Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

cap questions on model 89 (version 6 schematic)
#1

I really could use another pair of eyes and some good advice here from those more experienced than I. I'm trying to replace the caps in the #7 Filter condenser bank. There are 5 caps in that "bank", each are number 7 on the attached schematic. I'm trying to find where the .09 mfd's go? It almost looks like two of them go to the #44 RF tube on the front corner of the chassis. The other end goes to ground, of course.

The other question I have concerns the #5 bakelite block. There's a .09 mfd cap in the block along with a 300 ohm resistor. Should there be a wire going from one terminal of the block to the #41 (99,000 ohm) resistor? There are two wires coming from the variable capacitor going to the ground terminal on the bakelite block. Is that correct? Also does one wire from this block go to the antenna coil?

I'm sure to most of you, these will all appear to be obvious. I just want to verify that what I'm doing is correct. You can never be too sure! Icon_smile Thanks in advance.

   

Greg V.
West Bend, WI
Member WARCI.org
#2

It looks like 1 .09 goes to the grid of both 44's and the 36 the other .09 goes to coil #18 and the ant coil
#3

The #5 block is in series to ground from pin 4 of both 44's. They are probably just using the ground conection on the block because it was the closest/convenient ground.
#4

The cap going to resistor 41 should be a .05
#5

Thanks, tab. My chassis was a mess... someone, sometime long, long ago added and replaced a bunch of stuff and so much of what was reconnected was soldered onto the wrong lugs. I'm going through the schematic with a highlighter pen trying to trace out each and every wire / connection / component. A daunting process. The .05 cap between the 41 & 42 resistors was an easy one to find. But on my chassis, there was a wire going from the #5 block to the 41 resistor. I'm thinking it doesn't belong there.

Greg V.
West Bend, WI
Member WARCI.org




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Restoration of the Canadian General Electric A-87
Well... While the varnish is drying up, I started repairing the chassis... Of course I started by replacing the pa...RadioSvit — 07:12 AM
Philco Model 38-7: what caps & resistors do fail typically?
Hello Martin, Welcome aboard our little community what great Model 38-7 Sincerely Richardradiorich — 12:30 AM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum Martin. I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM
Part numbers to model cross
Jim, We have this index put together by Dale Cook but I don't think that is quite what you are looking for. The Parts...klondike98 — 09:37 PM
Philco Model 38-7: what caps & resistors do fail typically?
Yep the dim bulb test is OK but I'd definitely replace all those electrolytics before I did it. Since those #47 conden...klondike98 — 09:18 PM
Philco 42-345 Restoration/Repair
The resistor is a 2.2 Meg, it was the last one I hadn't replaced. The broadcast is coming in after replacing it.osanders0311 — 09:09 PM
Philco 42-345 Restoration/Repair
What does the resistor measure? I think it should be 3.3 Meg. If the oscillator coil has continuity and the resistanc...RodB — 09:03 PM
Philco Model 38-7: what caps & resistors do fail typically?
Good idea to check the coils... then I'll get hold of an incadescent light bulb and see what happens when the unit is sw...Musaeum — 08:49 PM
Philco 42-345 Restoration/Repair
I have that same set, ain't too much shortwave I like anyway.....it is a good AM DX set. PaulPaul Philco322 — 08:32 PM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum, Martin! Open a new thread in Philco Electronic Restoration when you begin working on your 38-7. ...GarySP — 08:28 PM

[-]
Who's Online
There are currently 1124 online users. [Complete List]
» 2 Member(s) | 1122 Guest(s)
AvatarAvatar

>