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In Reply to: RE: The lower wattage have toroidal posted by deafbykhorns on December 04, 2016 at 18:35:14
The 60W lighting transformers I've purchased do not have toroidal output transformers.
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Buy Chinese. Bury freedom.
Edits: 12/05/16Follow Ups:
So how would you modify them? No wraps of wire to unwind.
I don't modify the output transformers. Early models that I purchased when I was designing my SETs would output a 12V square wave. I reduce it to 10V with a resistor on each side of the filament. The resistors provide an easy start for both the lighting transformer and the tubes. Newer models of these are different for some reason. The output is higher than 12V, and the wave shape isn't so square. It's not clear to me at this time whether I can still use them. That's why I'm looking into the standard DC-output switchers as a source of high-frequency AC. They're regulated, they're adjustable, they're filtered (the DC for the oscillator), and they operate at higher frequencies right out of the box. There's also very little difference in price between the two types, and the DC supplies can be used in the case they're designed for (no need to add the large external filter capacitor). All things considered, I think this approach holds more promise going forward.
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Buy Chinese. Bury freedom.
I think from what I heard this morning listening to the halo's I am inclined in that direction myself. I will know for sure after I build the left channel with switcher units today and do some side by side listening.
Vinnie, I want to stress that the listening tests are for naught if the switching frequency is only around 32 kHz. That can mix with audio signals or their harmonics and create audible intermodulation products.
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Buy Chinese. Bury freedom.
I am waiting to hear back from "deaf" about a method for kicking that up to about 65 Khz, will that be high enough? I plan to give that a try and see what happens. Actually, I just got the left channel working with all DC about an hour ago and have been doing some more listening and the differences don't seem as great when I can switch back and forth between them in a few seconds with the volume knobs. I can't quite decide if the "edginess" in the Halo channel might not just be a cleaner sound. Obviously I have a lot of tweaking and listening to do before I ever decide which way to go. I also just discovered that the 26 in the halo channel is still on dc, so I have to switch that over to ac for a true comparison. Still running a hybrid at the moment.
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