If you are brave you could try the NYAL OTL3 that is for sale now.
I bought Stax F83's years ago (in the eighties) and tried many many amps before settling on this one. Head and shoulders above everything else I tried, including Counterpoint, Audio Research, and several solid state amps.
The tubes for these are no longer available, but the seller is including a new spare set, and they seem to last forever. Of course, the Stax's have an even higher impedance that the Logans, so it may not be quite such a dramatic difference.
I bought Stax F83's years ago (in the eighties) and tried many many amps before settling on this one. Head and shoulders above everything else I tried, including Counterpoint, Audio Research, and several solid state amps.
The tubes for these are no longer available, but the seller is including a new spare set, and they seem to last forever. Of course, the Stax's have an even higher impedance that the Logans, so it may not be quite such a dramatic difference.