In Reply to: Any reason I have not seen a fixed bias phono stage??? posted by TomWh on December 9, 2014 at 08:03:04:
The issue probably has to do with the need to provide an extremely clean DC voltage. A manufacturer would be hard pressed to justify the cost of the additional PS compared to a simple cathode bypass cap. For DIY, it's possible to do, but then a coupling cap has to be inserted to protect the cartridge. You might consider the 5755 for the first stage. It's a zero bias triode, so it doesn't require either a bypass cap (the cathode is grounded) or a coupling cap. I haven't heard this tube yet, but it's the next thing I want to try for a phono pre.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Any reason I have not seen a fixed bias phono stage??? - Triode_Kingdom 09:40:27 12/09/14 (3)
- RE: Any reason I have not seen a fixed bias phono stage??? - TomWh 11:24:52 12/09/14 (2)
- RE: Any reason I have not seen a fixed bias phono stage??? - Eli Duttman 12:41:14 12/09/14 (1)
- RE: Any reason I have not seen a fixed bias phono stage??? - Michael Samra 13:34:43 12/09/14 (0)