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In Reply to: RE: Some new info here and if I'm reading this right posted by Michael Samra on May 08, 2016 at 13:54:52
The new source you're quoting is tough to follow. His description of the function of the plate chokes seems to be incorrect. Additionally, not all Mac amp designs used them. The later versions of the MC225 had none and other models used simple solenoid chokes of equal value.
The stated reason for not adding the cathode winding voltage to that of the anode winding also seems wrong. Both windings contribute to the output and both need to be considered.
The description of the connection of the bifilar windings doesn't make sense and is inconsistent with the diagram in Mac user manuals. I haven't reverse engineered any Mac OPTs so I can't verify from direct experience who might be correct but the Mac diagram makes sense.
The source also mentions that a differential probe is necessary to properly measure a-k and g1-k voltages. A properly insulated battery operated voltmeter is inherently "differential" so I have no idea why a special differential probe would required. A scope isn't necessary to make a gain measurement.
I take it from all this that you've made no measurements from a-k and g1-k as previously discussed, yes? Regardless, I'm going to re-measure one of my Macs and report back. Think an MC40 is representative enough?
Follow Ups:
Steve
Sometimes it's easier to talk to the individual than derive things from a 2 paragraph post.Many of us don't always translate our actual thoughts to paper in the best way as we leave a lot of things out that we take for granted that the reader nay already know..I many times leave thoughts out and I have to go back and reedit..
A friend you get for nothing,an enemy has to be bought
Steve
The choke explanation would be between the lines a bit he didn't say all Mac amps used them.We were talking about the Mc30 when he chimed in..It seems as those that wind the Mac opt trafos seem to have a different perspective from those that don't wind the transformers including Doc Hoyer.
Give him a call when you get a chance and let him explain it..I see from a point of a view where this could have a 2 to 1 gain when you look at from the aspect of being similar to cathadyne PS but since there are other variables at play,you may not be able to do that..I don't know who is right or wrong at this point.
A friend you get for nothing,an enemy has to be bought
Edits: 05/08/16
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