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

40-201 had shorted capacitor
#6

All the old paper type capacitors have now been replaced and most of the resistors as well. There were a few exceptions. Some resistors were 20% types and bridged across an inductor. I left those alone as they are just there for reducing the Q of the circuit to broaden response. Some of the bypass capacitors in the front end and IF strip could be well served by .01 disc ceramic capacitors which would have shorter leads and less inductance added to the circuit. However, it is not critical since the IF is only 455kHz. In the RF it could be a potential issue as the SW high band operates up to 18mHz which could be an issue depending on other circumstances. All in all, I have to say the radio works quite well as it is. The last order of capacitors from tubesandmore also took care of replacing the new electrolytic that had shorted intermittently. The new one has a 450VDC rating while the one first used was only a 300VDC unit. It proved not to be able to handle warm-up voltage surges.

Joe


Messages In This Thread
40-201 had shorted capacitor - by Joeztech - 12-22-2013, 11:05 AM
RE: 40-201 had shorted capacitor - by morzh - 12-22-2013, 01:08 PM
RE: 40-201 had shorted capacitor - by Eric Adams - 12-22-2013, 01:36 PM
RE: 40-201 had shorted capacitor - by Joeztech - 12-23-2013, 09:05 AM
RE: 40-201 had shorted capacitor - by codefox1 - 12-23-2013, 04:01 PM
RE: 40-201 had shorted capacitor - by Joeztech - 12-29-2013, 07:21 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Restoration of the Canadian General Electric A-87
Thanks for your help Michael. In fact, this video is only an intermediate result. Later I had to apply another tinting l...RadioSvit — 09:01 AM
Restoration of the Canadian General Electric A-87
Great job on the cabinet. PS. In the US notation, "kenotron" refers to specific type of tubes; we call re...morzh — 08:24 AM
Part numbers to model cross
This document has at least some tables of models and parts used. Example: Choke 32-7572, used in 604 radio. Search f...morzh — 08:19 AM
Restoration of the Canadian General Electric A-87
I also checked all the radio tubes on my Hickok 530 tube tester. The 5Z3 kenotron turned out to be faulty, all the other...RadioSvit — 08:02 AM
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

[-]
Who's Online
There are currently 1128 online users. [Complete List]
» 2 Member(s) | 1126 Guest(s)
AvatarAvatar

>