Hi Ron,
Thanks for the suggestions. The amp is a MRA3-L6, receiver is a WSR5-L6, original Seeburg red head cartridge. Sorry I left this information off the original post. I'll work through your suggestions and hopefully identify the issue. Thanks gain. Steve.

I am occasionally getting a high pitched "whistle" sound from my speaker between the time when a record finishes and is being returned to the magazine, and when the next selection just starts to play. I believe this is suppose to be the interval when the "mute" circuit is activat...

I have a black and silver Seeburg stereo cartridge with a the number 253781 printed on it. It has original yellow styli and is attached to a mono adapter. I have a few questions: 1)Are the styli 0.7 mil diamond 2) Can this cartridge/styli be used in a Seeburg M100C 3) Will this cartridge/styli perfo...

Hi Ron, Bingo, loose fuse holder. I did follow the arrows through the troubleshooting graphic, and went through the troubleshooting line items before posting, but didn't suspect the fuse holder. It seems to have been the culprit. Makes the most sense now since the issue only happened after the back ...

The Select light does light up after coins are deposited, selector buttons function correctly, select light does go out after selection is made, carriage scans but none of the selection levers on the pin bank pull in (select coils do not energize). The jukebox has been working correctly for all 100 ...

Thanks Ron. I also have two original redheads for my "C". One measures 1.86k and one measures 1.70k ohms. Any significance between these measurements? Steve.

I have the following two pairs of new needles that came with my M100C and would like to know if either is suitable to use in an original redhead for playing both mono and stereo records. I have read many postings about compatibility of various cartridge/needle combinations for playing both mono and ...

Hi Ron, Everything seems to be working now except for the scanning issue. Before I remove the SAU and shake it (or disassemble it) is there a way to localize where the short to ground may be by checking continuity from ground to each individual non-selected pins? Or by checking the SAU's large black...

Hi Ron, Just before I logged in just now, I went through the manual again and I did focus on the Clamp Arm switches since that could cause an immediate record reject. It turns out that the switches were slightly out of adjustment, and depending on the THICKNESS of the individual record, either it wo...

Ron, I pulled all the pins out then pushed them back in. They are all in alignment. With all the pins in the non-selected state the mech repeatedly scans back and forth and does not stop. I then made some random selections from the ES and had the same problem of selecting records then immediately re...

Hi Ron, Problem 1) I checked the Play Relay and it does energize when power is applied, and relax when it is denied. The contacts are not welded and do open when relaxed. Disconnecting the single wire from the SAU and ES causes the Play Relay to relax and stops the motor from scanning. What do you m...

I'm having the following issues with my Seeburg C. I have the manual but cannot trace the problems. Here are the symptoms: -when the power switch is turned on the motor immediately starts and repeatedly scans back and forth. There are no credits, and no selections have been made. -if credits are est...

Yes, DC voltages in the amp. So at least the 5U4 tube needs to be in, correct?

Also, the schematic indicates that the 5 volt AC voltage for the 5U4 is measured "across winding not to ground". Is this measured at pins 2 and 8 on the 5U4?

Do all the tubes need to be installed in order to check the amp voltages listed on the schematic?

I've searched many of the local suppliers and found several types of wire wound resistors having the same specifications for the R1 resistor (1200 ohms, 10 watts, 5% tolerance) but having very different construction methods. These included various types of winding methods, type of wire alloy, operat...