11-27-2015, 10:44 PM
So I started on this radio (in the November finds in the bar and grill) Pulled the chassis and found this:
[Image: http://i1365.photobucket.com/albums/r745...el5fnf.jpg]
Sweet. the cleanest chassis I've seen in a long time. The missing shields and the GT tubes a bit of a bummer but the speaker looks like new, and zero corrosion. The set was missing a power cord so I replaced it and rebuilt the RFI block cap. The rest of the underside was, well, not ideal.
[Image: http://i1365.photobucket.com/albums/r745...ufc004.jpg]
on the plus side, it is clean as a whistle too, and the chassis mounts in the corners are in good shape. But the repairman has knocked several times, with some shoddy workmanship. After reattaching a broken connection at the .25uF cap in the lower right hand corner, I decided to bring it up on a variac to see where I stood.
No sound, nada, nothing. But I did have B+ and filaments. Get out the ohmmeter and start checking the speaker. Bummer, the output transformer has an open primary. Now where am I going to find the right output transformer on Black Friday? Pull up Ron's speaker listing to see what might have the right one, and bingo, my other November find would have one. So I'm, afraid I wont be restoring this model 60.
[Image: http://i1365.photobucket.com/albums/r745...czspyu.jpg]
So I salvaged the transformer out of my flood victim 60 and it checked good so I installed it into the 37-62 and brought it up on the variac again.
At 70 volts I got a station! No hum so I brought it up to 110 and it played grand. So I started the recap, right to left, rechecking the radio with every change. About 1/2 way through it started squealing like a stuck pig, so I noted where I was at and continued. By the time I was done with the recap, it still squealed like crazy. Flipped the chassis over and found if I put my hand around the 6Q7 the squealing stopped. Put a 6Q7G in its place and grabbed a shield of my already missing several 37-116 and no more squeal.
It is somewhat amazing that 2 of the 3 sections of the Philco electrolytic cap have stayed good for 79 years, I've had it playing on the bench for an hour and it shows no sign of leakage. I'll wind up replacing it, but I'm not sure if I want to restuff or not, there is a large empty space in the chassis forward of the power transformer.
More pics to follow...
[Image: http://i1365.photobucket.com/albums/r745...el5fnf.jpg]
Sweet. the cleanest chassis I've seen in a long time. The missing shields and the GT tubes a bit of a bummer but the speaker looks like new, and zero corrosion. The set was missing a power cord so I replaced it and rebuilt the RFI block cap. The rest of the underside was, well, not ideal.
[Image: http://i1365.photobucket.com/albums/r745...ufc004.jpg]
on the plus side, it is clean as a whistle too, and the chassis mounts in the corners are in good shape. But the repairman has knocked several times, with some shoddy workmanship. After reattaching a broken connection at the .25uF cap in the lower right hand corner, I decided to bring it up on a variac to see where I stood.
No sound, nada, nothing. But I did have B+ and filaments. Get out the ohmmeter and start checking the speaker. Bummer, the output transformer has an open primary. Now where am I going to find the right output transformer on Black Friday? Pull up Ron's speaker listing to see what might have the right one, and bingo, my other November find would have one. So I'm, afraid I wont be restoring this model 60.
[Image: http://i1365.photobucket.com/albums/r745...czspyu.jpg]
So I salvaged the transformer out of my flood victim 60 and it checked good so I installed it into the 37-62 and brought it up on the variac again.
At 70 volts I got a station! No hum so I brought it up to 110 and it played grand. So I started the recap, right to left, rechecking the radio with every change. About 1/2 way through it started squealing like a stuck pig, so I noted where I was at and continued. By the time I was done with the recap, it still squealed like crazy. Flipped the chassis over and found if I put my hand around the 6Q7 the squealing stopped. Put a 6Q7G in its place and grabbed a shield of my already missing several 37-116 and no more squeal.
It is somewhat amazing that 2 of the 3 sections of the Philco electrolytic cap have stayed good for 79 years, I've had it playing on the bench for an hour and it shows no sign of leakage. I'll wind up replacing it, but I'm not sure if I want to restuff or not, there is a large empty space in the chassis forward of the power transformer.
More pics to follow...
John
Las Vegas, NV USA
