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Author Topic: RCA 813 150 watt oscillator  (Read 13582 times)
K1ZJH
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Posts: 1087




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« Reply #30 on: November 14, 2011, 09:28:15 AM »

Ross also build the huge remote controlled airplane (glider??) that graced the ARRL museum back in the
sixties. A true homebrewer and experimenter.

Pete
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N2EY
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Posts: 3895




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« Reply #31 on: November 14, 2011, 09:59:53 AM »

Check this out:

http://www.qsl.net/kd7nrq/RCA63_71.pdf


73 de Jim, N2EY
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VA3AEX
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Posts: 22




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« Reply #32 on: November 17, 2011, 08:06:45 AM »

Jim, link you attached shows the Page is under construction.  What was in it? de alex
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N2EY
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« Reply #33 on: November 17, 2011, 08:30:26 AM »

Jim, link you attached shows the Page is under construction.  What was in it? de alex

An updated version. RCA showed a design using a 6V6 oscillator driving the 813, with more power input (360 watts!) and output. This solved some but not all of the issues.

73 de Jim, N2EY
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K1ZJH
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« Reply #34 on: November 21, 2011, 09:38:16 AM »

Check out the N4TRB.com website. Many of the RCA Ham Tip newsletters are archieved there. A virtual
homebrewer's dream. Those were good days.

Pete
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AE6ZW
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« Reply #35 on: November 25, 2011, 11:56:58 PM »

one time some where , I read article about making clean low phase noise OSC.  it was consist of tube / crystal oscillator.  and its output was around 1 watts.   I am younger engineer, so I never build any Xtal OSC more than 1 mW output, usually less than 0.1 mW output because usually small coupling to next stage.  so, idea of getting 150 watts output fascinate me very much.
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K9MHZ
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Posts: 425




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« Reply #36 on: November 27, 2011, 07:01:49 PM »

I messed with a lot of one-tube wonders back in the 70's, and never found even one of them that was anything close to stable when keyed down.  Probably just me, but coupling an oscillator directly to an antenna was always a real disappointment.  Tried a couple of multi-stage designs to relieve the stress on the oscillator plate and they were always significantly better.

FWIW, YMMV, no animals were harmed, other usual disclaimers.

Best,
Brad, K9MHZ

 
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GILGSN
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« Reply #37 on: December 31, 2012, 04:05:44 PM »

Quote
An updated version. RCA showed a design using a 6V6 oscillator driving the 813, with more power input (360 watts!) and output. This solved some but not all of the issues. 73 de Jim, N2EY

Hello, so, is there a schematic somewhere?

Thanks,

Gil.
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N3QE
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« Reply #38 on: December 31, 2012, 08:13:35 PM »

RCA put "ham-like" circuits in QST etc but mostly as an advertising medium to get the tubes into the hands of someone who might work in broadcast or industrial fields.

Didn't the 813 in a circuit something like this (no crystal, just LC tank) end up being used in Raytheon and maybe some other brands diathermy machines? Those are interesting power oscillators. What we hams would call "an undesired parasitic" in an amp, are the modus operandi of a diathermy machine.
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GILGSN
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« Reply #39 on: December 31, 2012, 08:19:42 PM »

I have one schematic by RCA with the 813. It requires a keying relay, since there would be otherwise 1500VDC on the key... Just one tube. I was just wondering if there was something more "civilized" available, two tubes... As Jim N2EY mentions...

Gil.
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N3QE
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« Reply #40 on: January 01, 2013, 08:26:32 PM »

I have one schematic by RCA with the 813. It requires a keying relay, since there would be otherwise 1500VDC on the key... Just one tube. I was just wondering if there was something more "civilized" available, two tubes... As Jim N2EY mentions...

For several years in the 50's ARRL handbooks, there was an all-band CW transmitter which was very nice.

It had a VFO, remote VFO knob, it had many tubes for doubling/tripling as power levels went up, had a 12AU7  and it had a 7094 in the final. 7094 was run at 1500V and rated just a little higher than an 813.

"A Self-Contained 500W Transmitter", page 191, 1959 ARRL Handbook.
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GILGSN
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« Reply #41 on: January 01, 2013, 10:30:13 PM »

Quote
It had a VFO, remote VFO knob, it had many tubes for doubling/tripling as power levels went up, had a 12AU7  and it had a 7094 in the final. 7094 was run at 1500V and rated just a little higher than an 813.

Thanks. Sounds awesome, dangerous and complicated  Wink I will check it out, if I can find it. I only have the 1941 book..

Gil.
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