2. amps-preamps
  3. 1140406847

Preamp impedance mismatch with McCormack DNA2

I recently purchased a McCormack DNA-2 with an SMC Rev.A mod. The amp currently has a 100K input impedance, however I am sending it back to Steve for some additional mods including the Jenson balanced transformer upgrade, which would change the input impedance to 10K. I am currently running direct out of my Reolution Audio Opus 21 cd player, but would really like to add a tube preamp. I am finding that alot of tube preamps are typically ( on paper ) not suited for driving a lower input impedance. However, what is on paper and what is reality are often two different scenarios. I would appreciate some suggestions on some balanced tube preamps that may work well with this amplifier. I don't live in an area where there are dealers so trying several at home is not possible. At least with some suggestions it will help narrow my search and the amount of traveling I will have to do. Thank you for all the help.

Darrin
rhythmace4218

Showing 1 response by clio09

clio09
3,364 posts
 
A Joule Electra LA-100 MkIII has an output impedance of 600 ohms and according to Jud Barber will drive an amp with as low as an 8k input impedance rating. They show up used here for less than $2k, otherwise near $4k new.

Space Tech Labs is a good option as well. I have been looking into them for their passive preamp and Albert is more than willing to customize one for me based on my equipment specs.
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