2. amps-preamps
  3. 1118983827

Specs to look for when matching tube pre to SS amp

I would like to not make a costly mistake and learn how one determines (at least from a specifications standpoint) on how to match equipment. I have a deHavilland UltraVerve tube preamp and am looking for a new/used SS amp. The Dehavilland specs are:

Input signal: 2v RMS maximum
freq respon : 10Hz to 80kHz
noise : <80db
Max output : 8v RMS
Gain : up to 10db

The pre only uses single ended inputs and I want to match to a SS amp. My monitors are Focus Audio FS688 (85db) so I am looking at amps in the 200+ wpc range. Someone told me that I should go with an amp that has no more than @ 1.5 input sensitivity. Some of the amps that I'm looking at, GamuT and the Classe CA 2200 are in that range. I would like to consider an amp like the Blue Circle BC26MK2 as I have read it sounds somewhat like a tube amp and matches well with the Focus speakers, but it's input sensitivity rating is 4.48 to 200W. Would this create a mismatch? I believe the Pass Labs .2 series is also well over 1.5 . I do not often listen at loud volume levels. Is there more than amp input sensitivity to consider when matching to a tube preamp? I can not demo a lot of equipment, but would appreciate your suggestions. Thank you!
classical1

Showing 1 response by 1markr

1markr
592 posts
 
The output impedance of the DeHavilland UltraVerve is 600 ohms. They recommend amps that have a minimum of a 10kohm input impedance.

I am currently deciding between keeping a Plinius SA-102 (47kohm input impedance) or a McCormack DNA-500 (10kohm input impedance). I own both, and both are excellent matches with the UltraVerve. It's going to come down to my preferences, but these are two of the best SS amps that I have personally owned.
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