Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

GE H-632U Ballast Resistor Hytron K42B
#1

Not sure where this should GO.. So if in wrong place please move...


Ballast resistor. Hytron K42B.. I am sure this has been asked already But cannot find a schematic or Pinout of that tube.. With Resistance Values..

This is in a GE H632U Radio that I am starting to work on.. schematic for radio shows 2 resistors in series with the pilot lamp across one of them..

I tried to measure the tube and from pin 3 to 7 I get approx 3.0 Meg and from Pin 7 to 8 I get approx 770K.. No readings on any other pins..

Is this correct??

Skip..
#2

Hi Skip,
> But cannot find a schematic 
It's R-14 and it's kaput. As you can see it lowers the 120vac to power the heater string and dial lamp. So there are a couple ways to replace it.
1. Try to find a repl;acement tube.
2. Use a non polarized cap ( generally about 6-8mfd @ 200v).
3 Use a resistor to equal R-14.


So R-14= 133 ohms @ 25w  & a 40 ohm resistor in parallel with the lamp so it will equal 300ma. R-14 will get very hot and is pretty big too.
Or this:


Attached Files Image(s)
   

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#3

If it were me, I would probably go with the capacitive dropper, higher value non polarized capacitors are smaller, cheaper, and easier to find then they used to be. However you will still need a resistor to parallel with the pilot lamp.
Regards
Arran
#4

Arran, Ok What would that circuit look like?

Skip...
#5

Same as mine but remove the diode and 33 ohm resistor. In it's place add a 8.5 uf non polarized cap at 250wv.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#6

Terry, OK thanks.. in your opinion what would be the best one to use.

Skip...
#7

Doesn't matter much. Both do the same thing. My thinking is that you may have the two resistors and can wire it up pretty quickly. The capaciitive dropper you got to order and wait for the part to come in. Resistive dropper will generate a little heat (a lot less than a flaming hot BL42 tube) vs the cap won't. The 33ohm resistor you can play w/the value a bit something like 25-40 ohms will work. Either one you can wire up into an old octal socket to make in plug in like the original.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#8

Well I broke down and order some Caps and found a new ballast resistor.. So ordered that also..

Arrived today.. Measured pin 3-7 got 134 Ohms.. Then measured 7-8 and got 23 ohms.. So that looks reasonable.. What do you guys think?


Skip...
#9

What's there to think....? It's a ballast tube.

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 91 Speaker Replacement
I can't remember, but there was a particular product for loosening glue on the more modern "spiders", used pos...MrFixr55 — 09:43 PM
Philco 91 Speaker Replacement
The spider is glued on the cone and so is the voice coil. I think you can use a cotton swab dipped in acetone and carefu...RodB — 02:42 PM
Restoring Philco 37-604C
Yes I saw that. If I knew, I'd probably try to arrange for getting it myself. But I have just got one. Which does not m...morzh — 01:44 PM
Philco 38-2 Automatic Tuning
When you push the lever, you are supposed to rotate the disk to the desired station. Then the magnetic tuning will acqu...morzh — 01:42 PM
Philco 38-2 Automatic Tuning
I figure out the muting from another picture that helped. Now I need to know how the automatic tuning works. When I push...dconant — 12:11 PM
Philco 91 Speaker Replacement
How would I go about removing the spider from the cone?dconant — 12:04 PM
Philco 38-2 Automatic Tuning
Hello, I am having trouble getting my automatic tuning to stay unmuted. If I play with the tuning handle I can get it to...dconant — 10:51 AM
Does anyone make photofinish replacements?
Here’s the link to the DIY photofinish section of our site: klondike98 — 09:46 AM
Delco car radio Peko vibrator converstion issues
Hi Richard, Thx for posting the schematic.  As I remember as a kid, these were great performers for the time, likely...MrFixr55 — 08:56 AM
Delco car radio Peko vibrator converstion issues
hello mr Fixr, The Electro  Powersupply that I am powering the radio with has a huge choke plus a 10,000ufd electrolyti...radiorich — 10:58 PM

[-]
Who's Online
There are currently no members online.

>