Thread-topic: Interesting early commercially made little "TC's" from Spellman.
Great find Chris! Can you determine what sort of transformer is being used to generate the 30 KV? I can see it on the schematic but can't see it in any of the pictures.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "Chris Reeland" <chrisreeland@xxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, March 11, 2021 3:19:09 PM
Subject: Re: [TCML] Interesting early commercially made little "TC's" from Spellman.
Hi all,
Have a bit more to add here on something that happened pretty fast
recently. I came across one these "TC" power supplies from this era.
Price was right and driving distance to get was not too bad. So last
weekend, I went to Flint, Michagan to "save this fella". "I had to have
it!" :^) Especially being mainly a VTTC guy. After all it will be a great
piece of test gear to use. Seller did power this up, and in pictures I saw,
meter did go up and down when he advertised it. Me, I have not powered up
yet. Going to go through everything and check things 1st. Also will be
changing power plug cord. It is shot. Wrapped by someone quite a while ago
with electrical tape from one end to the other. But the high voltage cables
looks to be in great shape. I will test cables with equipment I have to be
safe. Overall physical condition is great!
So here is a link to pictures of my find:
https://photos.app.goo.gl/Pt3PqAdfWgyrkQwD7
The paperwork I got with it do not photo well at all, flash or not, good
room lighting. They appear to be "ditto" machine copies, which are quite
yellowed now. This "TCPS" changed "hands" for whatever reason right away
(was at Iowa Ordinance Plant)... looking at paperwork. Went back to
original vendor of Klaus Radio in Peoria, Illinois. And then who knows
where next? Not sure were seller got, did not ask and truthfully, I don't
think he used it. He seems to be a seller of stuff which is fine. This
paperwork brought me back to when I was very young in the late 1970's. We
had a Klaus Radio branch store in La Salle, Illinois and I remember going
there with my father several times. We lived at the time in neighboring
Peru, Illinois.
While maybe not quite like Steve White's great memories...this was still
cool for me :^)
I will eventually take more pictures and post the little TC and rectifiers
tubes under the protective cover, when I get it apart. This is fairly heavy
and a bit large. This TCPS is mounted inside a nice BUD mini rack mount
enclosure. The protective cover will not come off inside the enclosure,
which is for well high voltage of course, but also to shield RF and the
lower level x-rays being produced by rectifier tubes.
Okay for now...
Chris Reeland
Ladd Illinois USA
Sent from my Samsung Galaxy Tab® S
On Tue, Mar 2, 2021, 2:30 AM Chris Reeland <chrisreeland@xxxxxxxxx> wrote:
> 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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