2. amps-preamps
  3. 135199-111486

Impedance matching with tube amp

I have a Mccormack DNA 0.5 which has an input impedance of 100kohm. I'd like to get the Schiit Saga preamp, which has an output impedance of 180 ohms. Now, I've read about the 10:1-100:1 ratio of input:output impedance for power amps and preamps, so this wouldn't quite fit that range of ratios. Would this still be a good option, and if not, what other (<$500) tube preamp options do I have?

Thanks!
muffinhead123

Showing 2 responses by erik_squires

erik_squires
16,536 posts
 
To clarify,

If you go too low in the ratio, say 5:1 you run into the real possibility that the mismatch will cause significantly non-flat frequency response.

Sometimes the volume control settings can radically alter the frequency response in minimalist tube preamps with the wrong amp. 

You can see the effect in many Stereophile reviews like this one: 

https://www.stereophile.com/content/conrad-johnson-premier-17ls-line-stage-preamplifier-measurements


erik_squires
16,536 posts
 
The ratio is a minimum. Ideally you want a minimum of 10:1.  Anything over that is fine. 

Best,


Erik 
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