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

Philco 77 volume control
#16

I doubt if you'll find a 1750 ohm rheostat. I wouldn't be afraid to try 1800 or even 2000 ohms.

--
Ron Ramirez
Ferdinand IN
#17

2000 Ohms is fine - actually this is what's quoted in the Rider's for it.

Bigger wattage is always OK, as long as you can fit it.

You cannot venture too far in the larger impedance area - it will screw up both 224 tubes Cathodes' potentials, especially the 2nd one.
#18

Personally, I think Terry's (7estatdef) idea has great merit; however, I must add that converting a 65 to operate with AVC is not a project for the novice. I would try it if it were mine.

--
Ron Ramirez
Ferdinand IN
#19

How about something like this?

http://www.ebay.com/itm/220560054014?ssP...1497.l2649

-Ken
#20

If they fit the size, I think you can use them. There will be a little less regulation but you may not notice it that much.

PS. Ohmite still makes those, but for the price you can't beat this Russian deal of yours. And , in my experience, Russian military components are (were that is) very good. They no longer make'em, they buy Chinese.

http://www.mouser.com/Passive-Components...at&FS=True

PPS. You can add a 200 Ohm 2W resistor on either end (to keep the voltages accurate) in series (to bring the total to 1.7K), and see where it works the best, and leave it there.
#21

Thanks for all your great advice everyone! I put in the Russian surplus rheostat and it works great! I'm now in the process of stripping the body with Citristrip , which works great and you can use it indoors.

Thanks again,
Ken




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco Model 80 Transformer resistance
Just forget this number, it is useless anyway. Simply proceed with your project.morzh — 10:08 PM
Philco Model 80 Transformer resistance
My $0.02 is that it is a misprint. I tried to look up the value for the similar 84 and 37-84, and ther is no resistance...MrFixr55 — 09:51 PM
Philco Model 80 Transformer resistance
Thanks for the quick reply! Hmm...well that's good, so what am I seeing that's 1042 ohms on the schematic for the pow...Mike L — 08:46 PM
Philco Model 80 Transformer resistance
The DC resistance of the primary is 8 to 9 Ohm.morzh — 07:54 PM
Philco Model 80 Transformer resistance
I have a feeling the primary winding on the power transformer is bad. My resistance reading on the primary side is 9 ohm...Mike L — 07:48 PM
Rusty Tuning Condenser
I would try Naval Jelly and use a soaked pipe cleaner to get it where it needs to go.RossH — 06:56 PM
38-10T chassis Restoration begins
Hello Dconant , they sold mica to use as a insulator between transistors and their heatsinks too. Rob I will remove th...radiorich — 02:52 PM
38-10T chassis Restoration begins
Thanks for the info guys. I always wondered why the use of mica. Now I know.dconant — 01:52 PM
38-10T chassis Restoration begins
Most common plastics have a dielectric constant in the 3-4 range whereas mica is around 6. This means that even if you w...Steve D — 01:46 PM
38-10T chassis Restoration begins
It is acceptable but not desirable. Plastic is not an approved cap dielectric, and even though a reasonably thick piece...morzh — 11:52 AM

[-]
Who's Online
There are currently 3837 online users. [Complete List]
» 1 Member(s) | 3836 Guest(s)
Avatar

>