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.
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.
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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