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EICO MODEL 635 TUBE TESTER MANUAL
The accompanying GIF files represent the entire operating manual and tube listings for
EICO Model #635 tube tester. Manufactured by the EICO Electronic Instrument
Company.
The manual is dated 1968.
This tester was purchased as a kit Feb. 22, 1972 and to-date has never required any
repairs. While possibly not the most accurate of tube testers it is certainly one of the
easiest and quickest to use. The 635 generally gives a good indication of tube "go no go"
condition, however on occasion, I have had to turn to my Heathkit IT-21 to find internal
leakage and shorts that did not show up on the Eico 635.
In the past 30 plus years I've tested literally thousands of tubes with it.
Gord