2. amps-preamps
  3. 190498-138624

Audiophile grade passive impedance buffer

Preamp balanced output impedance at 20Hz measured by Stereophile as 6.9k ohms! No problem into 90k ohm balanced input impedance of old amp, but new amp inputs only 10k ohms balanced. If an audiophile grade passive impedance buffer exists on the market, I haven't seen it. Will I need to run single-ended and thereby abandon a fully-balanced setup? Or does one of my components simply need to go?

hickamore
hickamore OP
671 posts
 

Guess I just need tips on where to find a suitable impedance buffer. My own search turned up nothing promising.

BTW, Mfr says "output impedance is primarily resistive. This means it should behave consistently across different frequencies." Believe this is so with amp as well but have not yet verified. Just don't want to lose deep bass to an impedance mismatch.

 

armstrod
613 posts
 

Here's a possibility:  Modwright Analog Bridge

 

czarivey
5,946 posts
 

Musical Fidelity has one of those tube buffers

hickamore OP
671 posts
 

@armstrod What a fabulous piece of gear! I would buy that thing simply on principle. Now awaiting a dealer response. Do you personally use it?

@czarivey Heard rumors of that one but could not track down a specimen. 

invalid
1,200 posts
 

Space tech labs has several balanced tube buffers.

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