Whats the name of the longer tube in a tube preamp?

ali_x

ali_x

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My preamp is a modded tube preamp (Audio Experience Symphonies Plus R).

Its got 4 tubes, 3 of which are short (ELECTROHOME,PHILIPS 7025, (12AX7) TUBES), which I have bought replacements for for when the current ones expire.

The other tube on the left hand side is slightly longer and im not sure what make it is.

Does anyone know the name of this particular tube (not the make of it) and where to find a good replacement one for when this one dies.

Plus are they expensive?...

Alex.
 
Likely as tube rectifier and not expensive.
Should have some markings on it.
 
The Symphonies, pure tube preamplifier reveals crystal clear details, eloquent musicality, with absolute neutrality.
(3) 12AX7A vacuum tubes are used in the stage and a one 6X4 for the power supply.
 

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