Old Muntz TV for sale Locally to me, Should I pick it up?

[jr_tech]

Originally Posted by Electronic M

By the late 40s some pF range capacitors were made on tubular ceramic forms and color coded....they look just like dogbone resistors but really are dogbone capacitors....If it's presence bothers you check the schematic for capacitors connected in the way it is.

Likely the 3 uuf cap shown between pin 3 and ground....I suspect that pin 6 was used as a tie point.

jr

[vortalexfan]

Originally Posted by jr_tech

Likely the 3 uuf cap shown between pin 3 and ground....I suspect that pin 6 was used as a tie point.

jr

Yep that's what it was, and it measures within tolerance so I'm leaving it alone.

But all the resistors around it are all out of tolerance or measure open, so they're all getting replaced.

[jr_tech]

Originally Posted by vortalexfan

But all the resistors around it are all out of tolerance or measure open, so they're all getting replaced.

Do you check all of the new resistors before you do the replacement... Once in a while a new resistor will be bad or mis-labeled. It is also interesting to recheck the old resistors after removal, to verify your diagnosis.

jr

[vortalexfan]

Originally Posted by jr_tech

Do you check all of the new resistors before you do the replacement... Once in a while a new resistor will be bad or mis-labeled. It is also interesting to recheck the old resistors after removal, to verify your diagnosis.

jr

Yes to both, my new resistors tested within spec (they are 5% tolerance resistors) and the old resistors tested way out of spec and or open, and that is the case with almost all of the resistors in this TV it seems and I'm going to have to order some resistors as well because there were some resistor values in the set that I didn't have in my resistor stash like 180k Ohm, 2.2M Ohm, etc.

Most of the resistors in the set I have already fortunately, just a few oddball values that I don't have in my stash I'm gonna have to order.

[vortalexfan]

Here's a couple of the capacitors that were inside the TV some Cornell-Dubilier "Tiny Chief" Capacitors!

[vortalexfan]

Well I think as far as trying to get this thing going completely goes, I'm just going to replace all of the open and out of tolerance resistors in each circuit one circuit at a time and test the TV out after each section is done to see what the TV is doing after each section is done, that way if I get the TV to give a raster and what not midway through then I'll know by what sections I just completed replacing the resistors in that those sections were what was responsible for the TV's issues and I'll know that more than likely the rest of the resistors that I hadn't touched yet by that point will more than likely be fine to leave in place (unless they are 5% or 10% tolerance resistors which then in that case I would just replace those because of the fact that those tighter tolerance resistors are a little more important to the circuit's functionality than the 20% tolerance resistor are).

[vortalexfan]

I just put in a large order of Resistors to Mouser of all of the Resistors that I needed that to replace in the TV that I didn't already have in my stash, and it only cost me $22 and some change including 2 day shipping through FedEx. I really stocked up and got 20 of each one of the resistors I needed that I didn't already have in my stash, and that way most of the resistors worked out to be less than 10 cents a piece with some being less than 5 cents a piece.