In Reply to: RE: "you generate waste heat, but the tube heaters will not fail prematurely." posted by 1973shovel on May 20, 2012 at 07:38:46:
It's easy enough to bring the B+ rail voltage down. Replace the 5AR4 with a "potato masher" 5R4. The 1st filter cap. can't exceed 20 μF. So, replace Dyna's crappy choke with something better, like a Hammond 159T, and pile the capacitance up after the choke.
At a 250 mA. B+ draw, the forward drop in a 5R4 is a whopping 67 V. ;>)
Eli D.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: "you generate waste heat, but the tube heaters will not fail prematurely." - Eli Duttman 19:22:28 05/20/12 (5)
- RE: "The 1st filter cap. can't exceed 20 mF" - 1973shovel 15:08:39 05/21/12 (4)
- RE: "The 1st filter cap. can't exceed 20 mF" - Eli Duttman 17:29:50 05/21/12 (3)
- Potato Masher - 1973shovel 05:18:05 05/22/12 (2)
- RE: Potato Masher - Eli Duttman 18:49:35 05/22/12 (1)
- RE: Potato Masher - 1973shovel 06:36:05 05/23/12 (0)