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

38-116 speaker voice coil
#2

First of all, try connecting another p.m. speaker to the secondary of the output transformer and see if the set works. Consider any test speaker you use expendible.

The repair of the connection between the tiny wire from the voice coil to the lug on the frame is a delicate one. If you can get the glue or varnish off the 'spot' where the tiny wires come out of the voice coil on the cone, you can see if the voice coil still has continuity. I would try a tiny amount of acetone or nail polish remover on a small spotting brush, and do blot it very well. If this doesn't work, and you have a delicate hand and a sharp scalpel you could try to remove whatever is there to expose the metal. You can't burn it off, because remember, it's sitting on a piece of paper that is very very old.

Once you have determined that all is well, and the voice coil is not rubbing, you will prevail.

You will have to procure a small length of wire similar to what is on he other side. I have used bits and pieces of old phono cartridge shield wire, must have been decades ago in a similar rescue mission. Somebody on this forum probably has a roll of it and will step up and send you few inches of it, which will be a lifetime supply.

Anyway, once you have an exposed clean contact area, the most delicate of soldering jobs must be done to attach the wire to the spot on the cone. Tin the wire first, and make the connection quickly. Reinforce the immediate area around your join with the glue of your choice, and allow it to cure thouroughly. You then punch a small hole through the cone (away from the tiny wire from the voice coil, using a pin and gently enlarge it to accomidate the wire, feed the wire back to the terminal on the frame of the speaker, leave a little slack (look on the good side to estimate how much) so it can traverse the spectrum of the sound it should reproduce, and solder the other end. Finished!

There are as many ways to repair a cone as there are remedies for the common cold. Everything from toilet paper and elmer's glue to silicone putty, to rubber cement. What you want in the end is something that moves freely, is properly centered to avoid rubbing and buzzing, and works. Every tear, missing piece, and hole should be addressed to make this happen.

If you want inner beauty as well, and the set is otherwise OK, you can get the speaker re-coned. The experts who do this can take care of all this.

I have a similar set awaiting a dial plate, and the speaker was a basket case as well. It had all sorts of paper tape and glue all over it, and I reversed most of it. Looks like H**l, but plays pretty good.

Have fun. Now we'll hear from people who know much more about this stuff than I do, with even better suggestions


Messages In This Thread
38-116 speaker voice coil - by dixierat - 08-28-2009, 03:31 PM
Re: 38-116 speaker voice coil - by codefox1 - 08-28-2009, 05:45 PM
Re: 38-116 speaker voice coil - by Jim Berg - 09-02-2009, 11:22 AM
Re: 38-116 speaker voice coil - by dixierat - 10-08-2009, 08:31 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco Model 38-7: what caps & resistors do fail typically?
Since you stated earlier, you have a console 38-7XX.  They also had a 38-7T (table), and 38-7CS (chairside).  A very nic...GarySP — 01:18 PM
Part numbers to model cross
That I wouldn't know, but sometimes the radio document itself shows one, same as the capacitor cans' etc pinouts.morzh — 12:46 PM
Part numbers to model cross
Thank you morzh, that is exactly what I was looking for. Now , is there some where that shows pinouts for Philco power ...Jim Dutridge — 11:37 AM
Restoration of the Canadian General Electric A-87
Thanks for your help Michael. In fact, this video is only an intermediate result. Later I had to apply another tinting l...RadioSvit — 09:01 AM
Restoration of the Canadian General Electric A-87
Great job on the cabinet. PS. In the US notation, "kenotron" refers to specific type of tubes; we call re...morzh — 08:24 AM
Part numbers to model cross
This document has at least some tables of models and parts used. Example: Choke 32-7572, used in 604 radio. Search f...morzh — 08:19 AM
Restoration of the Canadian General Electric A-87
I also checked all the radio tubes on my Hickok 530 tube tester. The 5Z3 kenotron turned out to be faulty, all the other...RadioSvit — 08:02 AM
Restoration of the Canadian General Electric A-87
Well... While the varnish is drying up, I started repairing the chassis... Of course I started by replacing the pa...RadioSvit — 07:12 AM
Philco Model 38-7: what caps & resistors do fail typically?
Hello Martin, Welcome aboard our little community what great Model 38-7 Sincerely Richardradiorich — 12:30 AM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum Martin. I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM

[-]
Who's Online
There are currently 1334 online users. [Complete List]
» 1 Member(s) | 1333 Guest(s)
Avatar

>