Are these Mullards 12at7/ecc81's a good vintage?

Tubes Asylum

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Looking to do a little tube rolling in an Audio Mirror PP1 preamp which uses RFT ECC81 tubes stock in the line stage.
Have had a few tubes recommended to me (am open to any ideas).
One of them is the Mullard 12at7/ecc81's.
In reading about them, it appears there are a lot of versions or at least vintages of them.
These particular ones are allegedly 1983-84.
Any comments on these?
Any recommendations on other places to buy these at a decent price?
Other recommendations on 12at7/ecc81 tubes are welcome.
Allegedly the unit will also take 12au7's in these slots.
I am using Odyssey Mono Extremes amps/ACI Jaguar monitors/ACI Titan subs, and a TRL modded SOny 900 source.
Thanks for any ideas-I am a tube novice so appreciate the help on this forum a lot.

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Topic - Are these Mullards 12at7/ecc81's a good vintage? - LKDog 11:54:11 03/25/07 (2)

Re: Are these Mullards 12at7/ecc81's a good vintage? - tvad 15:28:17 03/25/07 (1)

Re: Are these Mullards 12at7/ecc81's a good vintage? - LKDog 07:52:36 03/26/07 (0)

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