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Registered Member #3832
Joined: Thu Apr 14 2011, 11:57PM
Location: Downtown Chicago, IL
Posts: 37
Hi all. Recently picked up a plate and filament transformer. I know it's rated at 1160VCT, then there are 6.3V and 5V filament leads.
I'm really confused as to how the Primary is set up. There are 4 Primary terminals, labeled as follows, and in this order going across:
(P1F) (P2F) (P1S) (P2S)
I cannot for the life of me figure our what the hell those mean, all I know is that when I stuck an old analog multimeter across the 580-0-580 when I used the P2 terminals as the primary, My needle went off the chart. When I did the same on the P1 terminals as the primary, the multimeter arced over and quite literally blew up. Could have been random, but I would say that P1 terminals give out a higher voltage???
I was hoping one was for the filament windings and the other was for the B+.
Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
I think the S and F indicate the Primary windings Start and Finish. There are two primary windings, so you can wire them in parallel (P1S tied to P2S, and P1F tied to P2F) for 120V input, or in series (P1F to P2S) for 240V input.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
1. Take care that you don't starting thinking of your 580-0-580 transformer as an 1160 V one that happens to have a centre tap. The insulation to Earth at the ends of the winding is not rated for 1160 V.
2. Measuring the unloaded output voltage of the windings will give a misleadingly high indication. Transformers of this kind were designed to work into a full-wave thermionic diode rectifier followed by various permutations of smoothing capacitor and hefty iron-cored LF choke, after which came the actual application requiring HV DC. .
Registered Member #3832
Joined: Thu Apr 14 2011, 11:57PM
Location: Downtown Chicago, IL
Posts: 37
Proud Mary wrote ...
1. Take care that you don't starting thinking of your 580-0-580 transformer as an 1160 V one that happens to have a centre tap. The insulation to Earth at the ends of the winding is not rated for 1160 V.
2. Measuring the unloaded output voltage of the windings will give a misleadingly high indication. Transformers of this kind were designed to work into a full-wave thermionic diode rectifier followed by various permutations of smoothing capacitor and hefty iron-cored LF choke, after which came the actual application requiring HV DC. .
The transformer is labeled 1160VCT with Insulation rated for RMS1750V. The actual terminals are labeled 580-0-580.
I have an 18H choke which I'm going to use negative side, and a string of 50uF 500V lytics to assist filtering.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Well take care, Steve! Insulation does not improve with keeping. A voltage rating made 50 years ago should not be relied upon now, and you should test the inter-winding and winding-to-core insulation with a Megger, or similar high voltage insulation tester.
There's a basic blurb on transformer testing here:
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Transformer Labeling Help!
Insulation does not improve with keeping. A voltage rating made 50 years ago should not be relied upon now, and you should test the inter-winding and winding-to-core insulation with a Megger, or similar high voltage insulation tester. 