|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
|
|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
|
In Reply to: Anyone knows the input impedance of Lynn Olson's Amity? (NT) posted by SuperB on September 25, 2006 at 08:51:02:
Thanks Lynn! :) I'm building a second clone of the Amity I hope
to have pictures of in a few weeks.I did some research on driving it... 250 pF sounds about right.
Further, your XLR cable will add an addition 22 pF/ft (depending
on cable), plus strays in the connectors... If you are driving LONG
cables, you can see how the capacitance adds up.I'm driving it with a single-chip solid state XLR driver. The SSM2142. It has a Zout around 50 ohms and is capable of driving 1uF
of net capacitance (i.e. ALOT of cable). The SSM2142 is essentially a pair of push-pull buffer opamps with voltage feedback. It does an awesome job at driving the input transformer too. Dont be afraid to
experiment with Solid State options - especially for cable drivers and buffers. You will get drive capability and PSRR that is tough to achieve with a tube circuit that might cost $200/channel to implement.Another balanced driver to look at is the AD815. :)
-- Jim
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- net capacitance = Cin + cable - Jim Doyle 16:58:38 09/25/06 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
