[NostalgiaRadioTime]

I'm having some difficulty deciphering the "condenser box" on top of the chassis and am wondering if I have another pair of eyes verify the polarity of the 3 e-caps and their connection points?

The schematic is a bit hard to read but it appears there are just three 8 mfd caps, #46, 47 and 48. Do all of the negatives go to chassis ground? The label on the box reads:

Pos 8 mfd....Green
Neg 8 mfd....white

and then

Pos 8-8 ... Red
Com Neg... black

The white wire was connected to chassis ground, but all the other wires coming out of the box were cut and so I have no idea where the black wire was supposed to be connected. Someone apparently started to recap it and gave up.

With 5 wires coming out of the box and only 3 capacitors, that tells me two are joined together somehow but I'm not seeing it on the schematic.

Supposedly there is an early and late version of this schematic and I have only found the late version. This one seems to be correct, however the 75 tube and the 6D6 tube behind it are reversed in the actual chassis from what the chassis layout shows on the schematic.


   

[Mondial]

Looks like there was one 8 uF 350V cap (#46) which was isolated and connected to the green and white wires. Then there are two 8 uF 450 V caps (#47 ,#48) which have a common ground (com neg) black. So there are your 5 wires, two for #46 and three for the #47 #48 pair.

According to the schematic it appears that all the negatives connect to chassis ground but I am not sure that's correct. Normally the caps #47 and #48 would have their negatives connected to the power transformer center tap before the bias resistor #14 and #15, not to chassis ground.

[RodB]

According to the schematic, the white and black go to ground, the green goes to the junction of 11 & 12 voltage divider, one red goes to the end of the voltage divider at 11 and the other red goes to pin one or four of the 80 tube.

[NostalgiaRadioTime]

Here's a pic of the label on the capacitor can. This appears to be the factory original can:

   

There are 5 wires in total coming out of the can. Four of the 5 were clipped, only one of them, the white (or what appears to have once been white) wire is still connected to the chassis.

I tried connecting the 3 e-caps with their negatives all connected to chassis ground and positives to the connection points indicated on the schematic:

1.) positive of #46 between #11 & #12 on the candohm and to #9 the 110K ohm resistor
2.) positive of #47 to pin 3 of the 42 tube, to the output transformer, and to one side of the FC
3.) positive of #48 to the opposite side of the FC from #47, and to the filament of the 80 tube

After a full recap and out of tolerance resistor change, tracing through the schematic as I did to verify their locations (not just "shot gunning" it), all I get is a loud buzz that is not controllable with the volume. I even disconnected the high side of the volume pot so that just the wiper and grounded end are in circuit (in theory to isolate the output section from the RF) and I still get the buzz. Somehow I don't think all of the ground symbols are actual chassis ground. But which is which is the mystery

[Mondial]

Greg, as i mentioned above, I believe there is an error in the schematic regarding the connection of the negative of caps 47 and 48. I don't think they should connect to chassis ground, but rather to the center tap of the power transformer. Connecting the negatives as shown on the schematic will cause all the ripple current to pass through the bias resistor, creating a hum.

Try disconnecting the negative lead of 47 and 48 from chassis and connect to the center tap and see if it cures the hum.

[RodB]

Sounds like Mondial is going in the right direction. If that fixes the hum be sure to check the bias voltages.

[morzh]

Greg

You are turning into Kirk.
Halsons are his domain!

[NostalgiaRadioTime]

You were absolutely right, Mondial. That was it. This was about the worst schematic for errors I'd ever seen. Not just showing all the e-caps going to ground, which clearly doesn't work (I had them like that and had the non-controllable buzz), but showing the tubes in the wrong places in the chassis! To further complicate things, as found the grid cap wires were not going to the correct tubes either! This was the first radio I actually had to trace out the circuit to find which grid cap went where! So the set is playing now, but I'm not out of the woods yet. I'm dealing with an intermittent volume drop / bad connection on one of the 6D6 tube sockets that seems to be related to the goat shield. So I have that to sort through yet but at least the buzz is gone and it's receiving stations!    Thanks to all for their help and knowledge 

[NostalgiaRadioTime]

Haha! Mike after this first Halson, Kirk can have them! Call me unimpressed with their draftsman!

[morzh]

And other things too. But they do have some interesting looking cabinets; maybe this is what attracts Kirk to them.

[Paul Philco322]

They have some cute small sets, almost bot one at a meet, was sold when I went back. It was restored too, by a real good craftsman. Ray Bintliff.

Paul

[morzh]

Paul,

The Ray Bintliff? The one whose book on capacitors I have?