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Raytheon RK-65 Tubes

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Author Topic: Raytheon RK-65 Tubes  (Read 1845 times)
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« on: September 07, 2011, 07:58:22 PM »

I have just been given a pair of Raytheon RK-65 tubes. What a classy looking bottle!
Filaments have continuity with no shorts between any of the elements. Haven't tried to light them as I don't think I have a fil tranny that would handle them. Glass is not discolored and they have sockets with them.
Can only find one fairly good tube data sheet on the web and so far have not come up with any suggested circuits or projects for them. The old handbooks I have (either coast) don't have anything much on them either. I think the Navy used them in a ship to shore transmitter.
Any one know anything else about them?



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« Reply #1 on: September 07, 2011, 08:11:40 PM »

I've heard them described as 813's on steroids. Or 1 1/2 times an 813. Probably could be used in a similar way.

There is a guy on ebay offering a data booklet. It's cheap and might be worth getting.


Also, there are a couple rk-65s for sale on ebay. That's kind of unusual as they rarely come up. Maybe get a spare or two???


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« Reply #2 on: September 07, 2011, 08:46:31 PM »

Looks a lot like the RCA 806! Just looked up an 806 and it's not like your tube not that any of this matters, but I wanted to correct my post for what it's not worth Grin Grin

But anyhow there is another OB tube out there that looks like it and I will find it someday.

The secrecy of my job prevents me from knowing what I am doing.
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« Reply #3 on: September 08, 2011, 08:23:21 AM »

>From the 1950 ARRL Handbook

RK65 Plate dissipation 215 watts, filament 5volts 14 amps, max plate volts
3000, max screen volts 500, max screen dissipation 35 watts, grid to fil
capacity 10.5pF, grid to plate capacity 0.24pF, plate to fil capacity 4/75pF,
Max freq full ratings 60Mc.

Typical operation Class C amp telegraphy Plate volts 3000, screen volts 400,
grid volts -100, plate current 240mA, screen current 70mA, grid cvurrent 24mA,
approx grid driving power 6.0 watts Approx output power 510 watts.
Typical operation Class C amp telephony Plate volts 3000, screen volts left
blank, grid volts -150, plate current 200mA, screen current 70mA, grid cvurrent
22mA, approx grid driving power 6.0 watts Approx output power 380 watts. Screen
dropping resistor 30,000 ohms (presumably from modulated plate supply).

Todd, KA1KAQ

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« Reply #4 on: September 10, 2011, 12:44:50 AM »

Nice gift, Bill. Sounds like the basis for a good winter project?

known as The Voice of Vermont in a previous life
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