Philco 37-650 mystery wires - Printable Version
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Philco 37-650 mystery wires - Tgace459 - 01-07-2017
Schematic reading/wiring assistance needed!
Im working on a Philco 37-650
http://www.nostalgiaair.org/Resources/219/M0013219.htm
I have a few disconnected/cut wires that I cant seem to figure out where they are supposed to connect.
The first one is this green/yellow wire coming off of pin 4 of the 6K7G tube. The other wire routes around to a bakelite block cap on the other side of the chassis but the other wire is cut/broken and I cant find another stub that looks like the same wire.
[Image: https://scontent-ort2-1.xx.fbcdn.net/v/t1.0-9/15826078_10212079126360551_6744532694401619603_n.jpg?oh=5546c8e0056bec2789d5f3849b3628ac&oe=5913107E]
The Next one is this mysterious stub on pin 5 of one of the 6F6G output tubes.
[Image: https://scontent-ort2-1.xx.fbcdn.net/v/t1.0-9/15965278_10212079147681084_8114749687682868045_n.jpg?oh=31f11245cd2d7c2bed08d3f987aac6e5&oe=5912CC8A]
Can anyone help?
RE: Philco 37-650 mystery wires - Radioroslyn - 01-07-2017
>pin 4 of the 6K7G tube
Which 6K7 ? The rf or IF amp.
RE: Philco 37-650 mystery wires - Tgace459 - 01-07-2017
The IF....
RE: Philco 37-650 mystery wires - Radioroslyn - 01-07-2017
Goes to the junction of 61 and 62.
The pic of the 6F6 looks like you are asking about pin 4 not pin 5. 4 goes to a 3.5k resistor and it in turn is connected to pin 4 of the other 6F6
RE: Philco 37-650 mystery wires - Tgace459 - 01-07-2017
The second wire on that pin goes to the 61/62 point....From the schematic I cant quite figure out why theres even another wire attached to pin4.
The other stub is definitely attached to pin 5 of 6F6 along with two resistors and a paper cap. The cap which isnt on the schematic and at first glance appears to be a recap of the .03 mfd bakelite block its attached to.
I think the previous owner had some work done on it ages ago and these stubs may be the remainder of some repairmans work....
RE: Philco 37-650 mystery wires - Tgace459 - 01-07-2017
Now that I look at it...I think that 6f6 stub used to be the connection to bakelite block #45. I think it was cut and the .03 mfd paper cap was strung between 6f6 and #45......
RE: Philco 37-650 mystery wires - Radioroslyn - 01-07-2017
Each of the 6F6's should have a paper cap (whether it's loose or in a bakelite block) connected to pin 5. one come from pin 4 of the other 6F6 and the other cap comes pin 3 of the 6K5.
Pin 4 of the 6K7 has a connection over to pin4 of the 6A8
RE: Philco 37-650 mystery wires - Tgace459 - 01-07-2017
A ha! I think thats it! there are some bits of wire on that pin that could be where it broke free....theres also a wire from pin 4 of 6A8 to pin 4 of 6K7G (RF).
Right now there is only a wire from pin 4 of 6A8 to pin 4 of 6K7 (rf). Nothing else ...
RE: Philco 37-650 mystery wires - Tgace459 - 01-07-2017
I believe that while removing the subchasis I may have missed the wire between 6k7 (if) and 6A8 when I was marking and cutting and mistakenly pulled it off the pin while removing.....
RE: Philco 37-650 mystery wires - Tgace459 - 01-08-2017
Many thanks!
Got her playing for the rest of the recap and restoration....
RE: Philco 37-650 mystery wires - Radioroslyn - 01-08-2017
(01-08-2017, 08:14 PM)Tgace459 Wrote: Many thanks!
Got her playing for the rest of the recap and restoration....
Good Job!!!