Chicago Modulation transformer 55c164 250 watt

[N4DKD]

I picked up a new in the box Chicago modulation transformer at a swap meet. I have seen these around for years. Any idea what they went in?  What could it be used for?   

Chicago Modulation transformer 55c164. Grade 1 Class A

Primary is 21000  ohm

Secondary is  8000 ohm  at 250 ma

Freq resp 150 ~3000 + - 2 DB
 250 watt

Test volts 7000


I measured the ratio as 1:1:25

Thanks

Brian

[W2PFY]

sounds very much like a BC-610 transformer. Short of seeing a picture, that is my best guess having more than average experience with 2 BC-610's. But then again, what do I know??

[N3DRB The Derb]

pictures are worth 1000 words. lets see it!

[N4DKD]

OK here is a picture .

[WZ1M]

55C164 looks like another Hallicrafters part number.
Regards,
Gary...WZ1M

[w4bfs]

yessir ... another 'blue plate' special ...thig ...73 ...John

[K9PNP]

Must be another manufacturer's parts number, like was said earlier.  Tried to cross-reference it in all the Chicago Transformer references I have access to and nothing shows up close; not even close to the number format.  Sure looks like a Hallicrafters-type number.

73, Mitch

[N4DKD]

Thanks for all effort. It is a nice piece .  I'll find a project for it .


Brian

N4DKD

[k4kyv]

Or it might be good trading material for someone who has a BC-610 with a crapped out modulation transformer.

I once had one of those transformers myself.  Don't  remember what I did with it, but it always amazed me that such a small transformer could replace the big one they used in the E model.

[KL7OF]

I use that same transformer in my Tesla 360...813s x 813s  ...It works very well....The 250 watt rating doesn't seem to apply...Positive peaks in excess of 140% are possible with the configuration I currently use...I'm always looking for another if you don't need it...