Found NOS 12AX7

I don’t think you have to bias that particular tube, do you?

If not, I’d swap em and and report the findings here.

Hang on a bit and folks who know more than me will weigh in.

 

No need to bias a 12ax7 in that application.

 

I got some vintage RCA 12ax7 tunes and put one in my Milkman amp and it made enough difference that my wife noticed. I would highly recommend it in the amp

 

UOS...not NOS. If it is in a circuit, it is a used tube. Since it is in a pedal and perhaps being used at low voltage, it might be ‘as new’, but NOS it cannot be.
Would I want it in an amp rather than a pedal? Probably...but that choice would be made based on Sonic results.
Got a picture or two of the tube? Featuring the codes if any are present?

 

It's not hard to swap it into the amp, so why not give it a whack? If you hear a difference, and you like it, you win. If not, no harm done.

 

FYI: Most, if not all, tubes labeled "England" are NOT made in England. Mullard, Brimar and Genelex were all labeled "Great Britain."

Years ago I bought a sleeve of RCA 12ax7 that were labeled England and were actually EI's made in Yugoslavia. I believe that's what you have.

 

^^^^^^which is why I asked for pics if available.

 

EI 12ax7/ECC83's' have smooth plates, a large ring getter, round mica spacers and a seam on the top of the tube (like a Philips made tube). They do sound good if you get one that isn't microphonic, which many are.

 

That's very cool. I just ordered some NOS E I tubes myself. I also intend to put them into a tone king Gremlin (in place of the TAD 12ax7a-c) tubes that came with the amp. I am curious to see if it turns this already great amp into something even more special.

 

Nice rugged one.
Cant tell if short plate or long plate.

 

That is, I believe, considered a long plate design. Or at least mid-long.

 

Westinghouse bought their 12ax7 tubes from different manufacturers. I have a couple with
"Made in England" that also have the Soviet star on them.

If made by Mullard said to have the factory code etched into the tube glass.
Also said Westinghouse relabeled Yugo EI or Tungsram tubes. There was a lot of fake
COA branding done in the cold war era on non US tubes since the US would not buy
from Russia but then in the late '70s US tube manufacturing was shutting or sold to
off shore companies so between a rock and a hard place.