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In Reply to: RE: New Soul Sister pre posted by calsaint on February 20, 2017 at 15:13:45
I would suggest that you save all that iron for a different project. You could replace the CCS with the 50H chokes, that would be fun. Maybe not quite enough inductance but close, power tubes are a possibility if you want to parafeed. The 400-0-400 transformer can only work if you make it a full choke load design. However as you found, your 50H choke will not work in that position, it will be beat to death and buzz as it was most likely not designed for choke input service. The 1.9uf cap is not enough to shield it.
Unsolicited opinion: Better yet, if you want 300v @ 30mA power supply. Get a 250-0-250 transformer (a 120v to 240v step up transformer works great and cheap. Use a Full Wage Bridge with Cree Schotkys into a 50uf Atom cap 10 Henry choke 100uf Atom cap 5 henry then drop what you need to get to 300. Bin the OD3 noisemakers (Absolutely no reason to use them to power a CCS)
Follow Ups:
Thanks! It's fun experimenting.
-I can pull the chokes and rework to go with resistors in the PS I suppose. I'm guessing that'd be the easiest fix, that or changing out the choke(s). As you said, I may need ones that are more suitable for PS filter.
-As for the transformer and the 5u4g it's what I had around from an old build. I have another option to use a couple of much smaller transformers and go dual. It'd be a lot of re-work but it's all good it's not like I have a deadline.
-Steve
For a "quick fix", you could insert an additional filter stage, CR after the rectifier and before L1. This way use the R to drop voltage instead of making L1 act as choke input.C could be, say, 47uF, that way by the time L1 sees anything the ripple will be quite low already.
Edits: 02/21/17
Have you tried inserting a less potent rectifier and see if that works, as is. Like a 5Y3GT? Just as an experiment...
not yet - I can certainly give that a shot
thanks for the suggestion.
-Steve
Seems like a bit of voltage/current overkill for a pre-amp. Didn't want to use a 5Y3GT (or derivative, like the 6106)?
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