In Reply to: direct couple posted by GTCharlie on January 23, 2012 at 15:14:05:
Yes, direct coupled should be the way to go. Either stacked PS or like the DRD.
I heard different story, some says direct coupled need a stiff power supply with regulator. Even with 300B low powered, like the DRD, the B+ voltage will be the sum of driver + output. Now we are talking about 500+V. Regardless of big triode in DRD, almost impossible!! This is pretty tuffy to have a regulated power supply for DRD.
Another approach by talking to several tube builders and they prefer 50 or 70% more AC voltage on the secondary than the acutal B+ voltage and very low DCR secondary winding as well. Then drop the voltage from the first cap for actual needs feeding the low DCR & high inductance choke along with big bank of reservoir for proper filtering. This is the only way making a PS for a direct couple SE amplifier like the DRD. What do you think?
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Follow Ups
- Regulated power supply? - Tube Tourist 23:42:39 01/23/12 (2)
- RE: Regulated power supply? - drlowmu 09:01:23 01/25/12 (1)
- I make my own AC to solve that problem - bwb 11:12:38 01/27/12 (0)