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In Reply to: RE: Valvo 6201 What do I have? posted by FenderLover on December 23, 2016 at 18:05:36
The 6201 is an industrial version of the 12AT7. As i recall the Blue Label Valvo, is designed for medical or high reliability 10,000 hour instrument use. I would have to dig mine out of storage but if they were not made in Holland i think they were made in Germany by Siemens. If Siemens they would have an "SH" which looks like an S with an = sign thru it. Excellent audio tube. Not quite an ECC801S more of an E81CC.
Follow Ups:
Also, I appreciate your input gentlemen thank you
if it has a printed white "D" in bottom between pins it is sure original VALVO/Hamburg made. my experience says that all pinched waist VALVOS (very early vintage types) were made by VALVO.the colours (green/yellow/red/blue) show the former distribution channels. the destiantion of yellow ones was german postal/broadcasting supply, green for calculators/computers, blue for avaiation an seafaring purposes and red for other common technical use.
a coloured VALVO is not a guarantee for perfect sound at all. i tried several blue 6201 types in phase converter position of my preamp and was disappointed from their performance. i found far better canditates (ECC81 made by RFT and Telefunken). sorry!
N.
"Science just illustrates the current state of errors"
Edits: 12/24/16
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