Tube Amp for Green Mountain Audio Callisto


i'm considering switching to a tube amp to drive my GMA Callisto speakers and hoping to get recommendations from folks that have done so. What tube amps would pair well with the callistos?

The speakers have the following specs:
Impedance: 4.8 Ohms, +/- 0.75 Ohms from 100Hz to 20kHz
Sensitivity: 90dB

What would be the minimum power i can get by with? i don't listen at ear bleeding levels... maybe 80 db 12 feet from the speakers.

thanks in advance for any suggestions!

-Scott
128x128srosenberg

Showing 1 response by srosenberg

thanks for all the excellent responses.

using a radio shack SPL meter, i turned the music on as loud as i care to listen with the following results:

~88-90db from the listening position (the big peaks sometimes hit 95), which correllated to ~90-92db 1m from the driver (big peaks hitting 97).

on paper it would seem that i could get by with around 8 watts, as that would equate to 99db.

i also called Roy - he so amicable - and he confirmed that with as little as 15 watts, the callistos will sound great.

i was thinking an atma-sphere S-30 would not have enough juice to get my speakers singing, looks like i was wrong. i'll also look into the 300B, Jolida and Cary options.

thanks for all the suggestions!