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Is Anyone going to be restoring a model 70 soon? - Printable Version

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Is Anyone going to be restoring a model 70 soon? - Music in a bottle - 12-16-2009

I'm gearing up to recap mine and do a minor restore of the coils and so on. Thought if one of you was embarking on a reastore too, I could bounce ideas off you and tap into your knowledge.

Re: Is Anyone going to be restoring a model 70 soon? - Ron Ramirez - 12-16-2009

I am not, but I've restored a few in my time. So feel free to fire away with your questions; either myself or someone else will be here to help, I am sure. Icon_smile

Re: Is Anyone going to be restoring a model 70 soon? - Chuck Schwark - 12-16-2009

And also remember that there are TWO versions of the Model 70; Early without AVC and Later version with AVC.
Be sure you are using the correct schematic. See the Schematic Section here. Your serial number determines this.

If you cannot find the stamped serial number on your chassis, just look underneath the chassis and if the VOL control is a DUAL gang pot, then you have the EARLY version.

Good luck,

Chuck

Re: Is Anyone going to be restoring a model 70 soon? - Music in a bottle - 12-16-2009

Thanks for the heads up! I was fixing to get a schematic real soon too. I've been pouring over all the links you have here like the bit on rebuilding the electrolytics. It's going to be fun! I look foreward to it. I have a mouser catolog, I believe that's who it is. Any better recommendations for purchasing parts?

Re: Is Anyone going to be restoring a model 70 soon? - Chuck Schwark - 12-16-2009

Look at the Resources section here on Ron's site (or mine) for suppliers
who cater to the antique radio hobbyist. Pays to patronize them.

Happy Holidays,

Chuck

Re: Is Anyone going to be restoring a model 70 soon? - Music in a bottle - 12-16-2009

we'll do. Thanks guys.

Re: Is Anyone going to be restoring a model 70 soon? - Music in a bottle - 12-17-2009

My dad, who knows my skill level with regards to this restoration, has advised against rewinding the IF coils. Ron, I will be sending these to you at some point this winter or early spring. Hope you still do them these days!

Re: Is Anyone going to be restoring a model 70 soon? - Ron Ramirez - 12-17-2009

I don't rewind IF transformers, sorry! Only antenna, RF and oscillator coils of 1928-1935 Philco models.

Re: Is Anyone going to be restoring a model 70 soon? - Music in a bottle - 12-18-2009

I was speaking of the 2 coils in the canisters. I'm likley mistaken, but I thought thet were IF coils. My dad seemed confused about them, but I think maybe it's me! Icon_redface

Re: Is Anyone going to be restoring a model 70 soon? - Ron Ramirez - 12-18-2009

There are a total of five aluminum shields on the 70 chassis. Those shields are spun on and cannot be removed without destroying them. The smallest ones house the IF transformers. The other three are for the antenna, RF (detector) and oscillator coils, respectively.

I redid a 370 Lazyboy a year or so ago. I'm still not satisfied with its performance. I should contact Etech and get his paper on converting the early 70 to use AVC. Ed Locker and I came up with a circuit to do that, I'd like to see if Etech's method differs.

Re: Is Anyone going to be restoring a model 70 soon? - Music in a bottle - 12-18-2009

Ron Ramirez Wrote:There are a total of five aluminum shields on the 70 chassis. Those shields are spun on and cannot be removed without destroying them. The smallest ones house the IF transformers. The other three are for the antenna, RF (detector) and oscillator coils, respectively.

I redid a 370 Lazyboy a year or so ago. I'm still not satisfied with its performance. I should contact Etech and get his paper on converting the early 70 to use AVC. Ed Locker and I came up with a circuit to do that, I'd like to see if Etech's method differs.
I'd be very in terested in that info, just to be informed if anything else. I'm certain it's over my head though. For the mean time, I'll just hope those coils keep working.......

