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692
RICHARDSON'S DLUEBOOK OF PROJECTION
THE TROUBLE TESTS
Check socket voltages of high reading tube, beginning with control grid voltage, using high resistance meter, and examine faulty circuit for cause of improper voltage
10.
Replace tubes
all high reading
II. Apply Test No. 9, above, to high reading tubes, beginning with control grid voltages, and look for trouble cause in those portions of the faulty supply circuit common to all tubes affected
12. Proceed per Chart No. 7 or No. 13.
13. Take all available readings
14. Replace all tubes
THE CONDITION FOUND
TROUBLE FOUND
TROUBLE CURED Distortion and high reading
NEXT TEST
TROUBLE FOUND
All readings normal One or more readings ab normal
TROUBLE CURED Distortion remains
J 5. Check all socket voltages, All voltages normal
using high resistance meter Some voltages abnormal
16. Replace tubes showing abnormal readings
TROUBLE CURED Distortion and abnormal reading remain
17. Check socket voltages of TROUBLE FOUND tubes reading abnormally. and investigate faulty supply circuits common to the tubes affected
18. Look for trouble cause in those portions of the faulty supply line which is common only to the tubes affected
19. Replace all tubes
20. Check setting and tightness of connections of all adjustable by-pass condensers or other devices in the amplifier for modifying sound quality
TROUBLE FOUND
TROUBLE CURED Distortion remains
Settinq wrong Connection faulty All settings and connections okay
No. II
No. 14 No. 16
No. 15
No. 20 No. 18
No. 17
No.
20
No.
21
No. No.
22
23