This is a Quad 44 preamplifier Repair and update service 

The repair and update service includes the following:

1. Trouble shooting circuit boards replace damaged components with equivalent modern parts. 

2. Make pre amplifier operational and perform update service:

>power supply capacitors and output relay timing capacitor will be replaced with high quality electrolytic capacitors - 

>All op amp ICs will be replaced with Burr Brown SoundPlus opa134 audio quality op amp ICs with sockets on main board - 4 ICs

>All op amp ICs will be replaced with Burr Brown SoundPlus opa134audio quality op amp ICs with sockets on all modules - 10 ICs 

>Input rca jacks will be replaced with higher quality gold plated versions.

Further module and/or main board upgrades are at the request of the customer 

Additional modification requests are welcome!!!!