My third jump into tube amplification..mine was fully rebuilt and certified by halo fi. im using GE jan 6550 , Sylvania 12at7 and Brimar 12au7..This is the best tube roll ive come across for sweet mid, punchy bass and top decay effect...ive used these 60 watt blocks on Solid state , very sweet on Marantz 7t or model 33 pre amps..I have a big audio collection and have not found a SS pre amp the M60 design had issues with..I really could hear a bottleneck congestion effect using my PAS3X but on tube buffer phone amps to the Soundvalves VTA101 it is a very musical amp..I will note i am using them in a bi amp configuration with stereo fed subs and active networks..pretty much a killer mono block you can roll with stock 6550 to KT120 ..on board real time makes manual bias and testing instant enough.. The irons on mine barely get warm on the 6550 tubes in forced class A mode but it sounds so good supported by the VTA101 i use them in ultra linear mode for more power..Mine tested and scope plotted at 0.05 full load.. these are 2 ohm stable btw..

silk screening lettering and power switch are not to the build level the rest is..I guess i just dont like plastic switches and silk screening, much prefer engraved lettering and a billet rocker but im just being nit picky..The design is solid..the sound is higher than priced and they are very heavy American Iron..What more do you want?

Solid build construction. Beautiful appearance. Quality components. Excellent sound quality.

None.

This pair of mono amps was my first excursion into tube amps. I have thoroughly enjoyed them. They produce clean accurate sound. The company is a delight to deal with some of the best customer service I have seen in any industry.

rock solid design, attractive styling

uses EL34

built it from a kit, great instructions, beautifully packaged, great sound, solid parts, plenty of room for upgrading and tweaking if desired, SOUND AWESOME. In the $1,000 price range considering the wimpy transformers and components other manufacturers use it is a wonder the ST-70 has any competition. EL34 are great tubes but a triode switch would have made the product perfect instead of running AB ultralinear only.

Similar Products Used:

sony, NAD, hafler

The M60i scores well with me in very catagory. They are my first tube amplifiers and I have been thoroughly enjoying them. They have bettered my solid state system in their depth of sound stage and richness and depth of tone by a wide margin and make my solid state system sound 2-dimensional and anemic. The M60i's also have more detail and are full range from high frequencies to bass and amazed me by having even more bass. I mean they can take it all the way to the bottom with authority and handle dynamics equally well. They are quite handsome in black with a basic classic chrome chassis design (the chrome is a very nice touch)and have a modern face plate with blue LED bias adjustment lights. Build construction seems first rate. I can highly recommend them.