Cape Old Radio
: Home : : cor_seco78.php?currentpage=26 :
Search Radio by Make, Model, Year, and/or Country.
Click to Expand/Collapse OptionHome
Click to Expand/Collapse OptionNew on Site
Click to Expand/Collapse OptionImage Index
Click to Expand/Collapse OptionContact
Click to Expand/Collapse OptionBeitman's & Rider's
Click to Expand/Collapse OptionUseful Links
Click to Expand/Collapse OptionTechnical Info
Click to Expand/Collapse OptionTube/Valve
Click to Expand/Collapse OptionRadio Collection

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
626 6R7 6 D 100 X
627 6R8 6 F 85
628 6R8 6 B 85
629 6R8 6 A 100
630 6R8 6 D 100
631 6S2 6 H 100 X Special Socket
632 6S4 6 G 50 Y
633 6S5 6 C 75 X
634 6S6 6 H 50 X
635 6S7 6 H 70 X
636 6S8 6 H 65
637 6S8 6 G 65
638 6S8 6 C 100
639 6S8 6 A 100
640 6SA7 6 D 60 X
641 6SB7 6 D 40 X
642 6SC7 6 C 90
643 6SC7 6 G 90
644 6SD7 6 C 60 X
645 6SE7 6 C 55 X
646 6SF5 6 G 65
647 6SF7 6 B 80
648 6SF7 6 D 100
649 6SG7 6 C 40 Y
650 6SH7 6 C 50 Y
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.


<< First  . . .    < Prev      21 22 23 24 25 [26] 27 28 29 30      Next >    . . .  Last >>



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