It's a bad idea because it isn't done right most of the time, and Marshall even abandoned this. it has to be designed so the cap always has a charge path (load placed on the HV line) or else there can be quite a few seconds before the bias voltage kicks in. It will also change with load. In the Marshall designs they seemed to do all the wrong things, and there is indeed a bit of delay before the bias voltage is fully generated.robert wrote:Hi Joey,
what's the reason you think that the use of a capacitive divider for the generation of the bias voltage is a bad idea?
If it's done right (e.g. the use of a high enough AC- working voltage of the capacitor!) it will work flawlessly in a HT bridge rectification circuit, IMO.
BTW: but I prefer a separate bias winding also (more flexibility)
Regards
Robert
It is much better to just use a separate tap for the bias supply. It doesn't need to be rated for much.
I feel all of these matters that I listed would Make all this companies power transformers a more desirable option, so people don't feel stuck having to use them for one thing only. There is quite a big market for high gainers/more complex amplifiers, as well as a market that would like the flexibility to be able to use big bottles to their full potential with out the fear of placing too high of a load on the HT.
I think a general PT, one that doesn't necessarily need international primaries, but with these other things addressed would be a big seller. There have been numerous people who have asked me if any of the classic tone PT models would work for their project other places, and I had to tell people no, or very conditionally, because they simply don't look to meet the current demands of anything else besides a Plexi, or 2203/4
