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RK-715

 
    
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The RK-715 is a power tetrode of the late 1940s. The datasheet for the 715C is the closest match we could find. The RcA transmitting tubes manuals of the time do not list this valve.
The 715 was designed for pulse operation as a modulator.
This valve is unusual in that it features four flat oval cathodes side by side. The control grid appears to be gold plated and is stretched in front of the cathodes on notched rod supports. The screen grid is a flattened helix. The anode is supported on ceramic insulators and connected to the top cap. This suggests a high anode voltage. The anode itself is of substantial construction 1 mm thick, and is blackened to radiate heat. The four stud pins of the base are suited to sprung connectors. Please note that our pin numbering follows the UK pattern and the RCA data-sheet is different.
The wide glass tube envelope is 60 mm in diameter and, excluding the B4A base pins, is 136 mm tall.
Reference: Datasheet.

 

Pin Connections
B4A
1
2
3
4
tc
h
g2
g1
h,k
a

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
26
2.1
15,000
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated November 27, 2013.
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