Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

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
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM
Preliminary work on wife's Silvertone 2014
Hello roy, that great news glad it worked out for you !! Sincerely Richardradiorich — 10:50 PM
Preliminary work on wife's Silvertone 2014
Safety caps arrived today.  Soldered one in and had a successful first power-up.  No magic smoke escaped and it tunes in...glyphmon — 09:53 PM

[-]
Who's Online
There are currently 1428 online users. [Complete List]
» 1 Member(s) | 1427 Guest(s)
Avatar

>