Admiral 30A12 restoration

[bandersen]

I've spent far more time on this set than I ever expected trying to track down the excessive width issue.
Finally, as I was about to abandon all hope, I noticed the huge power resistor in the HV cage was cold! An ohmmter confirmed that it was open.


Now where to find a replacement ? Luckily, I have an entire space 30A1 parts chassis but it too was bad.


So, I pulled one from another of my Admiral sets,. Ugh! All three are bad I'm guessing this was either a common point of failure back in the bad or they go bad just sitting idle over the years.

I have a coupe more sets to scavenge from otherwise I'll cobble something together.
Regardless, I'm going to have to find a source of replacement 5,300-6,300 ohm 50W resistors if I want to get all my sets working properly.
Note the taps are 500 ohms apart and used to correct horizontal linearity if needed. All my sets use the center tap so that would be 5,800 ohms.

[Geist]

Hi All;
Bob, It looks like it is the same as what is used by RCA in the 630, and 830 type of sets.. Possibly more, or other RCA early TV's.. The Flyback also looks like it could be the same..
THANK YOU Marty

[bandersen]

I pulled one from every Admiral set and chassis I have and they are all bad

Originally Posted by Geist

Hi All;
Bob, It looks like it is the same as what is used by RCA in the 630, and 830 type of sets.. Possibly more, or other RCA early TV's.. The Flyback also looks like it could be the same..
THANK YOU Marty

Yes, it both looks the same and is the same value. So I suppose I could borrow a good one from my 630TS.

This was Admiral's first TV on the market so I bet they were cautious and cloned RCA's HV design.

[wa2ise]

If the open is between the 2nd and 3rd terminal (counting from the bottom) and if the ohms between the 2nd and 3rd, and the 3rd and 4th terminal are supposed to be 500 ohms, connect terminals 2 and 3 together (to bridge the open) and connect the wire that was on the 3rd terminal to the 4th (top) terminal.

[brianweber4]

Originally Posted by bandersen

I've spent far more time on this set than I ever expected trying to track down the excessive width issue.
Finally, as I was about to abandon all hope, I noticed the huge power resistor in the HV cage was cold! An ohmmter confirmed that it was open.


Now where to find a replacement ? Luckily, I have an entire space 30A1 parts chassis but it too was bad.


So, I pulled one from another of my Admiral sets,. Ugh! All three are bad I'm guessing this was either a common point of failure back in the bad or they go bad just sitting idle over the years.

I have a coupe more sets to scavenge from otherwise I'll cobble something together.
Regardless, I'm going to have to find a source of replacement 5,300-6,300 ohm 50W resistors if I want to get all my sets working properly.
Note the taps are 500 ohms apart and used to correct horizontal linearity if needed. All my sets use the center tap so that would be 5,800 ohms.

That's a hard working part! in my Dumont Doghouse the 6K 35 watt dampening resistor was open and the ceramic was cracking and falling off of it. I got an exact replacement from Surplus Sales.