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Old 9th February 2008, 04:35 PM   #11
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Don't forget that you need output taps at 4, 8, and 16 ohms in order to supply the cathode feedback to the output tubes. I'm not sure if that can be accomplished with Lundahl transformers. I'm not saying that they cannot be used this way, just something to check into.
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Old 22nd February 2008, 06:00 PM   #12
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Default OK, so that idea is out

After reviewing the schematic for a VT100 MKIII, I can see the OPT and other proprietary parts are going to be hard to source.

So now I'm considering a modified Williamson design:

http://home.att.net/~chimeraone/tube...illiamson.html


Any thoughts?
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Old 22nd February 2008, 11:02 PM   #13
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Default Re: OK, so that idea is out

Quote:
Originally posted by petera77
After reviewing the schematic for a VT100 MKIII, I can see the OPT and other proprietary parts are going to be hard to source.

So now I'm considering a modified Williamson design:

http://home.att.net/~chimeraone/tube...illiamson.html


Any thoughts?

Unless you use absolutely top notch O/P trafos in a Williamson amp, the phase shifts will KILL you.

Phase shifts are MUCH less problematic in a Mullard style circuit.
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