What do you know about the 23D4? - diyAudio
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Old 16th September 2009, 01:50 PM   #1
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Default What do you know about the 23D4?

I picked up close to a cubic yard of tubes at a sale a while back and just yesterday I discovered some Amperite 23D4 triodes. At least I think they might be triodes.

They have Octal bases and are about the size of a 100watt bulb.

None of my manuals mention this tube and I have not been able to search for anything useful. (It doesn't help that Lucas made a distributor with that designator)

Anyone familiar with these?
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Old 16th September 2009, 02:28 PM   #2
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Location: Macedon NY
Amperite made ballast tubes and delay relays - either should be fairly obvious.
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Old 16th September 2009, 05:22 PM   #3
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23D4 is a ballast tube, like a light bulb carefully engineered as a current source.
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