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713A / 717A Valve Applications?

post #1 of 2
Thread Starter 

Ahoy,

 

I recently came across a box of the Raytheon 717A tubes. A simple pentode synonymous with the VT-269 tube. Though I know it's not good criteria for selection I love their appearance: A smooth flattened bulb with a sideways plate assembly in the middle (picture below). Looking up the datasheets they seem vaguely similar to half a 12AX7 tube. 

http://frank.pocnet.net/sheets/127/7/713A.pdf

Does anyone have any experience with these tubes, or possibly guidance/schematics on implementing them in a headphone amplifier? The only use I've seen in an audio amp so far is the Yamamoto A08 and all their products are an order of magnitude over my budget. I can assemble amps but the finer parts of design are far above my skill level.

 

Much obliged.

post #2 of 2

These date from the early 50s. Were used by government in equipment supplied to them at the time as space saving. The anode[plate ] current is very low-7.5MA even in push-pull you wont get much amplification[power gain] out of them Plate Voltage 120. May look nice and I have some UK versions but require specialized circuit for them.

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