The PHILCO Phorum
38-7 Chairside Concentric Tuning Dial - Printable Version

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38-7 Chairside Concentric Tuning Dial - LJB - 01-18-2022

The glass is cracked on the Concentric Tuning Dial of my Philco 38-7CS chassis.  The easy part was removing but I am not smart enough to figure out how to remove the glass from the bezel.  The part's list shows as one part number so does that mean the glass cannot be changed?

RE: 38-7 Chairside Concentric Tuning Dial - Ron Ramirez - 01-19-2022

Please post a photo of the back of the bezel; this will allow folks to see how the glass is held in place.

Theoretically at least, it should be replaceable some way or another.

If nothing else, you could look for and find a 38-7 parts chassis with good glass, and use that part instead.

RE: 38-7 Chairside Concentric Tuning Dial - LJB - 01-19-2022

There is a 'ring' around the inside holding the glass but not a c-clip ring.  Not sure how the ring is held in place but it's not budging even after beating on the glass with rubber mallet.  I can't get anything between the glass and the ring.

Last resort will be to break the glass and see if the ring is removable.  I was hoping someone had changed the glass and could help.

Where do I get a parts chassis?  I haven't found any in my search.

Thanks for the reply.

RE: 38-7 Chairside Concentric Tuning Dial - Ron Ramirez - 01-19-2022

Hmmm. I've never had this happen so can't really comment on it. Anyone else is most welcome to chime in...

> Where do I get a parts chassis?

You can start by placing a "wanted" ad right here in the Phorum's Wanted Ads section.

Other sources:

eBay (often too pricey, though).
Parts sellers such as Wilbur Gilroy. Others may be found in the Phorum's Resources.

RE: 38-7 Chairside Concentric Tuning Dial - Paul Philco322 - 01-19-2022

I only have one set an Airline that had that type of a glass, fortunately it was in fine shape. It may be that over the many years of it's existence that any little gap or spacer that was there has filled in, shrunk, rusted into oblivion. Have you tried carefully scraping along the inner corner of the ring to see if there is some type of a clue concealed to the naked eye. Perhaps that might assist in figuring a removal.

Your photos are good I magnified til I started to lose resolution and I see your point, do you have a source for replacement glass with similar shape?

Paul

RE: 38-7 Chairside Concentric Tuning Dial - LJB - 01-19-2022

https://dialcover.com/jmpalm/Inventory.htm

I ordered the glass assuming I was smart enough to replace but I thought wrong.  I'm waiting on the new glass to 'compare' with the existing glass for a clue.  I'll contact jmpalm for any suggestions he might provide.  If he is selling the glass, it must be replaceable.

I've scraped along the ring and the bezel but can't determine if one solid piece or if pressed to fit.  The brass part is one piece.
The fact that Philco only lists one part number for the whole assembly is concerning.

RE: 38-7 Chairside Concentric Tuning Dial - OZ4 - 01-19-2022

You might try some heat. I would bake it in the oven for awhile to see if the it comes loose while it's hot.

RE: 38-7 Chairside Concentric Tuning Dial - Paul Philco322 - 01-19-2022

Yes Mark Palmquist might be a good one to ask, and you will figure it out. Btw -I have posed this query the my pals in the New England Vintage Electronics Club, if I get some good info. will let you know.



Paul

RE: 38-7 Chairside Concentric Tuning Dial - Paul Philco322 - 01-19-2022

Got this in my group....maybe helps?

From the responder Tony: "I have a few 38-7's and in order to replace the bulb I remove the tuning and vernier knobs in order to get at the 2 screws securing the brown round bezel. If you pull the tuning knob all the way out, there is a small hole drilled straight through the shaft (may have to press the vernier knob in to see it). What I do is use a small nail through the hole to keep the shaft from turning while using a large blade screwdriver to remove the retaining screw at the end of the tuning knob. From that point you should see the two screws that secure the bezel. Once the bezel is removed, the glass is removed by turning it to 'unlock' it from small keeper pins and pulling straight off. Carefully pull the indicator needle straight off, remove the circular retaining clip from the edge of the dial, and the dial face should come off revealing the bulb at the top."

It sounds like your friend may be at the point where he just needs to turn the glass in the bezel?


Maybe the answer?

Pablo

RE: 38-7 Chairside Concentric Tuning Dial - LJB - 01-19-2022

I emailed Mark Palmquist who is sending the glass I need.  He just replied he has changed the glass on the 38-7 bezel before and the part on the back is a friction ring and if I send him the bezel, he will install the new glass, so I'll let experience guide him.

I want to thank everyone for the help.  Glad I found this group and look forward to being a part.

RE: 38-7 Chairside Concentric Tuning Dial - LJB - 01-23-2022

I decided to do the glass replacement myself.  I removed the old glass and found what looked like old black rubber and don't know if it was originally a 'gasket' or if it was some type of adhesive.  I soaked the adhesive with alcohol and removed what I could see. 

I noticed the friction ring was held in place by indentations from the brass piece.  See picture.  I used a 1/16in drill bit and drilled out the indentations, but the ring still wouldn't move.  The drilled holes will not show once assembled.

I then soaked the space between the ring and the outer brass cover with alcohol and finally sprayed it with penetrating oil (PB Blaster) every hour for a few hours and let it sit overnight.  Next morning the ring slid off with a little pressure.

I haven't decided what I'm going to use to replace the old rubber.  RTV or rubber cement.  The ring fits tight, just need something to keep the glass solid.

I want to thank everyone for the help.  Gave me the courage to move forward on my own.

RE: 38-7 Chairside Concentric Tuning Dial - Ron Ramirez - 01-23-2022

Congratulations, good job. I'm not aware of anyone I know having ever done that.