RCA "Trade Secret" Documents

[Tom9589]

This showed up on eBay yesterday.

http://www.ebay.com/itm/Vintage-RCA-...item1e89cf15db

From the photos, it looks like CRT information. From the dates (1937-1943), it looks like it probably only pertains to B&W tubes, but who knows? 15GP22 secrets?

[Jon F]

That book is really neat, is this something there are other copies of?

Check out his other auctions he has other books for sale, some cool looking early RCA color TV prototypes in this bulletin:

http://www.ebay.com/itm/rca-bulletin...item1e89bc110f

[N2IXK]

Not sure if these are extra copies, or got separated from the rest of the stuff somehow, but most of the RCA standardizing notices and other internal documentation were saved from the dumpster when the Harrison tube plant shut down, and were given to the AWA museum, who loaned them to the Tube Collectors Association. Lud Sibley, KB2EVN, is the current caretaker, AFAIK.

[M3-SRT8]

just out of curiosity, when was the flyback developed, and who developed it?

[David Roper]

Philo Farnsworth patented the principle in the late 30s IIRC.

[Electronic M]

IIRC a pre-war German set was the first consumer product to employ a flyback...I think it was the first rectangular CRT set too...

[Sandy G]

Pretty sad when a once-MIGHTY corporation's Valuable Documents are sold for pennies on the dollar like that...Even if it is something that's virtually worthless & obsolete..

[stromberg67]

Originally Posted by Sandy G

Pretty sad when a once-MIGHTY corporation's Valuable Documents are sold for pennies on the dollar like that...Even if it is something that's virtually worthless & obsolete..

So true. I'm still wondering what happened to all of Stromberg Carlson's files when they cleaned out the plant in Rochester. I believe some things were saved, but how much is anyone's guess.
Kevin

[Steve K]

Tom:

You are correct about the German set. It was the E1 of 1939. There is a link to it on the ETF site.

Steve

[old_coot88]

This is so reminiscent of the demise of Republic Aviation, the once great supplier of planes like the legendary P-47 Thunderbolt fighter of WW2...
http://www.airspacemag.com/military-...lded-69197851/

[Jon A.]

So, am I right in assuming from this discussion that sets using AC high voltage do not have anything resembling a flyback?

[David Roper]

They're usually referred to as having 'mains-derived' high voltage, borrowing a phrase from the brits, or else 'brute force' high voltage. They use an ordinary step-up transformer that steps the voltage wayyyy up. So yeah, no flyback action.