1956 RCA-8-PT (Portable Television)

The TV was found at an auction around the end of December 2018. It is missing all the accessories and looks beat up. Below is a photo of with case removed.

Below is further disassembly of the chassis. This made it much easier to recap and check the components.

The recap was a standard procedure. I did remove the shield from the CRT and the yoke cover had disintegrated. You can see the back of yoke below.

Below is my solution. A Duke's Mayonnaise lid.

This worked very well for the cover. As for the centering rings I used cardboard shims and tape to hold the shim in place. As seen below. Is this the best solution? No, but it works. I have no plans to get rid of the TV in the future. I am not trying to unload a problem on someone else.

Here is the TV finished up and sitting on top of my Dumont TV.

Comments

6J1 Preamplifier

6J1 Preamplifier I purchased this 6J1 amplifier from eBay. The seller was located in China. Below is a my experinces building the preamp. I have not had a chance to give it a full test. I will update this post once I have had that chance. It took a little over an hour and a half to finish building the kit. The board seemed a little tight for installing everything. The board itself runs on 12AC and from what I can gather it takes the 12AC and runs it through a voltage doubler which then gives the "B+" voltage.The tubes are 6J1's and obviously have 6volt filaments that run in series. I can not find a lot of info on the 6J1. Link to Data Sheet . There is not a lot of instructions. Most everything is in chines and so I cannot read it. I was able to follow down the parts list and figure out what everything was and where everything went. I used a multimeter to check the resistors before installing them because the colors were not easy to interrupt. Overall this is

Philco P933-124 from 1966

I have been wanting an AM/FM tube radio. I found this one eBay fairly cheap and I love Philco products. The eBay listing said the radio worked as is. Below is how I received the radio. I was very pleased with the packing! The radio was all original from what I could tell and had a great sound. I went ahead and disassembled the radio and replaced the electrolytic capacitors. The radio has a great sound and very sensitive. Below is the schematic.

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 been repla

Cody's Microcosm

Search This Blog