FS: Xfmrs (#1)

multi-volti · 7th May 2008, 07:33 AM

Housecleaning and credit card bill beckons!

Heathkit 54-950, made by the former Midwest Transformer in Illinois (EIA code 549). I don't know who absorbed them.

Standard Heath dual primary 120-240, 50/60 Hz
Secondary #1: Center-tapped HV, odd specs - HW Rectifier, 405 VDC no load, 285 VDC @ 80 mADC across the whole winding. half-winding is spec'ed with a load on the 2nd secondary.

Secondary #2: 14.5 VAC 1A

Really rough microfiche blueprint, part 1:
http://www.uptowngallery.org/Murray/.../54-950_1.html
part 2:
http://www.uptowngallery.org/Murray/.../54-950_2.html

pic#1: http://www.uptowngallery.org/Murray/54-950/54-950_1.jpg
pic#2: http://www.uptowngallery.org/Murray/54-950/54-950_2.jpg

2# net weight each. You can see the dimensions in the dwg, or ask me.

-------------------------------------
Here is a claim I cannot prove:

I spoke to an engineer at V&F Transformer, also in Illinois, another Heath supplier, (EIA code 60) way back when, and had a conversation about HW vs FWB rectification. He claimed that due to the DC flux on the core w/ HWR, a transformer is derated with a HWR, and I could nearly double the current with a FWB. It's tempting to believe this, but I can't substantiate it. I don't have loads handy to test this, but might try light bulbs.

I have a lot of these, but have to look. I know where one carton of them are.

They are unused, new old stock from the late 80's.

Some have light surface rust due to unheated warehouse storage, Guaranteed no immersion! Guaranteed functional. I have no idea how quiet they are, but note 2 requires varnish or 'Permafil' to prevent buzz. Permafil was apparently a black epoxy-like stuff.

$6 each plus shipping. I should follow up with how many will fit in a flat rate Priority Mail box.

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7th May 2008, 07:33 AM	#1
multi-volti diyAudio Member Join Date: May 2005 Location: Michigan	FS: Xfmrs (#1) Housecleaning and credit card bill beckons! Heathkit 54-950, made by the former Midwest Transformer in Illinois (EIA code 549). I don't know who absorbed them. Standard Heath dual primary 120-240, 50/60 Hz Secondary #1: Center-tapped HV, odd specs - HW Rectifier, 405 VDC no load, 285 VDC @ 80 mADC across the whole winding. half-winding is spec'ed with a load on the 2nd secondary. Secondary #2: 14.5 VAC 1A Really rough microfiche blueprint, part 1: http://www.uptowngallery.org/Murray/.../54-950_1.html part 2: http://www.uptowngallery.org/Murray/.../54-950_2.html pic#1: http://www.uptowngallery.org/Murray/54-950/54-950_1.jpg pic#2: http://www.uptowngallery.org/Murray/54-950/54-950_2.jpg 2# net weight each. You can see the dimensions in the dwg, or ask me. ------------------------------------- Here is a claim I cannot prove: I spoke to an engineer at V&F Transformer, also in Illinois, another Heath supplier, (EIA code 60) way back when, and had a conversation about HW vs FWB rectification. He claimed that due to the DC flux on the core w/ HWR, a transformer is derated with a HWR, and I could nearly double the current with a FWB. It's tempting to believe this, but I can't substantiate it. I don't have loads handy to test this, but might try light bulbs. I have a lot of these, but have to look. I know where one carton of them are. They are unused, new old stock from the late 80's. Some have light surface rust due to unheated warehouse storage, Guaranteed no immersion! Guaranteed functional. I have no idea how quiet they are, but note 2 requires varnish or 'Permafil' to prevent buzz. Permafil was apparently a black epoxy-like stuff. $6 each plus shipping. I should follow up with how many will fit in a flat rate Priority Mail box. __________________ Murray