Skip to main content

Seeburg MRA1-L6

Seeburg MRA1-L6
A friend of mine sent this Seeburg MRA1-L6 to me to be gone through. At first glance I thought it should be a typical recap job, but it was quickly discovered this things has some big issues . I will discuss those a later. 

This amplifier came out of a Seeburg M100A.  This jukebox plays 100 sections. There is a total of 50 discs and this player will play either side. My friend is currently working on mechanics of jukebox while I am working on the amplifier.The photos below show the amplifier as I received it.

The issues with this amplifier besides the old capacitors from about 1948 is the output transformer and possibly the power transformer. The output transformer is near the center of the first photo at the top. I believe it has been chewed on by possibly mice. The inner wrapping is showing and the wires are loose. The power transformer checks out fine with an ohm meter, but the wires to the primary and the center tap of the high voltage has been cut. This made me wonder why they were cut.

The solutions to the problems would have been more expensive than finding a complete amplifier. So that is what we did, we found a complete amplifier. I am hoping it arrives early next week. I will then post about it and the work to be done on it. 
  
The amplifier as I received it.
The underside.
Up close of the old caps.
Up close of the power plug and the splicing of the output transformer. If you look close in the bottom center you can see the cut wires.
Labels:

Comments

Post a Comment

Popular posts from this blog

Bell & Howell Oscilloscope Model 34 DeVry Tech

The Bell & Howell Oscilloscope Model 34 was purchased at an auction and then give to me. It was made by Heathkit for DeVry Tech (DeVry University). Below is a photo of the front after I finished electronically going through it. There was nothing interesting that came up while working on it. Below you can see some before and after of the underside. Below is the top side. The 2 filter cans were 4 sections of 20mfd for a total of eight 20mfd capacitors.  Below is the solution I came up with to replace them. It consists of eight 22 mfd on a PCB that is zipped tied to the bottom of the chassis.   Overall this is a simple oscilloscope and was a simple electronic restore.  Here is the schematic.
3 comments
Read more

O.M.G.S Japanese AA5 Radio

O.M.G.S Japanese AA5 Radio It does work. The electrical work was done prior to me purchasing the radio.
Post a Comment
Read more

Robyn T-123B

I picked up this radio at a local flea market. It was in fair shape and dirty. The radio smells like cigarette smoke as it heats up. Below you can see what the top side looks like. I changed all electrolytic and fil m capacitors. Below is the underside before I change capaitors. Here is a photo after:  The only issue this radio had was an open 33k ohm resistor coming off the meter adjust pot. The symptoms were the meter seeing a constant 7 volts across it and a lower screen voltage on the first IF amplifier. Once the resistor was replaced the voltage went away and the screen grid voltage went back to normal.  Cleaned up face.
2 comments
Read more