PrimaLuna DiaLogue Premium HP amplifiers in black including a set of KT-120 tubes

A pair of PrimaLuna DiaLogue Premium HP amplifiers with both EL34 and KT120 tubes.  The EL34 tubes came with the amplifier and the previous owner purchased a set of KT120 tubes which are included.  Very good condition with a few minor scrapes on the sides which is why we rated them as a 7/10.  The photographs show the specifics.
PrimaLuna is known for their stellar quality in both construction and sonics.  The Premium HP amplifiers perform well above their price level.  From a recent review in The Absolute Sound...

The Premium HP amplifiers use a set of eight EL34s, arranged in two rows of four, directly in front of the transformer compartment. Two sets of four red LEDs, part of the BTI system (read on), are oriented in a square in the space created at the center of the four EL34s on the right, the other set for the quad to the left. These LEDs are numbered to match the tubes, and indicate when a tube is failing, or has failed. The system will mute itself until you replace the bad tube, then restart. In front of the EL34 complement is a row of 12AU7s, also in a slightly curved alignment as with the Premium preamp. Honestly, to my tastes, these are some extremely good-looking designs.

The EL34 is a classic pentode with five elements (cathode, anode, and three grids). First introduced in 1953, it is generally lauded for its midrange tonal properties. Its use in such classic amplifiers as Saul Marantz’s Models 5 and 9 monos and Sid Smith’s Marantz 8B stereo, and David Hafler’s Dynaco ST-70. The Conrad-Johnson MV55 and MV60 are most likely what inspired its use here. One of the first things you notice, even before powering on, is that all the tubes are PrimaLuna-branded. In conversation with Kevin I learned that these tubes are sourced from Shuguang, giving PrimaLuna the option of careful selection, and allowing them yet another layer of quality control. 

As to features, the PrimaLuna Premium HP amps in particular are second to none in my experience at, or anywhere near, their price points. As already stated, their output circuits can be switched on-the-fly between 40 watts (triode) or 70 watts (ultralinear) in stereo mode, or between 85 watts (triode) or 148 watts (ultralinear) in mono configuration, as reviewed here. Ultralinear output is about 3dB louder than triode mode—something that should be kept in mind when doing live mode-switching.

Maybe most interesting of all is that, though the HP power amp, as equipped from the factory, runs EL34s, in that same switch position you can run 6CA7s, EL34s or EL34LSs. And, if you are all right with a slight drop in output, you can even run 6L6GCs, 7581As, or KT66s. With the switch in the KT position, you may use 6550s, KT88s, KT90s, KT120s, or KT150s, should you care to! Though I had no store of other power tubes on hand to explore those options, the HP amplifiers are obviously a tube-rollers delight.

A big part of the PrimaLuna amplifier technology (and sales pitch) is something they call Adaptive AutoBias. Essentially, PrimaLuna claims it is an entirely passive process allowing tubes to run less stressfully, with greatly reduced distortion, yielding longer life and affording some large degree of safety and convenience. This circuit constantly monitors tube operation to sense when a tube is failing or has failed, at which point, it both mutes the circuit, protecting the amplifier from damage, and lights an LED indicator, notifying you of just which tube is affected. This eliminates the guesswork of swapping tubes one at a time to locate the culprit.

Though the Premium HP amplifier manual claims the Adaptive AutoBias circuit is, “an exclusive PrimaLuna feature you won’t find anywhere at any price,” PrimaLuna’s sister company Mystere, (also run by Herman) uses the same circuit. Further, Kevin Hayes’ Valve Amplification Company’s (VAC) employs his unique patented iQ Continuous Automatic Bias System throughout his entire amplifier line.

http://www.theabsolutesound.com/articles/primaluna-dialogue-premium-preamp-and-hp-stereomono-amplifiers-tube-audio-made-simple/

Here's a chance to own one of the premier tube amplifiers available in the market at a very reasonable price.  Both sets of tubes have very low hours on them.