Hi everyone, Ed asked me to post this so I am, this is the phono stage I run and like.
DIY Tube Phonostage Class at the Randall Museum by Ed Yang
Some of you may know that once a year I teach a DIY tube gear class. This time I’m offering a phonostage / phono preamps class. You will lean about RIAA equalization circuits and build one of my designs known as The Randall Phono.
I have subjected Randall Phono to a number of shootouts / comparison and it has always come out on top. It has a big tone with superb midrange, sparkling treble and solid extended bass. The sound stage is big without being bloated. Imaging is spot on where you can easily pin point the location of performers and instruments in space. At $196.00 for the class, around $350.00 in parts and 8 class sessions you take home a phonostage that is truly high end.
The phonostage you will build is the “passive” type based on the 6SL7 family of tubes, 5V4 rectifier with selectable cartridge loading. This is a medium gain phonostage so you can use it straight with 2mv and greater cartridge. If you use a low output moving coil cartridge (LOMC) you will need to use a step-up transformer (SUT). With a good SUT this phonostage have enough gain to accommodate LOMC as low as 0.14mv. The output impedance is around 30K so it should be able to drive most preamps or integrated amps.
This class is recommended for intermediate or advanced students. If you have taken any of the previous Randall Tube Audio DIY classes or have experience soldering, you are good to go. Even if you have never soldered but have good dexterity, then this class could be ok for you but contact me first. The class is limited to 10 students. This will be the only time I’ll offer the class so don’t wait till the last minute to register.
Class Announcement / Info:
http://www.randallmuseum.org/Flyers/Winter2011FlyerWeb.pdf Go to page 12 class #18824
Winter Class registration:
http://sfrecpark.org/Rec-ClassActivities.aspx I think you can enter the class number on the search function. The class may not show up on the reg site until 12/18 but do check.
Museum Member registration:
December 11, 10 a.m.General registration:
December 18, 10 a.m.
First meeting 12:30 PM Jan 8th 2011 in the Randall Room at the Randall Museum
If you have any questions email me Ed Yang at:
Randallphono@yahoo.com
