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

[vortalexfan]

Originally Posted by Tom9589

The one twist lock tab with wires on it is the common (negative) terminal of all three 40 mfd capacitors in the can. The design of this power supply calls for the this cap to be connected to a point other than ground. It might be a way for the power supply to generate a negative bias power supply. If you could get a schematic, it would be obvious.

I do have a schematic but it's hard to make heads or tails of it as far as finding the Power Supply or what not.

[Electronic M]

Originally Posted by vortalexfan

I do have a schematic but it's hard to make heads or tails of it as far as finding the Power Supply or what not.

If there is a power transformer, look for it. If there is a power rectifier look for it. Even the wackiest non- standard schematics and circuit designs can be followed if you find the recognizable stuff and trace from it to what you need. If parts values are only listed in a separate table print the table and have it next to the schematic. If the schematic is on multiple pages print it out and stick the sections together into a single page.

[jr_tech]

Photofact set 110, folder 9 covers 14 Meck models from 1950...I suspect that the power supply in question is very similar to the one shown in that folder:



The common (connections to the can) of C1 (40,40,40) is floated from chassis ground so that a minus 3 volt supply can be created to provid bias to the video detector stage.

jr

[vortalexfan]

Originally Posted by jr_tech

Photofact set 110, folder 9 covers 14 Meck models from 1950...I suspect that the power supply in question is very similar to the one shown in that folder:



The common (connections to the can) of C1 (40,40,40) is floated from chassis ground so that a minus 3 volt supply can be created to provid bias to the video detector stage.

jr

Yes I found the power supply stage after looking over the schematic from Beitman's that I have (unfortunately I do not have access to the Sam's folder for this TV, I have every Sam's Folder from this time period except 110, and I don't wish to pay the $30 that Sam's is asking at their website for this Photofact folder copy.)

It does seem that it does have a floating ground which I'm not sure how it would work to do that with a terminal strip and 3 47 MFD 450 VDC electrolytic caps when the only terminal strips I have have the mounting tabs that mount it to the chassis also doubling as chassis ground terminals, which I don't need in this case.

[Notimetolooz]

Originally Posted by vortalexfan

It does seem that it does have a floating ground which I'm not sure how it would work to do that with a terminal strip and 3 47 MFD 450 VDC electrolytic caps when the only terminal strips I have have the mounting tabs that mount it to the chassis also doubling as chassis ground terminals, which I don't need in this case.

Don't let the lack of a proper terminal strip prevent you from doing the job right.
http://www.radiodaze.com/terminal-strips/

[vortalexfan]

Originally Posted by Notimetolooz

Don't let the lack of a proper terminal strip prevent you from doing the job right.
http://www.radiodaze.com/terminal-strips/

Thanks for the link, I think I found a terminal strip there that will work for what I need.