Controller IC for Revox B77 and PR99
MAIN micro controller PROM IC for all Revox B77 and PR99
Our Part No. 1.177.317-51
Fits most models B77 and PR99 .
Some early models (very few) use the large Studer PROM IC - see the controller IC for the A700. The parts are not interchangeable.
Non OEM. The part is burned by us on a brand new IC chip and is fully warranted. It includes a new plug-in IC socket as some some boards don't have these and the chip is soldered in - we think it's better to have it as a plug-in IC.
This IC often becomes faulty as a result of capacitor degradation with age. A recap of PSU motors and tape transport modules should be done before replacing this IC. One of our electronic kits is highly recommended.
PLEASE NOTE VERY IMPORTANT. IC's, semiconductors and optics once purchased and delivered are non returnable. Replacing an IC or semiconductor into a dubious or possibly faulty machine can blow it as other problems may be present. All semiconductors are new and tested before they leave our facility. You are urged to do a full recap of your machine and then test all PSU voltages before troubleshooting and replacing any IC. I repeat - no returns on semiconductors or complaints / cases opened 'it doesnt work', 'not as described' etc. Apologies if this seems harsh but all items in good faith leave our workshop in good working order and simply replacing semiconductors may just not be the solution your own subjective fault funding has concluded. I am happy to discuss your symptoms and try to help you diagnose problems before you purchase. Please avail yourself of this offer.