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SECO 78 Tube Tester




Select or type a tube name to get specific settings for the Eico 635 Tube Tester.

Sort columns values by clicking their titles - A → Z or Z → A

ID Tube IC Fil. Volts R Load L Notes
576 6GH8 6 E 35
577 6H4 6 C 90 X
578 6H6 6 G 90 X
579 6H6 6 D 90 X
580 6H7 6 D 80 X
581 6H7 6 H 80 X
582 6H8 6 H 80 X
583 6H8 6 C 80 X
584 6H8 6 D 80 X
585 6J4 * 6 B 40 Merit Test Only-Reads to Left
586 6J5 6 D 60 X
587 6J6 6 D 40
588 6J6 6 G 40
589 6J7 6 H 80 X
590 6J8 6 H 50 X
591 6J8 6 D 100 X
592 6K5 6 H 70 X
593 6K6 6 D 70 X
594 6K7 6 H 90 X
595 6K8 6 D 40 X
596 6L5 6 D 65 X
597 6L6 6 D 40 X
598 6L7 6 H 70 X
599 6M5 6 B 45
600 6M6 6 D 45 X
OPERATING INSTRUCTIONS
BEFORE YOU TEST
1. Set the "Function Switch" to its mid-position.
2. Set the Switch "L" to position marked "NORMAL"
3. Push the slide switch to "ON" position.
4. Allow a half minute for the tester warm up.
5. The meter pointer should rise to renter scale to the mark labeled "Line Adjust". Adjust control on the panel marked "Line Adjust" with a small screwdriver, if necessary.
TESTING
6. CAUTION: DO NOT INSERT THE TUBE INTO ITS SOCKET UNTIL ALL CONTROLS ARE PROPERLY SET UP.
7. Locate the tube to be tested on the set-up card. Example: Tube Type = 6AU4 -> Fil. V. = 6 -> Sw. "R" = D -> Load = 50 -> Sw. "L" = Leave in "normal" unless indicated by X, Y, or Z
8. Set up the controls as indicated.
9. Insert the tube in its socket. There-are two nine-pin sockets. The one at the tipper left is only used when indicated in the tube set-up.
10. Place the cap clip on top of the tube if one is used.
11. As the tube warms up the meter pointer will gradually read into the "GOOD" area on the right side of the scale. REJECT THE TUBE IF IT READS IN THE RED "REPLACE" area.
12. Push the "Function Switch" forward to the position marked "GCT SHORTS AND LEAKAGE" and tap the tube gently. A good tube should read in the "GOOD" area at the left end of the meter scale. REJECT THE TUBE IF THE POINTER JUMPS INTO THE RED AREA OR STAYS IN THE RED AREA.
13. Tubes having two or more entries on the set-up require more than one test. Set controls as indicated and proceed to test again. NOTE: on many types having two entries it is only necessary to move the SELECTOR SWITCH "R".
14. If it is desired to check a tube for filament continuity ONLY then pull the "FUNCTION" switch to position marked "FILAMENT CONTINUITY". The meter should read in the "GOOD" on the right side of the meter scale if continuity exists.
15. If an asterisk (*) appears opposite the tube set-up, this means that an inter-connection exists in the tube which cannot be isolated with lever switch "L". Such interconnections will indicate the same as a short between these pins and cause the meter to read in the red. Consult the tube manual if necessary.


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Last modified: Jun 5, 2026 20:40
Cape Old Radio - Since Nov, 1996
1996 - 2026 © Carlos Eduardo Lazarini da Fonseca