Eastern Electric M520 has a review on 6moons with the Gallo REF3s. Very nice match for little investment. I bought mine new on audiogon from Bill (Eastern Electric distributer) for less than 1600.00. Great amp with switchable feedback levels, pentode or UL modes switchable on the fly utilizing el34s in a class a push pull mode. I think there are 2 that are selling used for around 1000.00 right now on audiogon. I use mine with Abbys, but replaced the EF86s with E80Fs for better noise level.