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 Post subject: SX-43 Power Transformer
PostPosted: Nov Sun 15, 2020 2:58 pm 
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Joined: May Wed 20, 2020 1:33 am
Posts: 316
Location: Rockford, IL
I have wanted to replace the transformer in my SX-43 for a while now.

The set requires: 117V primary, 530V/100mA, 5.2VAC/2A, 6.3VAC/4.0A

I can get a Hammond for this at a good price: http://www.hammondmfg.com/263.htm

I thought about a 270FX that is 550VCT and is a little better rated. The problem is the additional 20 volts: is it a problem and can the circuit eat it up and not worry?

I really want to avoid HV zener diode and/or resistor bleed-off solutions. I am not a fan of this.


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 Post subject: Re: SX-43 Power Transformer
PostPosted: Nov Sun 15, 2020 3:18 pm 
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Joined: Jun Sun 19, 2011 2:31 pm
Posts: 7784
The 550V rated transformer will be fine, as long as it physically fits the slight voltage difference won't have any impact.

Rodger WQ9E


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 Post subject: Re: SX-43 Power Transformer
PostPosted: Nov Sun 15, 2020 4:01 pm 
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Joined: Jan Tue 07, 2020 1:41 am
Posts: 3737
Location: Fenton, MI 48430
The extra 20 volts is not an issue. High line voltage can supply an extra 20 volts with the stock transformer. If you want to lower the HV, use a bucking transformer.

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