FOR SALE: CUSTOMIZED TUBE Preamplifier - "Ultimately Optimized as a High Grade MM Phono Stage Preamp
Item #649197232Info: CUSTOMIZED TUBE Preamplifier - "Ultimately Optimized as a High Grade MM Phono Stage Preamp
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||9 - Excellent (?)
Aug 06, 17 5:56am (PST)
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“Ultimately Optimized as a High Grade MM Phono Stage Preamp”
DYNACO PAS CUSTOM PREAMP SPECIFICATIONS
Serial Number: 08162014-5
This unit is a completely rebuilt preamp inside a PAS cabinet.
1.) Power Supply: The power supply incorporates an oversize power transformer with a line noise suppressor installed on the primary side. There has been an internal fuse/holder installed to protect the transformer – original PAS’s did not have a fuse! Over 3000 uF of capacitors are used to provide clean B+. Two 12 volt regulators, and over 20,000 uF’s capacitance in this supply provide very clean DC to all 12AX7 heaters.
2.) All internal wiring has been neatly meticulously replaced with Silver/Teflon wire and coax where required. A greatly improved star grounding system has been implemented to provide obvious results – this thing is SUPER QUIET.
3.) Output / Input RCA jacks have been replaced with good quality gold plated connectors mounted on a new jack board.
4.) The volume and balance pots have both been replaced with high end ALPS pots.
5.) The input selector switch has been replaced with a good quality 4 position 2 pole ceramic switch. It has been rewired to a simple configuration to minimize signal paths and input noise.
6.) Tape input and output jacks, and wiring have been preserved to provide this functionality. 3 line level Auxiliary input jacks are provided. And 1 Moving Magnet (MM) Phono input is provided.
7.) The magnetic phono stage has been fully rebuilt and is EXTREMELY QUIET, and sounds EXCELLENT.
8.) Most resistors have been replaced with a 1% low noise film type. All signal capacitors have been replaced with a mix of WIMA, MINIPRINT, ITT and SIEMENS types.
9.) The original Bass and Treble tone controls, and the Stereo/Mono Mode Selector switch, have all been disabled – again to shorten and clean the signal path. There is a Mono/Stereo slide switch called “-Selector Sw-“ and its function is obvious when operated.
10.) A 3 wire grounded power cord has been installed to provide safe and clean noise free operation.
11.) The main portion of the chassis and bottom have been recently chrome plated and they look like new. The face plate and aluminum knobs are original. Improved large rubber feet have been installed.
12.) In our opinion this is the Tidiest and Best Sounding PAS we have ever listened with. And did we mention this thing is SUPER QUIET!!
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