Specs for T16C27 choke

[wa2ujx]

Can Any one help me identify the specifications for a Thordarson choke #T16C27. I measured the winding resistance (69 OHMS) and inductance (12 HY). I need know the insulation and current specs. Thanks Carl WA2UJX

[John K5PRO]

I found a T16C07 in an ancient catalog but not your number. Sorry.

[KE6DF]

I have a bunch of old catalogs and can't find it either.

Perhaps double check the part number?

They can be hard to read some times.

[wa2ujx]

Thordarson Power Choke: There is no tag like most of the chokes I have. The model is stamped on the lower portion of one of the end bells in small print. The Manufacturer name is stamped on the top of the same end bell. Physically, It looks like other chokes in the 500 mA range. I'll just  use it in 1/2Amp application and tune for smoke. Thanks for the replies. Carl WA2UJX

[Detroit47]

Carl
I found your choke in my 1937 Thordarson catalog. I'm attaching a PDF of that page. Looks like a smoothing choke at 12 hy @ 3000 vdc @ 500 ma.

73 John N8QPC

[wa2ujx]

Thank You John N8QPC You answered the question!. I had no idea it was that old (pre WWII) . I printed the catalog page with the info on this choke. I will have to use it in the negative trans CT return because the insulating rating is way too low for my 4.5KVDC supply application.  73 Carl WA2UJX 

[The Slab Bacon]

Thank You John N8QPC You answered the question!. I had no idea it was that old (pre WWII) . I printed the catalog page with the info on this choke. I will have to use it in the negative trans CT return because the insulating rating is way too low for my 4.5KVDC supply application.  73 Carl WA2UJX 

Carl,
       you would still be better to put it in the positive lead and set it up on insulators. Putting it in the negative lead would subject the transformer center tap to the full AC ripple voltage. This could cause the transformer insulation to break down and crap out the transformer.  I learned the hard way!!

[KA2DZT]

Thank You John N8QPC You answered the question!. I had no idea it was that old (pre WWII) . I printed the catalog page with the info on this choke. I will have to use it in the negative trans CT return because the insulating rating is way too low for my 4.5KVDC supply application.  73 Carl WA2UJX 

Carl,  I wouldn't use that choke anywhere near a 5KV supply.  The 3KV insulation rating isn't high enough, even in the negative lead.  Insulating the choke from ground is another bad idea, too dangerous.  The outside frame of the choke could become and probably will become hot with high voltage.

Find a better choke, one designed for 5KV supplies.

Find one from an out-of-service TV or commercial radio xmtr.  They're around,  I have a number of them that I bought on ebay.

Chicago made high voltage chokes, good for about 4KV-4.5KV.  The R-105, R-65, R-67 can handle that voltage.  10hy@500ma, 6hy@500ma, 6hy@700ma.  They have a 9KV RMS TEST VOLTAGE rating, all good for a little less than half the 9KV.

Fred, KA2DZT