I have some experience with similar stuff, but not a lot. I will give possible answers as I understand them below. Perhaps someone with more experience will come along later. It should not have any effect. A winding is a winding, regardless how it's hooked to whatever external circuit. Once removed, the external circuit doesn't matter. Melted enamel insulation on a winding, shorting the winding, will cause some smell and a failed transformer without any outward sign. One of the main uses of a ringdown test is to find shorted turns, since they aren't otherwise observable. The internal resistance of the winding will be a tiny bit lower, but generally not enough to tell by measurement. A shorted winding causes it to NOT ring because all the energy gets used up quickly in the shorted winding (as heat.) You may be able to rewind it. That would be an "fun" exercise. The transformer "may" be a standard part, but I doubt it. And what was sold as standard 20 or so years ago isn't likely to still be available new. The core, however, may still be available. But you already have a core. And, you would most likely need to disassemble the current one anyway to find out the number of turns per winding as well as the size of wire used. Hope this is at least some help. Sorry I can't give more definitive information. Will "A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away." -- Antoine de Saint-Exupery "The names of global variables should start with // " -- https://isocpp.org

are That was my first suspicion too, but I couldn't see anything that had obviously burned up and I still can't now. I didn't get the machine apart again after the failure soon enough to locate the smell unfortunately. similar power Yes, I think my chances are low to get it replaced. Regards Rob

Fyi..This site has a ps listed for sale. https://www.kunhardt-computer.de/kunden/kch/modul_a_l.htm I haven't worked with so can't vouch for them. Sent from my iPhone On Jan 12, 2020, at 14:46, Rob Jarratt via cctalk <cctalk at classiccmp.org<mailto:cctalk at classiccmp.org>> wrote: You may be able to rewind it. That would be an "fun" exercise. The transformer "may" be a standard part, but I doubt it. And what was sold as standard 20 or so years ago isn't likely to still be available new. The core, however, may still be available. But you already have a core. And, you would most likely need to disassemble the current one anyway to find out the number of turns per winding as well as the size of wire used. Thanks for the suggestion. I have no idea how to do this, but if I get desperate it may be my only possible course of action. Regards Rob

s?n 2020-01-12 klockan 21:10 +0000 skrev Rob Jarratt via cctalk: The transformer is basically only intended to provide AC at a specific voltage while preventing surges and noise from the utility to create havoc. What voltage is it specified to provide ? If so, can it be replaced with maybe a new AC to AC device ?

According to the Technical Description the NE555 is arranged to oscillate at 100KHz, and I did indeed measure that frequency, when it oscillated. Regards Rob