Thread-topic: Interesting early commercially made little "TC's" from Spellman.
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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