Re: Is Anyone going to be restoring a model 70 soon? - Guest - 12-21-2009

Hi, I'm restoring an early 70 chassis now. I've restuffed bakelites and lytics which was not too difficult. The detector transformer is open on primary which is pretty common (part #03083).I'm trying to decide if I should try to rewind myself or see if Ron can do it. I'm not sure of gauge wire or number of turns. Unwinding it will just break and looks awful fine to be able to count wraps with a needle or stylus. I'm also waiting on a replacement bakelite block that was missing. Hopefully the power transformer is good. Radio Daze is offering free shipping now and I think AES is offering a 10% discount until end of year, so now is a good time to order parts (check to be sure when ordering). Just Radios is a good source for caps. Mine is turning out to be a labor of love. Bought it for less than $20.00 at auction, but only because it looked so rough.I reglued delaminated grill and replaced veneer on arch and cabinet looks good now. It's been stripped but I'll probably wait till warmer weather before I spray any lacquer. I also found two bad tubes but I had spares. I restored a model 20 deluxe that was in just as bad a shape and it turned out great; but I couldn't of done it without the help of the nice folks on these forums. I'm confident your project will have same results. Bill

Re: Is Anyone going to be restoring a model 70 soon? - Music in a bottle - 12-22-2009

EXCOT Wrote:Hi, I'm restoring an early 70 chassis now. I've restuffed bakelites and lytics which was not too difficult. The detector transformer is open on primary which is pretty common (part #03083).I'm trying to decide if I should try to rewind myself or see if Ron can do it. I'm not sure of gauge wire or number of turns. Unwinding it will just break and looks awful fine to be able to count wraps with a needle or stylus. I'm also waiting on a replacement bakelite block that was missing. Hopefully the power transformer is good. Radio Daze is offering free shipping now and I think AES is offering a 10% discount until end of year, so now is a good time to order parts (check to be sure when ordering). Just Radios is a good source for caps. Mine is turning out to be a labor of love. Bought it for less than $20.00 at auction, but only because it looked so rough.I reglued delaminated grill and replaced veneer on arch and cabinet looks good now. It's been stripped but I'll probably wait till warmer weather before I spray any lacquer. I also found two bad tubes but I had spares. I restored a model 20 deluxe that was in just as bad a shape and it turned out great; but I couldn't of done it without the help of the nice folks on these forums. I'm confident your project will have same results. Bill
The old radios really do fascinate me. I'm admittadly out of my league but just really am ambitious, and if it blows up, well, It will still look good on the end table! You have a link to some pictures of your set?

Re: Is Anyone going to be restoring a model 70 soon? - Radioroslyn - 12-22-2009

I'm new to the list and have started a resto on a Philco 370 chairside. For those who are unfamiliar it is a 70 chaiss in a chairside cabinet. The front of the chaiss uses a couple of brackets and a 90 deg coupler to bring the concentric tuning and volume control up thru the top of the cabinet. Have done most of the electronics. Recapped and repaired an open ant coil. All works well. Was very interested to read about adding avc to this early model set.Seems like a worthwhile indever The cabinet needs a lot of work. Unfortunately it spent some time in a shed and the top is a bit warped and has a burn. It's in traction now being clamped to several pieces of angle iron. Also moron decided to drill two hole in the side, one for a tone control and the other for an off/on switch. (original is part of the dual gang volume made of unubtanium) Badly needs to be refinished. Some pic's are here:
http://www.flickr.com/photos/42774321@N08/
Really have enjoy reading the posts and am looking forward to being a help here!
Terry N3GTE
near Philcocentral (Phila,Pa)

Re: Is Anyone going to be restoring a model 70 soon? - Music in a bottle - 12-22-2009

Looks like it has a great deal of potential! I never realized the chairside went back that far. Thought Zenith was the folks who conceived the chairside? You just gotta love that 70 chassis. Ron will likely correct me, Icon_wink but they sure seem simple!