Home » Audio » Source » Practical limit to tube based phono preamps
Re: Practical limit to tube based phono preamps [message #96299 is a reply to message #96277] Mon, 23 January 2023 20:17 Go to previous message
gofar99 is currently offline  gofar99
Messages: 1778
Registered: May 2010
Location: Southern Arizona
Illuminati (4th Degree)
Hi, Good stuff. I nearly always use JJ small signal tubes. As you noted they are quiet and accurate. I like simple designs with as few stages as necessary with as few components as needed to do the job. It is possible to achieve really excellent results with non-expensive components. Careful attention to layout especially grounding is essential for a quiet build. The subject of grounding is not intuitive and requires a really good understanding of micro current voltages induced into the ground conductors and swamping noise etc from higher power stage ground currents into lower power stages. IMO the more filtering in the power supply the better. I do not like chokes for the reasons given. But I will use active filtering. Likely LR8XX or FET capacitive multipliers. 6 sections seem about typical for my builds, but I have gone as far as 9 in phono preamps. I am fanatical about getting rid of hum and noise.

Good Listening
Bruce
Previous Topic: STD 305M with SME Series 3 Arm, Which Protractor
Goto Forum:
  


Current Time: Sat Jan 28 23:15:06 CST 2023

Sponsoring Organizations

DIY Audio Projects
DIY Audio Projects
OddWatt Audio
OddWatt Audio
Pi Speakers
Pi Speakers
Prosound Shootout
Prosound Shootout
Smith & Larson Audio
Smith & Larson Audio
Tubes For Amps
TubesForAmps.com

Lone Star Audiofest