We modify existing circuit boards with changes in power supply caps, bypass caps,
Op-amps, coupling caps, etc. Customers have been delighted with the more open, liquid
and tube-like sound quality.
GPX mod (for 555/565 preamps) - $299, $399 for Elite version
GTX mod (for early model tuner/preamps) mod is only $299/installed, $399 for Elite
GFP-750 preamp mods are $399 basic, $599 for Elite version
MC-3 Preamp Circuit Board
Phono, line and power supplies are on board. Make no mistake! This is a "State of
the Art" sound. The MC-3 fits Adcom preamps - not tuner/preamps. Factory installation
is available. The OPS-8 listed below is usually required.
Note: Volume control not included since the excellent Noble volume control is used
in these preamps. Important Note: tone controls and filters are eliminated.
add $125 for Line Stage/Power Supply (includes soft-recovery rectifier mods to outboard
power supply, Silmic II® caps and alternate bypass caps in line stage)
add $75 extra for Phono stage modifications using Silmic II® caps
OPS-4B, OPS-8 Outboard Power Supply
For your B&K preamps and others. OPS-4B features one +30VDC and one -30VDC output.
OPS-8 Features dual + 30VDC outputs for use with MC-3. Each has a large toroid transformer
and 40,000ufd of very high quality capacitors. Signature versions of this power supply
have Schottky rectifiers.
This power supply is large enough for a small power amplifier!!!!!!!!