version of these coils. Very little.
> And I could not find anything on these Spellman's.
> Well I hope some find this interesting as I did.
> Pretty cool that you built a VTTC using one of these coil types "actually
> back in the day", Steve.
> A couple of pictures links:
> Li'l TC:
> https://photos.app.goo.gl/mPnxKyig4K3NXX3P6
> Spellman's:
> https://photos.app.goo.gl/XLnzkiP6sgi1U6Vy9
> Chris Reeland
> Ladd Illinois USA
> Sent from my Samsung Galaxy Tab® S
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