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

help with an old repair - 40-201 chassis
#35

Philco didn't make this easy when they used the same schematic to show different chassis with different tube counts, with their dotted lines and crossed out connections, especially if you aren't an old hand at reading schematics. After 1940 they didn't do this as much.

I've always found it helpful to make careful diagrams before I change a component or wire, using schematic symbols for resistors and capacitors rather than drawing their shapes, and labeling the values next to them. I draw the wires in with colored pencil, using dotted colored lines for wires with tracers. Before I solder any connection I double check my diagram against the schematic. The diagrams take time, but they give me more confidence that I can put things back the way they were. Slow and steady wins the race. For me, it's more fun and less frustrating that way.

But I still occasionally blow it, like the time I scratched my head a long time when I left off the resistor that supplies B+ to the mixer tube on a 40-190, then did the same darn thing on a 40-150 a few months later!

Except for old repairs, your radio is probably wired correctly, so even if the schematic is confusing, you can always fall back on putting things together as they were, and you'll be right almost all the time.

Your radio is a pretty complicated one to learn on. It does get easier!

John Honeycutt


Messages In This Thread
RE: help with an old repair - 40-201 chassis - by Raleigh - 08-21-2015, 12:02 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
With regard to the speaker, unless the cone is so brittle that it crumbles as soon as you touch it I would try to repair...Arran — 04:07 AM
Philco 42-345 Restoration/Repair
That silver can capacitor is an aluminum electrolytic. You should replace it with an aluminum electrolytic with the valu...RodB — 11:46 PM
Philco 42-345 Restoration/Repair
Thank you Rodb and Gary for helping with clarification on these capacitors. Other than the Tiny 630volt one I'm not sure...osanders0311 — 10:17 PM
1949 Motorola 5A9M
Hello All; I found the CMB41L down in the basement, it is definitely a 1950-51 model, the capacitors have date codes ...Arran — 07:48 PM
Philco 42-345 Restoration/Repair
Hi, all the caps I order, other than the electrolytics, are of the 630V rating. No worries on it being too high, and no ...gary rabbitt — 05:46 PM
Philco 42-345 Restoration/Repair
Hi, there's a lot to consider when designing these circuits so you shouldn't have a lot of concern when replacing caps. ...RodB — 02:03 PM
Philco 42-345 Restoration/Repair
I have ordered and received new caps for this radio and hope I've ordered the correct ones. I tried matching them to the...osanders0311 — 11:35 AM
Philco newbie with P-1891-WA console questions
Hello Jeff , Far as the Electrolytic capacitors go here is a list of parts. that will work . I like using Nichicon and...radiorich — 09:50 PM
Philco newbie with P-1891-WA console questions
Well, I've been stumped at trying to get the first of 11 electrolytic capacitors. I got a schematic and have a list of t...Jeffcon — 07:54 PM
Model 80 Antenna Issue?
Thanks Gary and Rod.  I also found an article in the Philco Repair Bench under Service Hints and Tips, about installi...Hamilton — 12:32 PM

[-]
Who's Online
There are currently 418 online users. [Complete List]
» 3 Member(s) | 415 Guest(s)
AvatarAvatarAvatar

>