We repair, overhaul and upgrade all models of C-J amplifiers and preamps, some of the most common are listed below. If you do not see your particular item listed, please be assured that we do work on it. Please feel free to contact us if you have any specific request.


Preamps:

Many of the early production C-J preamps have developed component breakdowns over the years. Filament rectifiers, various caps and resistors overheat and change value, and the early series coupling caps lose value (this causes a  familiar problem: muddy bass, no real high-end and a blurred midrange)
Models Affected:
EARLY PREMIER SERIES:2, 3, 6,7
(later production 6,7 had much better caps)
PV-1,PV2, PV-3,PV4,PV-5, PV-7, PV-10, PV-11.
Usual  repair on these involves replacement of defective parts and a upgrade of caps.
Due to the level of performance expected of C-J equipment we advise using premium  caps as replacement.
Usual repair / upgrade cost range will be between $250-450.00, depending on model. Some extensive mods are more, please contact us if you have any questions.
 If a simple repair without cap upgrade is desired the cost should be in the range of 150.00 - 200.00
 

Power amps:

MV-45,75,100:
These usually will have overheated resistors, degraded coupling caps, and breakdown of soldering. We have a standard repair / upgrade for these of $350.00 which includes resoldering, replacing resistors and coupling caps and cleaning  solder  rosin residue from the circuit boards.

MV-55:
Perhaps the most popular C - J amp, usual cause of problems are solder defects and burnt screen resistors. Cap replacement is usually not recommended for these models
Usual cost  of basic repair  175.00 plus major parts.

Most early production C - J power amps are supplied with a  completely inadequate power cord.  Different retrofit options are available at minimal cost and are recommended.

Premier Series:
Usually only isolated component failure, tend to be repair only due to high quality components used in this line.

Please note that we are a privately owned service company and do not perform warranty service on Conrad-Johnson products. If your C-J is under warranty please contact Conrad-Johnson directly.