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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
976 12CX6 12 A 40
977 12CY6 12 A 40
978 12D4 12 D 35
979 12DB5 12 D 65 Z
980 12DE8 12 A 50
981 12DE8 12 G 100
982 12DF5 12 A 65
983 12DF5 12 D 65
984 12DF7 12 B 45
985 12DF7 12 C 45
986 12DK5 12 B 40
987 12DK7 12 A 60
988 12DK7 12 D 100
989 12DK7 12 E 100
990 12DL8 12 G 55
991 12DL8 12 A 100
992 12DL8 12 E 100
993 12DM5 12 B 40 Z
994 12DM7 12 B 50 X
995 12DM7 12 C 50 X
996 12DQ6 12 D 45 X
997 12DQ7 12 B 40 Y
998 12DS7 12 G 45
999 12DS7 12 A 100
1000 12DS7 12 E 100
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