Hi Steve,
I got the pictures from the other site for here :^)
THANKS for these. These definitely are very neat little coils.
Steve's Miller coil, early TV application, data sheet:
https://photos.app.goo.gl/RwBnCt6VHMB9eeSK6
Definitely some neat coil history here and yes, great memories for you :^)
Chris Reeland
Ladd Illinois USA
Sent from my Samsung Galaxy Tab® S
On Mon, Mar 1, 2021, 1:20 PM Steve White <steve.white1@xxxxxxxxx> wrote:
> Hi Chris,
>
> Great info on the Miller 4526 RF transformer. I have since found a picture
> of one actually installed on the chassis of a Dumont model RA-102HVT
> television so it turns out that at least one application was indeed for
> TVs. I believe that it was made in the late 1940s. Unfortunately I can't
> post it on here. I also have the data sheet for the Miller 4526. It
> includes a suggested circuit application.
>
> I still have my Li'l TC coil and it still works with all the original
> parts 52 years after I built it. I also still have the Popular Electronics
> July 1964 edition that I bought new when I was 11 years old. This is where
> I got the plans and idea for building Li'l TC. This is what got me started
> with the HV bug.
>
> Great memories!
>
> Steve White
> Cedar Rapids, Iowa
>
> ----- Original Message -----
> From: "Chris Reeland" <chrisreeland@xxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Monday, March 1, 2021 2:48:07 AM
> Subject: [TCML] Interesting early commercially made little "TC's" from
> Spellman.
>
> 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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