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In Reply to: Mullard 12AX7 posted by OLLY on August 12, 2002 at 17:24:55:
Olly,If it sounds good to you, it is good. Don't worry about the date codes. AFIK you can't hear them. Worry about them if the tubes start saying 'Blackburn 1957 from the right channel and Blackburn 1959 from the left'.
Follow Ups:
Les I always let my ears decide what I prefer to listen to and these 17mm plate Mullard ECC83's are certainly the best I have ever heard on my system.The more I listen especially to vinyl the more I come to appreciate how good these are. But what I would like to know is why they had different codes for basically the same valve.There must have been a reason to have the two codes and when I come across something like this it's my basic instinct to ask "WHY IS IT SO".Someone may have an answer.
OLLY
Hi,If one looks at the paper at "triodeel" it should probably be I6 (ECC83) version two and F9 (ECC83 low microphonic) version two.
As both are -59 (???) blackpool I suppose they are the same just at deifferent ends or run of batches. But that is a guess on why they are differently marked.[But say - guess, or make up :-) - they are more "low mic." at the start of the run - or whatever - and that one batch ended in january theese may be marked I6, and then they started a new batch in june - or whatever 'E' means - which was marked higher quality (F9 - low mic.). Would such a ad hoc make sense?]
Hey Par, Thanks for that bit of info. I'll take it as gospel as I don't know any better. All the f92 valves have 17mm plates and the 162 valves have 14mm plates if thats of any help. I do not know if that means anything but I do know as soon as I plugged on in on Saturday my mate who was here grabbed one of the 17mm plate ones as he was so impressed with its qualities.
OLLY
Hi,So they did differ externally as well :-)
That explains the two different denominations (I6 and f9) and makes my gospel void.
Ordinary ECC83 and low microphonic ECC83 used different tools then, and so had different type numbering :-)
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