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Re: my rotel preamp wont turn on what is the power...
It's more likely to be a fuse that's gone. If so it could be caused by faulty device on the heat sink. The only device that converts power is a Transformer. You can test this by simply putting a Volt meter on it's terminals. They are not hard to fit, however they have to be replaced by the same thing or one approved by Rotel.
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IF THE FUSE YOU ARE PLACING IS THE SAME TYPE AS THE ORIGINAL YOUR AMP HAS A PROBLEM WHAT YOU MUST DO IS TO SLIGHTY INCREASE FUSE BY 100 MAMPS PER TIME IF IT IS IN THE TRANSFORMER CIRCUIT YOU CAN INCRESE IT BY 2 AMP MAX IF IT IS IN THE MOSFETS CIRCUIT YOU CAN INCRESE IT BY A MAXIMUM OF 500MAMP LET ME KNOW THE RESULTS
Before we throw in the towel, turn it off and exercise every control a lot of times throughout its range, particularly the Tape Selectors. Sometimes oxides will develop on seldom used controls and their 'normally closed' contacts will not pass a signal.
Power switches generally have to replaced by the same thing, due to safety standards.
I don't know if any of these firms stock Rotel parts, but you can give them a try. They are all online electronic spare part stockists: CPC, SEME, Willow Vale.
Two more appear to be trade only: Charles Hyde and Son, and Wizard.
Failing them contact Rotel, they might have the part or suggest the place to go.
Based on your post, the pre-amp is doing its job. What might be the mismatch would be the powered speaker system plugged into the output of the Rotel. Depending on what the "powered speaker system" is, it might be that it is a low impedance such as those used in computers whereas the Rotel requires high impedance to be connected to its output. What could be tried is to connect a regular amp or receiver to the Rotel.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.