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In Reply to: RE: No Way posted by tvr2500m on January 13, 2016 at 14:13:29
For what those XF1's are worth you might be able to get 2 sets of XF2's and they're real nice.
Just a thought.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
Are you saying the tubes won't fit in the EL-34 sockets or that they can't get beyond the cutouts for them leading to the sockets?
Well it is certainly a treat to have tubes with a really certain pedigree. I really can't think of a truly logical explanation but ...Glass is a technically a fluid and does settle over time due to gravity.
(warning bad joke) Do you think the tubes are excited about being used and thus gotten hotter and larger? Tube Tumescent Syndrome?
The Mullard el34 FX1 has a larger base (shown above) than the later tubes, including the FX2.
With the later tubes the base is only slightly larger than the glass (shown below).
The posters problem is the larger base of the FX1 won't fit through the hole in the chassis to allow the pins to reach down to the circuit board mounted tube sockets below.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I thought that he said they were the same tubes and same socket cut out, as the ones tried when new. Obviously that is not the case.
He said, "I have an excellent set of Mullard XF1s (same date codes, same measurements out of my testers, super low hours, Blackburn, Dynaco silkscreening; they have dual o getters) from my father's Dynaco ST-70 he built new in the early 1960s and I've used for short periods myself."
He just got the amp in question. I'm sure he meant that he had use these Mullard tubes in other amps through the years but when he try them in the new amps....no go.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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