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 Post subject: Miller 4526 HV coil spec sheet wanted
PostPosted: Dec Tue 31, 2013 8:07 pm 
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Hi all:

I came across one of the Miller 4526 HV coils but it is missing the spec sheet. Does anyone have the sheet that was packed with the coil? I am looking for a copy or a scan of it. Glad to reimburse copying and mailing costs or PM me for my e-mail address.

Thanks.

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 Post subject: Re: Miller 4526 HV coil spec sheet wanted
PostPosted: Jan Wed 01, 2014 8:48 am 
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Miller used a single double-sided data sheet for both the #4525 and #4526 radio frequency high voltage coils:

Image

Image

Note that the Li’l TC Tesla Coil project employs a slightly different circuit:

Image


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 Post subject: Re: Miller 4526 HV coil spec sheet wanted
PostPosted: Jan Wed 01, 2014 9:01 am 
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Thank you very much Philip. Much appreciated.

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 Post subject: Re: Miller 4526 HV coil spec sheet wanted
PostPosted: Nov Mon 27, 2017 7:07 am 
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That is a TV high voltage power supply. I have two of them in antenna testers.

Same coil. Around the coil, are three 1B3 sockets, each with a one turn field
pickup to light the tubes. The circuit is a voltage tripler , using doorknob
capacitors.

The output goes to a jack on front panel that takes a 1/2 inch banana plug. The test
cable is RG8. The kit has a screw together insulated rod, and the top part is a 10 foot
heavy telescopic whip with a hook.

It runs on 110 VAC, up to 400 Hz. The other power cable is 28 volts DC, which operates
a dynamotor.

It is hooked onto an aerial, (I think on a ship) there is a sensitive relay in the power
oscillator, that closes if the high voltage causes insulators to arc over. This rings a bell.

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 Post subject: Re: Miller 4526 HV coil spec sheet wanted
PostPosted: Nov Mon 27, 2017 7:44 am 
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I wish that I had one so that I could build that Tesla coil. I see that that one diagram uses the 4525 coil which I do have.

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 Post subject: Re: Miller 4526 HV coil spec sheet wanted
PostPosted: Nov Mon 27, 2017 8:51 am 
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I have a feeling that these coils might be considered non-Tesla coils.

An Oudin coil is made to deliver energy at a certain impedance, to transfer energy
more efficiently.

There are also, Spellman High Voltage step up coils, Rated to 70 kV, driven
by four parallel (6L6 ?) . Some look like the Miller types.


The stuff on their web page now doesn't look like what they were hawking 50 years ago.

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 Post subject: Re: Miller 4526 HV coil spec sheet wanted
PostPosted: Nov Mon 27, 2017 6:56 pm 
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One did show up on ebay a few years ago: https://www.ebay.com/itm/NOS-J-W-MILLER ... 1611343076

It probably didn't take too long to sell, so it could be easy to miss. Luckily, it's something that I want but not something that I need.

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 Post subject: Re: Miller 4526 HV coil spec sheet wanted
PostPosted: Nov Mon 27, 2017 7:36 pm 
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If you can't find the coil how about using a TV Horizontal Output Transformer? Frequency won't be the same but high voltage will be there.

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 Post subject: Re: Miller 4526 HV coil spec sheet wanted
PostPosted: Nov Mon 27, 2017 9:13 pm 
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The pi wound coils like to run at about 75 to 300 kHz.

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 Post subject: Re: Miller 4526 HV coil spec sheet wanted
PostPosted: Nov Mon 27, 2017 10:42 pm 
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There are a couple of early televisions that use one of those. Perhaps that could go to an early Dumont or U S Television projection supply. Those are really hard to find. Craig


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 Post subject: Re: Miller 4526 HV coil spec sheet wanted
PostPosted: Nov Tue 28, 2017 12:27 am 
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analog.tv wrote:
There are a couple of early televisions that use one of those. Perhaps that could go to an early Dumont or U S Television projection supply. Those are really hard to find. Craig


There was a big discussion on the forums about that awhile ago. The 4526 didn't seem to be a drop in replacement in the Dumont RA102, at least. Whether or not they could be used in another early TV without extensive rewiring is anyone's guess.

Here is the thread in question: viewtopic.php?f=19&t=307679&hilit=hv+transformer+for+dumont+tv

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