Headphone Heights

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RE: Tube amp suggestions for Grado RS2e

Posted by neolith on March 13, 2018 at 17:50:41:
The RA-1 made my SR-60's sound very good. However it is just a CMOY amp and probably could be made for under $30. I calculated the gain is 13.5 db. Of course, you wouldn't have the very nice box or the great Grado service. I did replace mine with an Objective O2 with no regrets.
As far as using a tube amp, I think there is a problem. The Grado's are low impedance (32 ohm) and most tube amps have a relatively high output impedance which means there is a mismatch. A OTL amp can lower the impedance of the amp but then there is a possibility of frying the transformer if the headphone become unattached. Another choice might be to use a "hybrid" amp with a op-amp output buffer.