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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
351 6BK6 6 G 100
352 6BK7 6 B 35
353 6BK7 6 C 35
354 6BK8 6 E 45
355 6BL4 6 D 55
356 6BL7 6 A 45
357 6BL7 6 C 45
358 6BL8 6 B 50
359 6BL8 6 E 50
360 6BM5 6 A 45 X
361 6BM8 6 A 65
362 6BM8 6 G 55
363 6BN4 * 6 B 35 X
364 6BN5 6 E 40 Special Socket
365 6BN6 6 G 100
366 6BN7 6 B 50
367 6BN7 6 C 50
368 6BN8 6 F 40
369 6BN8 6 A 50
370 6BN8 6 D 50
371 6BQ5 6 E 30 Special Socket
372 6BQ6 6 D 45 X
373 6BQ7 6 B 40
374 6BQ7 6 C 40
375 6BR7 6 B 50
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