At 1950 it will be an expensive modification, specifically when you think about that the difference in retail cost between the Zero.334 and the discontinued No.331 is definitely only 1000.Madrigal states that the twó cyanate-ester voItage-gain boards account for most of this price.Besides these PCBs, the kit supplies a brand-new black-anodized Zero.331.5 nameplate for insert into the top screen; a new rear-panel stick-on label stating No.331.5, Stock Authorized Upgrade, with the serial number; a Whia slotted 2.0x40 accuracy electronic device for unlocking the XLR fittings; and coaching bed sheets with colour photographs.
Similar updates are available for the Zero.332 and No.333 amplifiers. Madrigals David Nauber described that the update kit has been designed for seller installation, a courteous sign that I overlooked as I requested a kit. ![]() Swapping VG boards and front-panel nameplates had been simple, but unscrewing and then re-screwing thé 62 Allen-head mounting bolts securing the best plate, output device addresses, heatsink dress bars, VG planks, bottom plate, and front -panel to set up the replacement unit parts was demanding, dangerous, occasionally frustrating, and eventually rewarding. Challenging The work required a clear surface, superb lighting, confident eyesight to chair the four dimensions of Allen wrenches needed, strong muscles to move the amplifier during the job, a Philips screwdriver, a 14 nut drivers, and a energy drill with a strengthened cutoff wheel and mandrel to notch a stripped bolt keeping the powder-finished bottom level plate to the framework. The teaching booklets photos were excellent, and Madrigals support staff has been very useful and nearly all reactive by telephone. Risky The Zero.331s blue electrolytic filter capacitors held a substantial charge, even after the amplifier experienced been recently unplugged from the Air conditioner mains for two weeks. ![]() For security, I protected the electrolytics with a plastic cushion while working inside the framework. Frustrating The scréwposts of the brand-new Zero.331.5 nameplate transformed out to become too brief to hold down my amplifiers onoff circuit mounting blocka standoff to maintain the turn-on circuit away from the steel nameplateso I acquired to reinstall the unique (No.331) nameplate. Investigations back again at Madrigal discovered that early-production Zero.331s (my systems serial no.: 1114) utilized the Zero.33s thicker installing block. The service division express-mailed me a slimmer piece the next day, and the problem was resolved. Rewarding For me, thé cyanate-éster VG planks sonic improvements were worth all the work. The added striper heft was heard best away when enjoying Massive Episodes Unfinished Symphony (Circa WBRX2). ![]() Mark Levinson No 334 Repair Free And OpenMore transparent mids and heights, grain-free and open up, were furthermore present. All informed, the update delivered my previous No.331 amplifier more than haIfway up to thé Zero.334s level. Nevertheless, the 331.5 kit did not transform my amplifier intó a full-bIown No.334. While certainly improved, strong synthesizer records did not growl, shock, or shock as they did when performed over a gain-matched No.334which produced a wider, deeper soundstage, greater powerful contrasts, even more headroom, and more clear midranges than did the No.331.5. Proprietors who like the sonic performance of their No.331 but would including improved bass response will benefit almost all from this upgrade.
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