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  1. Ok, now that I've had my Wavebourn Edelweiss-3 for a few months and it's nicely burned in it's time for me to prepare writing my review of it which I'll post here over the coming month. I'll post my impressions and experience purchasing this wonderful amp from Anatoliy Lisovskiy, who will be releasing the production series of the Edelweiss-3 power amp, an integrated amp and separate preamp over the course of this year. As I understand it the current production version of the power amp and integrated will all be EL34 though allow and pin compatible tube to be used right through to KT120, possibly even KT150. My own amp on the other hand uses WW2 vintage CV1127 radar sweep tubes. The reason I initially started looking into a lower powered amp was that 6 months ago I built my first pair of DIY speakers. A pair of shallow cabinet open back speakers which share the performance characteristics of U frame open baffles. Unfortunately the copy darTZeel NHB-108B power amp I was running at the time was far too powerful making my 101db sensitive speakers too loud for regular use so I started investigating lower powered tube amps. While looking into various solutions someone on AudioKarma pointed me in the direction of Anatoliy's Wavebourn amps and I got in touch via the Wavebourn facebook group. Over the next month or so I had an interesting discussion with Anatoliy about his amps, and their suitabillity to drive my DIY speakers (Lii Audio FAST-10S full range, Aurum Cantus G3Si ribbon, Skar Audio VX1ST bullet & Lii Audio W-15 woofer) and this led to discussions of his amps variable damping factors allowing suitabillity with a wide range of speakers. A feature which I believe may well be unique to the Wavebourn amps. Overall details of the amp are as follows: Input: 0 dB (0.775V) RCA, 50K stereo. Outputs: low ohm for 4-6 Ohm and high ohm, for 8-12 Ohm load. Power: at least 6W for <1% total harmonic distortions. Soft asymmetric saturation (inaudible clipping), negative output resistance for damping of woofers (servo-control of speakers). Bandwidth: 10 Hz-90 KHz -3 dB, from 20 Hz full power. Tubes: Raytheon VT127 (CV1127) radar sweep power tubes. 8CB11 driver/preamp tube (twin video pentode – filament powered from rectified DC for zero audible hum. VR150 / Russian SG4S voltage regulator (purple glow). VR tube and solid state MOSFET voltage regulation. The “Edelweiss” series derives it’s name from this. A beautiful flower which grows amongst hard mountain rocks. Selectable speaker damping In order to support different speaker design types such as open baffles, horns, closed and ported boxes, there’s a damping factor switch that controls output resistance of the amplifier. Position 1 is the first on the left. 1. High output resistance (like pentode output with no feedback), sometimes referred to as "Current driving mode". 2. Similar to SET with no feedback. 3. SET with some feedback. 4. Negative output resistance for active servo-damping of woofers. with a little experimentation I soon found that I prefer the negative output resistance setting, which is actually Anatoliy's own preference. Probably the least tube like sounding setting giving tight, accurate bass where other modes seem a bit looser. This is what I've continued to use since the first week I received the amp.
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