loading
reading
writing
saving
searching
Single Quad 405-2Macmod (Steve McCormack/ Mod Squad) Monoblock for par - $275 (salinas)
QR Code Link to This Post
This is a rare Macmod monoblock – the product that made Steve Mccormack famous and let to the creation of the Mod Squad.
Steve Mccormack took a Quad 405 stereo amp, and made the ultimate version of these current dumping amp – by removing a lot of the protection and limiting circuitry and upgrading the components.
Quoting from quad405 (dot) com: “MAC MOD 405 The respected audio designer Steve McCormack (USA) soon realized that the basic concept of the Quad 405 ("Current-Dumping") was great, but the idea was destroyed by crummy parts and a drastic protection circuitry. In consequence he offered a modification kit for the 405. The ultimate Mac Mod were mono amps.
The modification contained the following changes : •Current Limiting removed •Improved IC fitted (LM 318) •Faster Drivers ( Motorola MJE 15031 ) •Faster Output Devices ( Motorola 2N3773 ) •Improved Resistors (metal-film 1% by Resista Mk3 or Corning RN-60 ) •Improved Capacitors (Wonder Caps, Wima, dipped mica) •Improved Wiring (Audioquest) and Plugs (Tiffany)
The Mac Mod 405 surpasses the original 405 in every respect : It was a great sounding amp which could compete with the most advanced high end amps in these days. Harry Pearson of the "Absolute Sound" magazine wrote an enthusiastic review about it. I still regard it a pity that Quad-UK did not overtake the Mac Mod as standard, because the improved 405 is an exceptional amplifier. The only caveat about the complete Mac Mod is, that the ultimate version (= mono amps) has too much power for the delicate ESL-57 (protection circuitry mandatory !), though power output is quite right for the ESL-63.”