You can read all about these on the tubes4hifi website.(photo I used is not actual photo but they look basically the same) This is a 125 watt monoblock amp that uses four output tubes in a parallel push pull output circuit. The amp is built on a 10 inch by 12 inch 16 gauge brushed stainless steel chassis and uses a modified VTA Mark III driver circuit. The recommended tube complement is 4 X KT88, 6550, KT90, KT100 or KT120 output tubes, 2 X 12AU7 or 12BH7 driver tubes, and a 5AR4/GZ34 tube rectifier or a Weber WZ68 Copper cap solid state rectifier. On the front face is an on/off switch and three bias test pins. One test pin is used in biasing the two left output tubes and one test pin is used in biasing the two right output tubes. The bottom center test pin is a ground pin. The rear face contains one RCA input jack, a fuse holder, an IEC AC connector, and a pair of output binding posts. The output binding posts may be set up for 4, 8 or 16 ohm speakers. The amp has a switch which allows operation in pentode/ultralinear mode (125 watts) or triode mode (65 watts). The triode/ultralinear switch may be used while the amp is running. NOTE - The amp may also be operated with just TWO OUTPUT TUBES - one left side output tube and one right side output tube. The amp just needs to be rebiased when switching to two output tube mode. With just two output tubes, the amp will have about 65 watts available in pentode ultralinear mode and about 35 watts in triode mode. Power output (4 X KT88) 125 watts from 17 Hz to 32 KHz at less than 1% THD in ultralinear - 65 watts in triode
Power output (2 X KT88) 65 watts from 17 Hz to 34 KHz at less than 1% THD in ultralinear - 35 watts in triode IMD .................................. < .38% (19 Khz and 20 Khz) at rated power Frequency response ....... 10 Hz to 35 KHz +/- .1 dB at 1 watt Power bandwidth ............ 17 Hz to 37 KHz +/- .3 dB at 125 watts Sensitivity ....................... 1 volt in for 125 watts out Feedback .........................10 dB Damping factor ................14 Input impedance .............. 270,000 ohms Hum and noise ................ > 95 dB below 125 watt output The M-125 does not invert phase Dimensions - 10.0" wide X 12.0" deep X 7.10" high
Weight (each) - 34 pounds
These sell for 2600 wired, I'm selling for 2200 PLUS 8 output tubes (6550's), 2 rectifier tubes (5AR4's), and 4 output/phase tubes (5963's). So they are ready to go! Owned for about 6 months or so. Reason for selling is I upgraded. I also have solid state rectifiers (weber) if interested. Shipping cost depends on location, need to be insured, these are heavy, local pickup preferred. May decide to ship separately to avoid damage, or may ship freight.
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