Heathkit w4-am transformer replacements - diyAudio
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Old 29th September 2012, 11:38 PM   #1
chiffre is offline chiffre  United States
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Default Heathkit w4-am transformer replacements

Hey, I want to build a Heathkit w4-am amplifier from scratch. The problem is buying one on ebay and restoring it is expansive. I know the schematics and aside from the transformers I can just buy every part. I'm no EE, and I don't know much about buying transformers. Does anyone have any suggestions on easy to find power, chock and output transformers that will work for the w4am design?

Last edited by chiffre; 30th September 2012 at 12:12 AM.
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Old 30th September 2012, 12:31 AM   #2
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Somewhat dependent on where you live ... shipping is expensive. If you're in the US, try Edcor. Their CXPP50-MS-6.6K should work nicely.
BTW, the W4-AM is a pretty straight forward Williamson design, with some of the simple to rectify short comings of that design. Check Wright's 'Improving the Williamson' (google Talbot M. Wright). Also, read: http://home.att.net/~chimeraone/tube...illiamson.html. This basically confirms Wright's findings.
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Old 30th September 2012, 04:30 PM   #3
chiffre is offline chiffre  United States
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Hey thanks, I've looked at the Hammond 274BX for the power transformer, but I wish I could find something less expensive. I also haven't found anything for the filter choke? The schematic says the filter is 160 MA 160 ohm. But that seems to be a hard item to find, is there anything that will work in its place?
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