Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 7th October 2005, 09:14 PM   #1
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Default Mystery Chokes

I got given these chokes (2 the same) -- they are substantial, have the sound of liquid sloshing around in them when you shake them (they fellow who gave them to me said oil filled), are rated for very low inductance, but large current capacity.

Can anyone enlighten me as to their purpose?

dave
Attached Images
File Type: gif oil-choke-label.gif (21.3 KB, 157 views)
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 7th October 2005, 09:15 PM   #2
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
And a picture of the choke...
Attached Images
File Type: jpg mystery-chokes.jpg (40.6 KB, 166 views)
  Reply With Quote
Old 7th October 2005, 09:27 PM   #3
SY is offline SY  United States
diyAudio Moderator
 
SY's Avatar
 
Join Date: Oct 2002
Location: Chicagoland
Blog Entries: 1
If these are old, that's probably PCB inside...

If I were to guess, these were made for filament or heater supplies.
__________________
"The way to deal with superstition is not to be polite to it, but to tackle it with all arms, and so rout it, cripple it, and make it forever infamous and ridiculous."- H. L. Mencken
  Reply With Quote
Old 8th October 2005, 12:25 AM   #4
diyAudio Member
 
Sch3mat1c's Avatar
 
Join Date: Jan 2003
Location: Milwaukee, WI
Send a message via ICQ to Sch3mat1c Send a message via AIM to Sch3mat1c
Nice stuff.

Considering the apparent age it probably does use PCBs but as long as it stays sealed it's safe (even if it doesn't, its reactivity is debatable so there ).

0.11H is around the critical value for say 300V 1A, so that makes enough sense. No good for less than that critical value, but...

It may've also been used at lower voltage for consequently wider current range, but I don't know anything tubed that would need that kind of power. Could also be early transistor era, but I doubt they would've needed parameters like that with 50s and 60s germanium junk as it was.

Tim
__________________
Seven Transistor Labs
Projects and Resources
  Reply With Quote
Old 8th October 2005, 05:29 AM   #5
dhaen is offline dhaen  Europe
diyAudio Moderator Emeritus
 
dhaen's Avatar
 
Join Date: Jun 2002
Location: U.K.
Add 12uF in parallel for a 120 Hz resonator. Connect in series with your DC DHT heaters to reduce hum.

NB Check my math, it's always suspect
  Reply With Quote
Old 12th October 2005, 01:37 AM   #6
JesseG is offline JesseG  Canada
diyAudio Member
 
JesseG's Avatar
 
Join Date: Jul 2005
Location: Mid coast of British Columbia
Hey Dave:

I tracked down those chokes - they are filled with PCB. They came from the transmitting stage of the Coastguard radio station here in Alert Bay. Westinghouse 20,000 watt HF (240 Khz) transmitter ca. 1940. Removed July 1967.

Same with the trafor and chokes I have - these came from the audio amplifier section (shame this was lost) - it drove about 18 speakers around the site on 75V step-up-down trafors on the speakers (remember the highschool PA system).

Now, you just have to figure out what to use them for.

Cheers
__________________
"If we crashed our cars as often as we crashed our computers, we'd all be dead!"
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Plate chokes & Power chokes JC951t Tubes / Valves 3 19th October 2006 03:18 PM
Two chokes in one pot? vax9000 Tubes / Valves 2 7th June 2006 09:42 AM
Chokes 4 everyone! Circlotron Parts 15 9th May 2005 07:51 PM
Chokes in PSU diyman Solid State 6 20th February 2004 05:13 PM
Rf Chokes - Sos b_online Parts 0 14th May 2003 11:27 PM


New To Site? Need Help?

All times are GMT. The time now is 11:43 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2