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Author Topic: RCA - BTA-250M - 75 Meter - 250 Watt AM Transmitter & Collins R388-URR Receiver  (Read 605 times)
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W5AHN
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« on: December 18, 2023, 06:15:35 PM »

As Shown on Ebay - https://www.ebay.com/itm/276234522073

From the estate of Jack Sellmeyer P.E. - AD5VO - Well Known Broadcast Consulting Engineer

This transmitter was Jack's personal RCA BTA-250M 75 - 80 Meter AM Ham Transmitter.

In it's prior life, it was broadcasting music and news on the AM Broadcast Band.  

After the transmitter was removed it from commercial service, Jack professionally converted this beautiful RCA 250 watt AM Transmitter to operate on the 75 meter radio amateur band.

RF Finals are a pair of 813 tubes - being Plate Modulated with another pair of 813's.  

And as you can see, there is a large box of spare tubes, including multiple 813's, 807's and other driver tubes to keep this transmitter in service at your shack for 50+ years.

Jack modified this transmitter to be driven with a RF synthesizer that he built.  

By simply dialing up the 75 meter frequency on his synthesizer, you can easily operate on any 75 Meter frequency that you want to talk on.  See details of the synthesizer in the pictures.

Also included in this sale is Jack's personal Collins R-388 / URR Receiver so you can receive the guys that you are talking to on this Beautiful RCA BC-250M 75 meter AM transmitter.

Jack's synthesizer and Collins R-388 will come installed in the rack 19" cabinet that you see in the pictures

If you want a commercial AM Transmitter operating on 75 meters - you will want this beautiful RCA 250 watt AM transmitter.

Jack Sellmeyer was a well known AM and FM Broadcast Consulting Engineer, who lived in McKinney, Texas, who recently passed away.  

You can read about Jack, his vast knowledge about RF, electronics and the contribution that he made to the Broadcast Industry in the articles from the links shown below!

https://www.radioworld.com/news-and-business/headlines/jack-sellmeyer-accomplished-engineer-and-consultant-has-died

https://www.turrentinejacksonmorrow.com/obituaries/js-jack-sellmeyer

https://www.thebdr.net/jack-sellmeyer/

And, in the lower part of this article, read about Jack's RCA 50F 50,000 KW AM Transmitter at: http://www.j-hawkins.com/wknr.html

Also, on David Gleason's excellent web site "World Radio History" - David is working to scan a large quantity of Jack's personal manual collection of manuals and posting them for all of us to enjoy and have access to at:  

https://www.worldradiohistory.com/Archive-Catalogs/Sellmeyer-Librarry.htm
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