Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

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

Model 89 Code 123 Bandswitch Stuck
#1

I'm working on a model 89 code 123 and the bandswitch is very tight. I've sprayed it with contact cleaner and WD40. I can barely turn it. I don't want to break it. Is there any secret to loosening these up?

The artist formerly known as Puhpow! 8)
#2

My first thought is some type of penetrating oil where the shaft travels through the mounting screw for the switch. WD40 would be my first choice as well. If this doesn't work, I would remove the switch and carefully disassemble it to see what is inside. Perhaps its just gunked up on the inside.
#3

That's a good idea Eric. It only has a few wires going to it, so removing it shouldn't be too tough. I wonder if they are difficult to disassemble?

The artist formerly known as Puhpow! 8)
#4

I agree, the lock up is no doubt on the shaft and not the wafers. I had one that I couldn't turn with vice grips on it. A squirt of PBblaster penetrating oil and wrapping the shaft with a damp paper towel and hitting the threaded area with a propane torch on a fine flame to warm it and it started to move. Repeated several times and it was free. Repeated heat on the bearing area while keeping the shaft relatively cool and the penetration oil did its job.
Good luck and don't burn down the house.Icon_lol
Jerry

A friend in need is a pest!  Bill Slee ca 1970.
#5

Thanks Jerry.. I'll try the flame tomorrow. I'll let you know how it turns out. If you see a Model 89 Cabinet for sale, you'll know it went bad...lol

The artist formerly known as Puhpow! 8)
#6

The heat trick sounds like it is worth trying before disassembly. Be careful what type of lube you use, some of them are pretty flammable and you don't want have them flash on you with a torch.

As for disassembly, there are usually metal tabs on the back of the pot/switch that will hold the metal casing closed. You can usually use a small screwdriver or needle nose pliers to gently straighten them out and open the back of the case. I've done this on a few other electronic devices with good success.

You sure have been doing your part to bestow the world with nice radios lately! After work, kids, dinner, and more work, I'm lucky to get an hour in the evening to work on things, so my projects progress much more slowly!
#7

I would use a large soldering iron rather than a flame.

Steve

M R Radios   C M Tubes
#8

Somehow I think "Liquid wrench" being a penetrating grease will do the job even without the torch.
My Zenith tuning shaft was very stuck. Did not take long, dissolved the gunk and lubricated it.
It's been close to two years, still runs smooth.
#9

Ok, change of plans.. I'll go with
Liquid Wrench... if that doesnt work
Soldering Iron heat...
Maybe flame..

in that order..

Thanks Eric.. My kids are grown, and my work consists of about 6 hours a day on the cell phone. I'm lucky in that respect because it gives me plenty of opportunity to spend time looking for radios and fixing them up.

The artist formerly known as Puhpow! 8)
#10

Liquid Wrench did the trick! Icon_thumbup

It turns so easy now, I might need to tighten it up.. Icon_lol

The artist formerly known as Puhpow! 8)
#11

Yeah, lithium plus kerosene works wonders. On all things stuck and on some mentally ill.
#12

Glad to hear it worked! Liquid wrench is what I had in mind, I just couldn't remember the name of it...
#13

Although those old pots are of better quality than newer ones, those "tabs" will only allow a couple of unbendings before they break off. Glad to hear the fluid worked for you.
#14

Exactly - those tabs provide limited access before they allow permanent access... Once is good, repeated use will certainly cause breakage.
#15

Aye A little spare deoxit on the contacts is called for for the next few decades.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
1949 Motorola 5A9M
Thx Arran, I will check the antenna connections. Right now the loop is alligator clip connected to the chassis since you...klondike98 — 03:58 AM
1949 Motorola 5A9M
Bob; I was just thinking that maybe the 1R5 tube doesn't like being operated at 1.2 volts on the filament, though you...Arran — 12:56 AM
Philco J1720 stereo and record player with reverb
So I just purchased a Philco J1720 stereo and record player. That has some static when turning the knobs. Wanted to see ...PhilcoJ1720 — 12:26 AM
1949 Motorola 5A9M
I've started looking into the very weak and garbled reception in the set (I have the HS-62A version of the chassis seen ...klondike98 — 12:00 AM
A Marconi model 86
Those last photos were not very good,so I  used one of my other cameras. This is more like the true colors of the radio....Dan Walker — 10:48 PM
Philco 42-345 Restoration/Repair
If you look closely at the paper wax capacitors they probably have something like "outside foil" near the blac...RodB — 10:41 PM
A Marconi model 86
Hello Dan, That really turned out very nice and I also like that color it is not to dark . I Have General Electric m...radiorich — 08:50 PM
Table radio 51C or 52C?
The model 51 and 52 are identical mechanically, I'm not sure what may have been changed between the two chassis but one ...Arran — 08:18 PM
A Marconi model 86
Well today I  installed the grill cloth board and the speaker.  The speaker must weigh 20 pounds by itself. I put the c...Dan Walker — 08:10 PM
Unidentified Philco Bakelite
It's a British Philco, likely from the early 1950s. It has a very common layout for British sets starting in the post wa...Arran — 08:02 PM

[-]
Who's Online
There are currently 515 online users. [Complete List]
» 1 Member(s) | 514 Guest(s)
Avatar

>