Seeburg fusing

I've seen both Rob and Ron post recommendations for improving the circuitry of the Seeburgs, especially insofar as protection is concerned, but I'm afraid I may have missed some, and I don't want to misapply advice given for a similar unit. I have a 100R with standard components: MRA5-L6 and WSR7-L6.

On the "100 selection, SAU type" Phono's, I add a 1/4 Amp SB fuse in series with the cancel coil pop meter solenoids.
I also always add electronic control to the latch bar solenoid ( a freeplay/coin, unit), or a minimum 1 amp fuse, in series with the AC hot supply at the latch-bar solenoid. On phono's using a WSR-3 or 5, I change the 2 amp sloblo to a MAX 1.6 amp--usually a 1.5 amp slow blow. Ron Rich

Hi Ron,

I have a Seeburg C with a MRA1-L6 amp (I think from a model B) with a WSR5-L6 Selection Receiver.

What extra fuse protection do you recommend?

Regards

Gordon..

Hi Gordon,
Just what I wrote above--however I usually lower the main fuse on a C, to a 4A., rather then the 5A., that's called for.
Ron Rich

NYJB wrote:I've seen both Rob and Ron post recommendations for improving the circuitry of the Seeburgs, especially insofar as protection is concerned, but I'm afraid I may have missed some, and I don't want to misapply advice given for a similar unit. I have a 100R with standard components: MRA5-L6 and WSR7-L6.

I made some remarks on fusing at several points during this topic:
viewtopic.php?t=8001 probably elsewhere too.

Rob

I'm a little confused about the popularity meter and cancel coil that Ron referred to. The popularity meter i understand. Is the cancel coil on the contact block? Where, physically, do you install them?

Correct me if I'm wrong, but for the voltage ratings, I just need to make sure that the voltage rating exceeds the voltage of the circuit.

Lastly, I have seen Ron recommend to a few people that they use fuses of 1.6A maximum in the seeburg receivers that were originally rated at 2A. Does the same apply for those that followed? That is, if my receiver was issued with a 1A fuse, should I keep it at 1, or go to 1.5?

Pop meter and cancel coil share the same "common" at the C-SC contacts. See schematic. I add the fuse at that point.
That's a 1/4 amp SB, so I don't think they are voltage rated--but I believe you are correct in stating that as long as it's rated higher, it is OK--?
No---use a 1 amp in the WSR-7 CCU fuse --best if you can get the WSR 5 to do so also--but that is sometimes difficult on them-- Ron Rich

Terry, FWIW: I prefer to fuse the outputs from the main transformer. On sources such as the 25VAC it powers a number of loads and it isn't practical or necessary to fuse each load. The 25 volt winding is robust and can easily blow a 5 amp fuse on it's load side if a fault occurs. For the older machines a 3-4 amp/slo should be fine.

Rob

Rob,
Not too worried about the transformer here--I just HATE changing selection coils in the SA unit, and it's not a lot of fun changing cancel coils in the "frog" either ! Ron Rich

I see your point, Ron.
Seeburg should have used a method of current limiting similar to what Rock ola and Wurlitzer used via a bulb, or simply made the system DC and used a discharging capacitor.

Rob

Hi Rob,
Yes--Having a DC cap fired system would have saved me many a nasty job, of changing SA Unit coils---
Never have been able to find an "easy way" to do that ! Ron Rich

Thank you, Gentlemen.

Separate question: I have a latch bar solenoid that seems to work, but the cloth wrapping has rotted away. With what should I replace it?

IF, you are using an electronic "FPA", I would not worry about it. If not, purchase/use one, or, at least add a 1-3 amp FB fuse to the "hot" side of the solenoid. I have seen many without the covering--seems to not be of concern. Ron Rich