3A4 tubes

[rangerman]

I picked up some NOS Mullard 3S4 and 3A4 tubes. Can the 3A4 be used in the Quickie?

Thanks, Chris.

[Paul Birkeland]

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.

[rangerman]

Thanks Paul. I’ll give them a try and report back. Cheers!