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In Reply to: RE: According to "The History of Marshall," Michael Doyle posted by Chip647 on July 22, 2014 at 07:03:04
"I would not doubt it if this was done because Marshall got a super deal on a pallet of 95 volt transformers. "
I've been tempted to do the same in my amplifier designs, simply because isolation transformers (120V:120V) sometimes go on sale at ridiculously cheap prices. Only thing is, you'd have to get a super deal on electrolytics at the same time!
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Buy Chinese. Bury freedom.
Follow Ups:
Yes, I know you stated the amp has two PT's. And only one OPT. I thought it was interesting that the same amp (early 100 watt Leads) are noted for a few with two OPT's and one PT.
Be interesting to see if there are any 1959 prototypes with two OPT's and PT's.
From the photos in the link, looks like one PT and one OPT side-by-side. If these are both PT's, where is the OPT? I think that the tranny on the top is a choke.
Thanks!
No, there was this weird variation as well with the two small power transformers
I'm sorry, but you're mistaken. Those are the two output transformers. The hidden one under the metal shroud is the power transformer. It's the same setup as pictured in the link below. It's a well-documented amp. In my OP, in that link, look for the Version 2 (Mid-Late 1965) amp (right at the top of the page). The amp you pictured is that amp. Hands down without a doubt.
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May your tubes be lively and long-lasting. Holy be thy heater.
Ya, like Alpha Al said, it's two windings in the one PT. I'm only beginning to understand transformers in terms of design, and this threw me through a bit of a loop. Not to mention the fact that I knew nothing about bridging transformers like that. I'm still scratching my head a little, but I get the general principle.
Thanks for the awesome replies! The AA always provides!
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May your tubes be lively and long-lasting. Holy be thy heater.
He stated elsewhere it's one PT, but with two identical windings, each with it's own doubler.
Al,
Have you worked on any of these Marshall amps? I've never seen one with dual windings on the PT. At least, not one where I had to replace this PT. Are they still being wound?
Thanks, again.
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