Transformer Ratings

[W1RKW]

I have the following transformers:

Stancor 52C046
Chicago Transformer TR-1040

I don't know what the secondary ratiings are.  A Google search turned up zilch.  Anyone have any info on these?

I did an open circuit voltage test and found both of the secondaries put out ~5KV.  The thing the bothers me is one of them says the secondary should be in the 'hood of 2.5KV.  I'm not sure what the secondary is supposed be on the other.

[Pete, WA2CWA]

I have the following transformers:

Stancor 52C046
Chicago Transformer TR-1040

I don't know what the secondary ratiings are.  A Google search turned up zilch.  Anyone have any info on these?

I did an open circuit voltage test and found both of the secondaries put out ~5KV.  The thing the bothers me is one of them says the secondary should be in the 'hood of 2.5KV.  I'm not sure what the secondary is supposed be on the other.

A quick Google search turned up this mail message from 1999. The 52C046 is a Hallicrafters part number used in the BC-610. See second paragraph below:

"Mon, 15 Nov 1999 07:13:21 -0600
Iin the bill of materials for the SCR-399 by Hallicrafters, the modulation transformer is listed as: Transformer, modulation; prim. 16,000 ohms c.t. ; sec.8330 ohms c.t.@250 ma. source is Stancor; Signal Corps part no. 2Z9634.3 Hallicrafters part no. 55C028.

Plate transformer: Transformer, power; prim. 117v tapped to provide 4000 or 5000 V.C.T. @ 500 ma. mfr. Stancor; Signal Corps prt no,2Z9612.1, Hallicrafters part no. 52C046: Another H.V. transformer for the 450 v supply is listed"


And another from 1998:
"bill of materials for the SCR-399,  of which the BC-610E is the basic tx.  FWIW  this is it---Plate tx.  Stancor mfg.  117v pri.  5 or 4 kv ct sec at 500 ma.  sig corps p/n 2Z9612.1  Hallicrafters p/n  52C046. the matching choke  is:  Stancor mfg. Hallicrafters p/n  56C062"

[Pete, WA2CWA]

Chicago Transformer TR-1040 was replacement part number for Link Radio Equipment Part number 11862. I have no additional info on this item.

[W1RKW]

Hi Pete,
Interesting on the Stancor transformer.  The taps are stamped 2000 and 2500V.  It puts out 5KV and the rating you found says 5KV as well.  Glad I didn't fire it up in some equipment without testing it first. 

Thanks for the info. 

[Don, W2DL]

But - the full secondary should measure 5000V if it is marked 2500, they are using either side of CT voltages (which is close to what the supply really puts out in use) and the 5 kv rating is the entire secondary w/o considering the CT. Grounding the CT will give the usual 2500V+/- or so out of the full wave 2 rectifier supply as normally used in the '610 - a bridge rectifier would theoretically  give the full 5000V if needed , but the CT insulation on this xfmr will break down in bridge service (it then runs at 1/2 the HV output rather than the normal ground or close to it potential), ruining the xfmr. Been there, done that (with some other xfmrs)

73
Don, W2DL

[W1RKW]

Hi Don,
Yeah, that makes sense now.  I guess what I wasn't getting was the overall way the transformer was marked. The secondary doesn't have any markings at all indicating what the secondary voltages are.  Instead there are three connections on the primary marked as follows: 0, 2000, and 2500.  I guess these numbers refer to the secondary voltage referenced to the secondary center tap. 

[k4kyv]

Yes, that sounds like a BC-610 plate xfmr.  It runs 2500 vdc in cw mode, and 2000 volts in AM mode.  The primary is tapped down for CW operation, so that the total step-up is higher.  It is  designed for full wave CT rectifier circuit.  I wouldn't trust the midtap to be insulated well enough to allow for fullwave bridge operation. 

I use one in my HF-300 rig modulator power supply @ 2500v, to replace the pre-WW2 UTC that shorted out internally.  It is within 100v of the original, and if anything, the regulation may be slightly better.  I think it is good for at least 500 ma, to accomodate the 610's rf final, modulator, plus bleeder current.

They come in two varieties; an open frame version with cast iron end bells, and a hermetically sealed cube filled with tar.

[W1RKW]

Hi Don,
Thanks for the info.   Don't know much about the BC610 but that explains why the primary markings are configured the way they are.   That's good to know. 

I have the hermetically sealed cube filled with tar version.  What a hernia maker this baby is. I won't have to worry about my rack being top heavy if I stick this in the bottom.

Bob

[W2VW]

The later sealed and T368 versions of this transformer WILL work with a full wave bridge.
 

[WA1GFZ]

I used a pair of bc610E transformers in my old 4-1000A linear. Cap input you will get about 3200 to 3300 volts under load on the high tap. I hung a pair across a 240 volt line for better regulation but 1 will give you 1500 watts  of peak rf out. I think the T368 transformer has a bit higher voltage.

[W2VW]

The T-3 is 6336 VCT with a 110 primary.
Later BC-610 was about 5720 (can't remember the last 2 numbers) or 4800 VCT depending on the hookup of the primary which had dual windings for 110/220.
I've seen (6) T-3 xfmrs with secondarys paralleled and primaries across 110 worth of the mains using both sides. Makes a nice cool supply.