As I saw this wonderful amp only getting mentioned every now and then, so I thought I'd start a dedicated thread about Vincents KHV-1pre. First, some pictures: http://www.banovics.info/bilder/vinc...1pre_seite.jpg http://www.banovics.info/bilder/vinc...1pre_front.jpg (sorry, no pics of the opened amp yet, as I didn't have my camera with me last time) I mostly use the KHV-1 with Sennheiser HD650s nowadays, but I used AKG's K530s, K701s and Beyer's DT990s '05 in the past. The Vincent headamp features 2 pairs of RCA inputs at the back, and the source is changed via a knob on the front, as shown in the pictures. It's built as a hybrid amp with an ECC83 preamp and class A solid state output. Power--supply and amp-circuit are each located on their own PCB. The KHV-1's sound signature is one of the best, I've ever heard: Deep and powerful, but never obtrusive bass, a tube-like midrange that makes the KHV-1 sound very lively, and treble clarity without any sibilance. Without any input signal, the KHV-1 is basically noise and hum-free up to its maximum volume - which is very loud. If there's one thing, I'd like to change about the KHV-1, it would be its extremely high gain, since I'm always around 7 to 9 o'clock on the volume knob. The potentiometer however, is exactly balanced from the start. For those interested, I took some measurements of my stock KHV-1: DC-offset: 0,4-2mV Output impedance: ~11ohms Build-quality-wise, the amp seems top notch too, at least for the most part: The case is made out of 3-8mm thick aluminum panels (except for the steel backplate) but the screws are junk and strip easily (you must open the top to change the tubes) I replaced them with proper M3x10mm hex screws. The volume knob appears a bit stiff at first, since it rides on a plastic bushing - a dab of teflon grease helps here. Finally, there's some humming from the bottom mounted transformer (not through the headphones, but through the case) Some rubber o-rings between the transformer and the bottom plate make it virtually nose free. (you'd hear a very faint hum pressing your ear against the casing) Who else has a KHV-1? What are your impressions?