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December 02, 2021, 01:24:34 AM

Author Topic: 3A4 tubes  (Read 470 times)

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Offline rangerman

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3A4 tubes
« on: June 01, 2020, 10:36:23 AM »
I picked up some NOS Mullard 3S4 and 3A4 tubes. Can the 3A4 be used in the Quickie?

Thanks, Chris.

Offline Paul Birkeland

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Re: 3A4 tubes
« Reply #1 on: June 01, 2020, 12:18:16 PM »
They look to be pin compatible.  If you plug them in, a DC voltage check will give you some idea about how close they are to each other, as there aren't any triode curves that I can find for the 3A4, and I don't see enough in the datasheets to make a set easily.

I do see that the 3A4 tube will kill off the D batteries twice as quickly as the 3S4 would.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline rangerman

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Re: 3A4 tubes
« Reply #2 on: June 01, 2020, 01:57:49 PM »
Thanks Paul. I’ll give them a try and report back. Cheers!