Site/Book to help me ID the original maker of Re-branded vacuum tubes?

9/6/1999 9:39 PM

Loudernhel

Site/Book to help me ID the original maker of Re-branded vacuum tubes? I have to confess my ignorance on this subject. Up until now I've just bought good NOS tubes from reliable sources and not had to worry about it.         However my new environs are full of thrift stores. Walked away with about 35 vacuum tubes suitable for guitar amps.         Most notable:         2 EL-84'2 marked "Magnavox" but "Made in Great Britain"     26 12AU7a's silk screened "Conn" but etched in two different ways one group has just "12AU7a" and the other has "12AU7a" with a border around it.         The logo with the border around it are identical to a Branded RCA I have so I think they are RCA's but the others?         If anyody knows what the above tubes could be I'd love to hear it but I'm really looking for a pointer to a site or book that will help me figure all this out my self.         Give a man a fish, teach a man to fish, all that.....         regards,     David