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Post by mauro on Nov 27, 2017 15:09:57 GMT
So I have this spare R145 amp for my AMI model I jukebox and at some point someone must have converted it to a guitar amp as the whole mute relay and wiring has been removed. I'm sure there must be a replacement easily found in the aftermarket as I've seen Guardian relays used in Wurltzer amplifiers, so my question is, what specs should I be looking for?
Is it 24vdc?
Have some spare time coming up so thought I'd tackle this now.
Thanks Guys!
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Post by Ron Rich on Nov 27, 2017 15:57:28 GMT
Mauro,
Since you have two of these amps, look at the relay in the other one-- there is probably some sort of ID name/number on it--get that info, and contact any NTE dealer, and they should be able to cross ref. it to one they sell. Ron Rich
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Post by mauro on Nov 28, 2017 0:20:53 GMT
Ron,
You really are a storehouse of knowledge! I didn't even know that NTE made relays. I'm used to looking at them for transistors, IC's and diodes and such.
Glad you are here to share these tidbits!
I'm going to remove the amp and have a look at it but I remember not seeing any printing on it but I didn't look that close at the time, hopefully I can make out a number.
Thanks again!
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Post by mauro on Nov 28, 2017 1:21:32 GMT
So I had a look in the amp from the actual machine and as I feared there are no markings anywhere on the relay. The amp is actually very clean inside. There was just a painted yellow dot in the middle of the black winding covering and a reddish brown dot near the bottom of the winding.
The machine is in storage (garage) at the moment as I am doing work in my basement otherwise I would just plug it in and check the voltages.
Since the power for this relay comes from the junction box assembly I'm guessing it's 24-28 vdc.
Not sure if I can find a replacement with the same switch configuration though? May have to call around to see if any of the usual suspects have a parts amplifier. I think I'm going to check a local surplus store on the weekend.
Any alternatives?
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Post by Ron Rich on Nov 28, 2017 3:59:45 GMT
Hi Mauro,
Do you have a shop manual for the phono ? If so, Rowe sometimes gave the generic names/numbers for parts like that --
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Post by robnyc on Nov 28, 2017 12:49:14 GMT
Mauro, you can use nearly any LV-DC dual pole relay. A good choice is a cube type which will provide a degree of insulation due to teh high voltage in the B+ contacts. Whether you use a socket or solder directly to the relay terminals make sure to boot at least the B+ contacts for safety and anchor the relay case to the chassis.
FWIW: The structure of this circuit was idiotic. It switches the B+ each time a disk is played. This produces a lot of inrush current on both rectifier and filters.
RobNYC
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Post by mauro on Nov 28, 2017 22:49:45 GMT
I have 2 copies of the manual and niether show any description, except "relay".
I found a cube type 24 vdc relay in my junk drawer, it has 3 sets of no/nc contacts, so if I use one and a half of them I should be able to put the circuit back together by following the schematic and the other amplifier.
Thanks to all for the input!
btw- I agree with you Rob, that's a pretty idiotic way of doing it, if I knew how to mod it - I would.
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Post by Ron Rich on Nov 28, 2017 22:59:39 GMT
Mauro,
A parts book, in "Rowease" is NOT a Shop Manual. Rowe issued large size shop manuals for almost all of the later phono's up to the CD's. They are much more detailed then the service/parts manuals. If you tell me what model phono you are working on, I'll check to see if I have the Shop Manual, and look to see if it offers a manufacture's number. Ron Rich
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Post by robnyc on Nov 29, 2017 5:35:01 GMT
Mauro, in the F service diagram that relay is called H-337.
In the I manual it is H-1314
In both cases there are two (2) S-1210 -2 spacers.
Since the amps are both the same (R-145) i don't understand why there are two different numbers other than perhaps an additional pair for the machines equipped with AGC.
In any case, I would just use "whatever" 24VDc relay has adequate contacts in size and number.
RobNYC
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