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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
726 7A7 6 D 70
727 7A8 6 G 60
728 7AD7 6 D 40
729 7AF7 6 F 65
730 7AF7 6 G 65
731 7AG7 6 D 35
732 7AH7 6 D 40
733 7AJ7 6 D 50
734 7AK7 6 D 40
735 7AN7 * 7 B 55
736 7AN7 * 7 D 55
737 7AU7 7 B 50 X
738 7AU7 7 C 50 X
739 7B4 6 D 60
740 7B5 6 D 75
741 7B6 6 A 60 X
742 7B6 6 D 100 X
743 7B6 6 F 100 X
744 7B7 6 D 70
745 7B8 6 G 60
746 7C4 6 G 80
747 7C5 6 D 55
748 7C6 6 A 75 X
749 7C6 6 D 100 X
750 7C6 6 F 100 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