VTUG Meet Sat Sept 10 1-5 Randall Museum, SF: DACS, upgrades

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Mortsnets

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WHERE:  Randall Museum, San Fran
 
WHEN:  Saturday 10 September 2011, 1:00 PM to 5:00 PM
 
WHAT:  A meeting of the Vacuum Tube Users Group, VTUG
 
WHY:  To hear D to A converters.  Chris Boettcher has a new one.
There will be others.  We will be listening to music.
 
If you have questions please email me at the address below or phone
me at 831-335-2655.
 
Daniel Norman
norman.dan@ieee.org

And here's more info from Chris (the presenter):

I auditioned the Anedio, the BelCantos, the Arcam, and a few others. All
of those were underwhelming although for the money, the Arcam seemed very
good. Then I happened upon the Music Hall 25.3 which is asynchronous USB
with a tube buffer stage if you use the unbalanced outputs. I was blown away
by it, and it is available for about $500. Best of all it is very easy to
modify it, which is what I will be discussing at the meeting. I am changing
out the opamps, and the power supply regulation and coupling caps. But even
the stock unit is really sweet. I thought that it might be an appealing
class project.