Cadillac radio 7264165 is covered in Sam's Photofact #302-2 and their auto radio book AR#5. I usually suggest a local library or calling Sam's. Since you live in Brazil might try their web site:
http://www.samswebsite.com/
Norm
:Hello friend, congratulations for Forun.
:
:I am in Brazil and I face problems with the Radio of a Cadillac 1954, I model 7264165. This radio was recuperated previously by me and its operation was great. His Problem now is the unit of syntony that not for when detecting a station, as it should be. Can anybody help me?
:Thank you.
:
:Indalécio
Radio plays okay, but tuner does not stop on stations?
1. Replace 12AU7 tube with known good tube.
2. Check 2nd. I.F. transformer for defective mica capacitors in bottom of transformer (strong possibility). Delco No. 1220204. Miller K-Tran 15H-6 is a good replacement.
3. Check all resistors and capacitors associated with 12AU7 tube.
R76 (looking at Delco Bulletin 6D1070) is a 12000 ohm 2 watt resistor, used only for starting the search function when one end is grounded through either selector bar or foot switch. R76 should have about 246 B+ volts DC on the other end, sourced through the coil of relay 87 (relay coil also supplies B+ for pin 6 of 12AU7).
Cadillac radio model 7264165 uses tuner series E2. Service Instructions for Signal Seeking Tuner Series E2 are contained in Delco Bulletin 6D621. This 23 page bulletin covers electrical and mechanical operation of the tuner, adjustments and a trouble-shooting guide. I can send you a photo-copy by U.S. Postal Service (Air Mail Letter Post).
Best Regards,
Meade Grazier
Lakewood, California
USA
Hello,
Your English is 100% better than my Portuguese!
If tuner operates normally when R76 is turned off (disconnected), this is your problem.
R76 should not be tied up (grounded) in normal operation. Look for a short to ground in the wiring for foot switch or selectronic push bar. Make sure that switches 91 and 92 are not grounded unless actuated. Disconnect plug 102 to isolate the foot switch.
I.F. transformer is probably okay if tuner operates normally with R76 turned off. The capacitors in the transformer are the silver coated mica sheets in the plastic base. Values have to be determined by substitution. For capacitors paralleling the coils, try 80 to 120 mmfd. silver micas. Other capacitors are smaller: maybe 47mmfd?
I do not have a scanner, so I am unable to email the tuner service outline, I can photo-copy it and send by airmail letter post. I will email you for your mailing address.
Meade
Hello Indalecio,
I sent you an email, but it came back as undeliverable.
The capacitors in the IF transformers can be substituted with silver micas outside of the packing. Disconnect or remove the sheets from within the packing. I have used capacitor values between 80 to 120pf for substitution. Value depends on the particular transformer, use whatever will permit peaking of the 262kc signal close to the center of adjustment range.
Substitute IF transformers are hard to find here also. I sometimes buy a similar junk radio to obtain certain parts.
Tensions (voltages) on P3 and P8 (12AU7 cathodes) are too high--should be about half of B+ voltage when tuner is stopped on a station, and about 10 volts when scanning. Check resistors number 68 (47000 ohms), 70 (6800 ohms), 74 (1000 ohms), and 75 (47000 ohms).
Meade