Very good sounding replacement tube for the butt ugly straight 5U4G from the USA or modern likes from JJ's for example. Balanced testing at 390/390V! Comes in military packaging. 1967 production made in Russia by Svetlana.

For sale are offered CIFTÉ 5Y3GB. Cifté were a French manufacture of valves Compagnie Industrielle Francaise des Tubes Electroniques aka "CIFTÉ". The valves were of very high quality due to excellent quality control.

These are the Original Cifté French military 5Y3GB rectifiers that date from March 1963.These have the famous 1950's ST style shoulder shape bottle which is fatter than the small bottle 5Y3GT. These are identical to the Mazda 5Y3GB and built to the same military specification. The 5Y3GB is 4 inches tall by 1.75 inch wide a 5Y3GT is 2.5 inches tall by 1.5 inch wide by comparison. These 5Y3GB are one of our most popular rectifiers as not only do they have a striking visual appearance but offer superb performance and headroom. Customers tell us of improved performance over the GT types; this may be due to the larger glass envelope, larger anode plates and bigger internal vacuum. The anode has a black grey coating and has and internal strut support. This valve in both audio and guitar applications offer superb performance and headroom. The valve comes in the original Cifté military box.

Made in USA NOS JG-6X4 General Electric  1956 week 48. Low stock. Probably black plates made for Bendix.

NOS Russian tube rectifier 5U4C. Equivalents 5Z4GT. This vintage Russian 5U4C (5Ц4С in Cyrillic script) rectifier is a 5Z4 equivalent. This slow-rise, indirectly-heated rectifier should be considered an upgrade for a 5Y3 tube in most circuits, and will drop slightly less voltage. It has gray plates and a bottom dish getter. The silver print on the base has the OTK inspection stamp. Made XI-75.

NOS USA made Raytheon 6X5GT rectifier equivalent of European EZ35. Lovely small rectifier. 

NOS Russia XI-79 near equivalent of 5Z4, 5Z4G, CV1863 tube rectifier.

Russian NOS 72's Reflector 6Z4 equivalent of a 6X4 EZ90 but different pinout. Cost effective upgrade rewiring one wire from pin 6 to 7. Black plates. Chinese 6Z4 is direct replacement. 5000 hours longlife molybdeen pins cleaned with Deoxit. Comes in original factory boxes!

GE JAN 5726 6AL5W EAA91 double diode silver plates 80's NOS. Measuring 120%+ of NOS values. Excellent rectifier. Miniatur 7BG 7 pin base. Tested on the Amplitrex AT1000.