1960 Curtis Mathes Television 1121, 2121, 3121A, 5521A

I purchased this set around Christmas of 2018 for $2.50. As you can see below the socket was broken off of the picture tube. The set was also dirty.

Below you can see before and after of the RF section of the TV. Notice all the black capacitors in the first photo.

Below is the power supply section.

Here is the tv back working again.

Comments

Seeburg Digital Control Center

The Seeburg Digital Control Center came into use around the 1970's. This was model DDC1. Seeburg continued the use to the digital control center line until around 1977. The last model used was a DCC42-56. The DCC is used to supply 27 volts DC, -27 volts DC and -13 volts DC to the jukebox. The DCC has test points on the side to measure these voltages. Below you can see a DCC3. Once you flip over the DCC you will see two circuit boards. The top board is the data buffer board. Generally you will not have any issue with it. The second board (on bottom) is the power supply board. This where you may have issues. The power supply board is where the DC voltages are created and regulated. Below is the power supply board removed. The first thing I always do when working on a DCC is start by replacing all electrolytic capacitors. Below is the schematic. In my case as you can see below I had other issues. As you can see transistor Q3120 has ...

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.

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.

Cody's Microcosm

Search This Blog