Well, there's http://audioheritage.org/intro.htm to look at, though I don't see much about transformers.
I have an old Peerless catalog. S-256-Q is 40 watts rating, primary 5000 ohms CT, secondary taps for 16, 12, 8, 4 and 2 ohms. Max DC in primary is 120 mA balanced, 12 mA unbal.
S-258 isn't in here, sorry. I THINK it is the same except with UL taps at 25%, or 1250 ohms.
Hey-Hey!!!, I have the listing for the 256. 20-20 Plus series. I can't find a listing for the 258 anywhere. I saw one go on eBay and have been trying to track it down since.
I think it is a pair of 1250 CT windings, which can be paralleled, or series connection for 5k with what would now be 50% taps.
Until I find out what the 258 is, I will probably have to take down a 256 so I can wind up some custom OPT with taps where I want. 50% is not all that useful for what I hae in mind these days. regards, Douglas
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