6300 ohm resistor

[pearsonk]

Anyone have a 630ts, or clone of, parts chassis? I need the large 4", 6300 ohm
resistor found in the HV cage.
PM me.
thanks
pearsonk

[Yamamaya42]

Unless someone has one used to offer, the part is pretty much unobtainium.
You may try to make one via 3 power resistors 50w 5.3k +500 + 500, but the 5.3k in large sizes seem to be hard to find, closest I have found so far, is 5.6k, this may be close enough in this case.

HSA505K6J
THS50500RJ

[bandersen]

Better yet use an adjustable one like this: https://www.mouser.com/ProductDetail...x9RYYOLg%3D%3D

[pearsonk]

Thanks for the tips. Hoping someone has a parts chassis I could get
one from. They were used in many sets mfg in late '40s......

[bandersen]

Yes, they were, and are a high failure rate part. I think I've had to replace that resistor in every 40s Admiral chassis I've worked on.

[Yamamaya42]

Originally Posted by bandersen

Yes, they were, and are a high failure rate part. I think I've had to replace that resistor in every 40s Admiral chassis I've worked on.

what has me confused is, when I look at the RCA 630ts specs for the part, it says 20w, but when I look it up for my FADA it says 50w, did they just improve on the weakness of the 20w part?
and that's perhaps why my resistors have held up?

[pearsonk]

Yep, I have noticed several brands used 50w, others 20w....
A workaround is always possible...

[mrjukebox160]

https://www.elliottelectronicsupply....-rw35v632.html

[bandersen]

Nice find. The original does have a couple taps though. I believe for adjusting width or linearity.

[Yamamaya42]

Originally Posted by mrjukebox160

https://www.elliottelectronicsupply....-rw35v632.html

this one is incorrect

because it needs to have taps at 5.3k &500 &500 but the over all resistance is 6300.

http://suzaku.live-evil.org/lin-adj.jpg

[Yamamaya42]

Originally Posted by bandersen

Nice find. The original does have a couple taps though. I believe for adjusting width or linearity.

u beat me too it!

[pearsonk]

Thanks to MRjukebox160.
Perfect replacement as I need the full 6300..............
Mallory #RW35v632

[Yamamaya42]

IMHO, it would be unwise to use a fixed value for that resistor, as you would lose the ability to adjust horizontal linearity, for example, my FADA 895 has it tied to one of the center taps.

[mrjukebox160]

I didn't realise it had taps.

[bandersen]

Here's a bad original. I believe it's that green corrosion that kills them.