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 Post subject: Next project A model 87 Philco
PostPosted: Apr Wed 02, 2014 2:41 am 
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Joined: Oct Mon 22, 2012 2:30 am
Posts: 255
Location: Saint Louis, Mo
Since we just finished a model 112X the model 87 should be a snap. Don had this one sitting in his shop for God knows how long. I was tempted to buy it from him but nah. The cabinet is beautiful and the chassis still has some globe tubes in it.Image as you can see from this picture we have a few in the wings awaiting some attention, the 37-116 is almost done with just the magnetic tuning alignment to do.ImageImage


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 Post subject: Re: Next project A model 87 Philco
PostPosted: Apr Wed 02, 2014 2:48 am 
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Joined: Jan Mon 18, 2010 2:13 am
Posts: 22166
Location: Dayton Ohio
The 87 is a very nice radio.
The main issue I had with my 87 was the plate windings of the RF transformers/coils.

A couple of them were open. They are easy to rewind as they are only about 15 turns on top of a celluloid insulator over the main winding. Just be sure to wind them in exactly the same spot, and direction as the old one.

Good luck with your Philco! :D

-Steve

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-Pre-War FM
Consoles and floor models, the bigger, the better!


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 Post subject: Re: Next project A model 87 Philco
PostPosted: Apr Wed 02, 2014 8:23 pm 
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Joined: Jan Wed 23, 2013 4:16 pm
Posts: 2380
Location: Central Florida, 32765
I hope you keep us posted on the progress of your restoration. I have a model 87 sitting in the corner just daring me start in on it. I'm not sure I am quite ready for it but might learn some good information from your restoration. Looking forward to it.

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Joe
Seriously, what's the worst that could happen?


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 Post subject: Re: Next project A model 87 Philco
PostPosted: Apr Thu 03, 2014 3:46 am 
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Joined: Dec Mon 05, 2011 1:10 am
Posts: 400
Biggest performance problem I know with this set is AC HUM.

Seems like the 1st audio amplifier stage is super fussy about the characteristics of the #26 tube you plug in there.
Suggest you try all your 26's till you get the least hum. Adjusting the filament balancing potentiometer is also critical,
but some tubes are definitely less hummy than others, no matter the pot adjustment.

But still, don't expect a miracle. This was one of the earliest AC circuits, and the #26 tube is really nothing much more than
a half-fast attempt to make the ancient 01-A work on AC ... sorta worked, but the slightly later indirect-heated tubes were
MUCH quieter.

I once wasted a bunch of time beefing up the B-supply filtration on one of these sets before I figured out that the hum
was coming from the tube filament, and no amount of B smoothing would kill it.

I suspect that this problem is likely to be present in most all those late '20's radios before they switched over to #24, 27, 35, etc.
tubes, but I only know for sure about the Philco 87.


^^;;^^

Morc


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 Post subject: Re: Next project A model 87 Philco
PostPosted: Apr Thu 03, 2014 9:42 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9401
Location: ID 83301
These things never have good clear sound .


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 Post subject: Re: Next project A model 87 Philco
PostPosted: Apr Wed 09, 2014 9:00 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1068
Location: Tucson AZ
My first complete restore was one of these for my mother-in-law, (rip Betty).

Turned out awesome. Reception was good as was sound, for what the console is.

I also had some help from some people here in regards to set of good tubes as well as a good clean set of schematics.

If you could use the schematics, I'll get you a copy.


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 Post subject: Re: Next project A model 87 Philco
PostPosted: Apr Wed 09, 2014 11:11 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 10298
Location: Beaver Falls, PA. USA
Watch out for open speaker field and audio transformer windings, in Philcos of that era.

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Tim KA3JRT


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 Post subject: Re: Next project A model 87 Philco
PostPosted: Apr Thu 10, 2014 4:34 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1068
Location: Tucson AZ
I think I might be mistaken about the set I reworked because the documents I have, with some notes that I wrote were for a Model 95 although the Philco service info covers the Model 511, 86, 87, 65, 95, 76, 96, 77 and 20.

Can someone verify the differences between the chassis of the 87 and 95?


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 Post subject: Re: Next project A model 87 Philco
PostPosted: Apr Thu 10, 2014 3:11 pm 
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Joined: Jan Mon 18, 2010 2:13 am
Posts: 22166
Location: Dayton Ohio
Well, the 87 is a neutrodyne type circuit using 26 triodes as RF amplifiers.

The 95 uses 24A Screen Grid Tetrodes and also was one of the first radios to use AVC. Therefore the 95 should run circles around the 87 as the 24As have plenty more gain and they are AVC controlled.

Both have a 4 gang variable capacitor and 3 stages of RF.

-Steve

_________________
Radio Interests
-Zenith
-Sparton
-Pre-War FM
Consoles and floor models, the bigger, the better!


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