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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
226 6AJ8 6 E 60
227 6AK5 6 A 40 X
228 6AK6 6 A 75
229 6AK7 6 C 50 X
230 6AK8 6 F 65
231 6AK8 6 B 45
232 6AK8 6 A 45
233 6AK8 6 D 45
234 6AL5 6 B 45
235 6AL5 6 C 45
236 6AL6 6 D 40 X
237 6AM5 6 A 65
238 6AM6 6 A 50
239 6AM8 6 B 35
240 6AM8 6 F 45
241 6AN4 * 6 B 35 Y
242 6AN5 6 A 55 X
243 6AN7 6 B 50
244 6AN7 6 E 50
245 6AN8 6 B 40
246 6AN8 6 F 40
247 6AQ4 * 6 A 55 Y
248 6AQ5 6 A 60 X
249 6AQ6 6 A 70
250 6AQ6 6 D 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