Amplifier Repairs FAQ

What type of amplifiers do we fix ?
What is the most common fault ?
Why does the fuse blow ?
How long does it take ?
Can all amps be repaired?
Do I have to book it in for repair?
Do you use genuine parts ?
Can I telephone for advice ?

www.proaudioservice.co.uk



What Type of Amplifiers do we fix ?
We repair all types of amplifier but specialise in PA, Guitar, Bass and Power amps. However we do repair HiFi amps. We are as happy repairing a valve amp as a modern class d switch mode amp. As long as we can source the parts we can repair the unit.

What is the most common fault ?
Commonly the output devices have blown, often short circuit in power amps. These may be bipolar transistors or mosfets or increasingly chip amplifiers. Next to this we have power supply faults ( capacitors and transformers thyristors ) and then bad connections ( jacks, xlr , outputs etc. ) Intermittant faults with bad connections can often take time to fix but with heating and cooling we can usually get to the bottom of the problem.

Why does the fuse blow ?
The fuse in the amplifier will blow if there is too much current being drawn. This is usually caused by a fault. Do Not increase the fuse size just to see if it still blows. This will result in even more damage. Sometimes the wrong fuse is put in ( slow blow / fast blow ) but more often than not there is a short circuit somewhere. This can normally be repaired .

How long does it take ?
Generally the turn around is 1 -2 weeks including tracing the fault, locating parts and ordering, fitting and testing. We can sometimes turn around a repair in a few days if the parts are delivered next day or are in stock.

Can all amps be repaired?
Probably all amps can be fixed, but we need to draw the line at spending more than the cost of the amp. The cost of parts varies from a few pence to up to tens of pounds per component. Power transistors may be £8 -12 each but in the event that you need to replace more than a couple then the cost will rise. The good news is that we can tell you the price to repair the unit included in our bench charge of £35. For £35 we open up the unit, trace the fault and estimate the cost. You can then decide if it is worth repairing.

Do I have to book it in for repair?
We prefer that if you are going to bring in an amplifier then we know its coming. We will give you a job ticket and rough idea of when it will be looked at. Please do not post items without letting us know its coming . telephone 01283 215561 to book it in.

Do you use genuine parts ?
Yes we do. When you bring in your expensive Mesa Boogie amp or Marshall stack we will use genuine parts from the manufacturer. We will match all transistors with graded devices where specified and guarantee the quality of the replacement parts. Where we cannot get genuine parts we will only use parts by major brand names.

Can I telephone for advice ?
Yes certainly. We try to be informative and give a good service. However we can get busy at times so please bear this in mind. tel 01283 215561 or email info@proaudioservice.co.uk