This Corda HA-1 was bought this from one of Jude's recent auctions on E-Bay to support Head-Fi for $250. This was about two months ago, so the Corda is in brand new shape - except better! Ian (Head-Fi Member) performed most of the Corda Blue mods that make this thing sound fantastically better. The mods performed are:
-Replaced first stage with OPA637 opamps
-Replaced output stage with double stacked BUF634's
-Reduced output resistors to 10 ohms
-Changed resistor for bias current on OPA637's
-Reduced gain for new chips
All in all, Ian spent about $60 on parts for these upgrades. Solder used was
very high quality Welborne Labs Silver Solder. All resisters were very high
quality Vishay/Dales. The result is an absolutely fantastic sound - the bass
is markedly improved, and there is much more openness and airyness. I wish I
didn't have to sell it, but I can't afford to keep three amps around.
Considering that $60 in upgrades were added I am only looking for SOLD shipped.
Please PM me with interest. I can email you pictures but it looks
exactly the same as stock Corda.