Forums :: NEW! Web Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Oct Thu 29, 2020 1:12 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 5 posts ] 
Author Message
 Post subject: Safety capacitor on crosely 529
PostPosted: Sep Fri 18, 2020 1:54 am 
Member

Joined: Apr Wed 08, 2020 12:02 am
Posts: 52
Location: Lott, Tx 76656
Would the #13 capacitor on this Crosely 529 radio schematic be the one that needs to be a safety cap? It call for .05uf cap, i have a .01 safety cap. Would that be ok?


Attachments:
schematic 529 crosely.pdf [160.13 KiB]
Downloaded 27 times
Top
 Profile  
 
 Post subject: Re: Safety capacitor on crosely 529
PostPosted: Sep Fri 18, 2020 2:19 am 
Member

Joined: Nov Tue 14, 2017 5:09 am
Posts: 3082
Location: Austin, Texas
The #13 cap can be type X2 or Y2 since it is line-to-line and not line-to-chassis. A 0.01uF will be OK.

I would move the right end from pin 3 of the 35Z5 to pin2. When the cap is on pin 3, even a temporary short in the cap will burn out the rectifier.
Type X and Y caps can short due to high transient voltages but are designed to burn out the short and continue to function.

Edit: They probably put the original cap on pin 3 of the 35Z5 so the tube would act as a fuse. When the original, non-safety, caps shorted, they would often explode. Better to sacrifice the 35Z5 than set the house on fire.

Jay


Top
 Profile  
 
 Post subject: Re: Safety capacitor on crosely 529
PostPosted: Sep Fri 18, 2020 2:30 am 
Member

Joined: Apr Wed 08, 2020 12:02 am
Posts: 52
Location: Lott, Tx 76656
Will do. Thanks


Top
 Profile  
 
 Post subject: Re: Safety capacitor on crosely 529
PostPosted: Sep Fri 18, 2020 1:27 pm 
Member

Joined: Jun Fri 19, 2009 6:34 pm
Posts: 10031
Location: Long Island NY
The 0.05 uF cap was no doubt chosen to control RF noise and interference that could be picked up by the cord and AC power wiring. There’s actually a lot more of that around today than in the past. If the radio seems noisy or buzzy afterward you might want to re-visit this and put a 0.05-uF back in.

_________________
"Hell, there are no rules here--we're trying to accomplish something!"

Thomas A. Edison


Top
 Profile  
 
 Post subject: Re: Safety capacitor on crosely 529
PostPosted: Sep Fri 18, 2020 2:45 pm 
Member

Joined: Apr Wed 08, 2020 12:02 am
Posts: 52
Location: Lott, Tx 76656
ok :)


Top
 Profile  
 
Post New Topic Post Reply  [ 5 posts ]  Moderators: Norm Leal, Marcc

All times are UTC [ DST ]


Who is online

Users browsing this forum: bob_u, cwysong, Mr. Detrola, VEK and 23 guests



Search for:
Jump to:  
cron


































-->


Privacy Policy :: Powered by phpBB