The Estey T-12: Radio Tubes?

15 09 2009

1967 Estey T-12 Tube Amp Photo 9

For once, one of my amps has the schematic still attached! It’s a bit hard to see here but it’s all drawn up very nicely and also indicates that the amp design was approved for manufacture in December, 1964.

1967 Estey T-12 Tube Amp Photo 7

The tubes aren’t the average choices for most amps and that’s something I like; it sounds great while not featuring the same old 12ax7 and el84 lineup.

1967 Estey T-12 Tube Amp Photo 8

The preamp duties are performed by a 20ez7 with a 45b5 handling the output tube chores and a 36am3a serving as the rectifier.

Not sure if this is really the case, but I’ve read that a 20ez7 is a 12ax7 with a 20 volt heater. It’s definitely an uncommo valve and shows up in few tube radio applications in the early/mid 1960’s.

The 45b5 is known as a ul84 in Europe and was used in some mid 1950’s tube radio designs.

The 36am3a is a 7 pin vale developed in 1940 that was popular in the early and mid- 60’s for tube radio sets.


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