Made in USA by W.E.
One of special nine pins full-wave rectifier tube.
Black plate, D-Getter
Perfective for Pre-amplifier. Data here.
Nos in original box. Matched pair are available.

Made in G.Britain (1970s). 
Large body, Ribbed Plate, Side Disc-Getter, Brown base. 
Same as 5U4GB tube. Greatest rectifier tube in the world.
Nos but no box. Never been used.
Matched pair are available.

Made in G.Britain (1970s). 
Large body, Ribbed Plate, Side Disc-Getter, Brown base. 
Same as 5U4GB tube. Greatest rectifier tube in the world.
Nos in box. Never been used.
Matched pair are available.

Made in United States by RCA (1950).
This Full-Wave vacuum rectifier is the first type of the Special Red Version from RCA (5690 - 5691 - 5692 - 5693) with large red base, Triple mica and four D-Getter. Looks very reliable. Verry hard to find now.
Nos in original box. Matched pair are available.

Made in USA by Bendix. 
One of the best tube in 6X5s family BUT please pay attention to this type. It need 1.2A for Heater Current (not 0.6A as 6X5 tube). Long life and very good for replacing 6X5 Rectifier in most of Audio-Note Preamplifier. Warm-up time = 60 seconds. Very safe for High-End Systems. Geat sounding with very ascendant bass. Nos in original box.

Made in USA by Bendix. 
One of the best tube in 6X5s family BUT please pay attention to this type. It need 1.2A for Heater Current (not 0.6A as 6X5 tube). Long life and very good for replacing 6X5 Rectifier in most of Audio-Note Preamplifier. Warm-up time = 60 seconds. Very safe for High-End Systems. Geat sounding with very ascendant bass. Used but test good..

Made in USA by Bendix. 
One of the best tube in 6X5s family BUT please pay attention to this type. It need 1.2A for Heater Current (not 0.6A as 6X5 tube). Long life and very good for replacing 6X5 Rectifier in most of Audio-Note Preamplifier. Warm-up time = 60 seconds. Very safe for High-End Systems. Geat sounding with very ascendant bass. Nos in original box.

Made in G.Britain by Mullard.
This is the first 5AR4 / GZ34 ever made by Mullard. Fat Base and Double O-Getter.
It is F31 Seri. This version is one of legend Full-Wave Rectifier.
Some of them are marked as Mullard, Amperex, Dynaco... but all are the same. 
Nos in original box. Matched pair are available.

Made in G.Britain by Mullard.
The first 5AR4 / GZ34 from Mullard - Blackburn. Fat Brown Base and Double O-Getter.
It is F31 Seri. This version is one of legend Full-Wave Rectifier. 
The brown base are special made for English Military so they are marked CV1377. 
Nos in original box. Matched pair are available.

This is the third version with Double O-Getter. Better than single O-Getter version.
They maybe marked as Mullard, Philips, Amperex, Telefunken, Siemens, IEC, RCA, GE... but all of them made in Blackburn of G.Britain by Mullard (late 1960s).

Nos in original box. Matched pair are available.