The original TAC 750 Power Supply heatsinks & regulators need to be modified and upgraded to prevent voltage fluctuations and over-heating!
And if you are hearing audible hum or strange noises in ALL of your channels, most likely your Power Supply needs to be serviced.
This FULL UPGRADE and Re-CAP will take care of your problems.
Test and adjust voltages, re-assemble and burn in for 24 hours under load and re-test prior to shipping.
Most of the TAC 750 Power Supplies that we repair have never been serviced. Some of these PSU's are over 20 years old ! By now there will be lots of AC ripple appearing on the DC output rails of your PSU, causing hum and noise. There will usually be issues with thermal shutdowns, voltage regulations problems and/or one or more power rails not working.
We replace those old, aged primary electrolytic capacitors for NEW, very high quality, low ESR units. But we also go a step further and install NEW, higher current capacity bridge rectifiers too ! Why? Because we have seen too many re-cap jobs by others quickly blow out the aged bridge rectifiers...especially when using NEW low ESR filter caps of higher capitance.
The installation of our fast recovery, higher current rated bridge rectifiers prevents these types of problems plus offers you a more RELIABLE power supply rebuild.
THE most important part of this rebuild in the heatsink and regulator mounting modifications to make your PSU run much cooler and eliminate the poor regulator electrical contact that causes voltage drops and spikes. We eliminate these problems with the GRS Power Module Upgrade installation.
This rebuild is called our FULL PSU UPGRADE AND RE-CAP.
Every PSU is burned in for 24 hours and then the perfomance specs are re-tested again.
Once you have placed an order for this service, please send in your POWER SUPPLY AND CABLE to us via insured UPS or Fed-Ex.
Be sure to DOUBLE BOX your shipment using plenty of packaging peanuts. And be sure to INSURE your shipment! GRS Systems is NOT responsible for damaged shipments and UPS and FED-EX will not pay damage claims on poorly packaged shipments!
We will let you know when we receive your PSU and we will give you an initial performance report on your PSU by email.
When your PSU is ready to ship back to you, we will notify you by email and provide you with a shipment tracking number.
We do offer a more extensive rebuild that includes ALL of the above PLUS the installation of a very low noise COOLING FAN
Please see the FULL PSU UPGRADEWITH FAN INSTALLATION listing in this section for details and pricing