Corona virus update 01/04/2020

Our repair shop remains open for business at this time 


A&J Audio has its own  in-house repair workshop, with full  test and diagnostic facilities , we also carry a large stock of semiconductors and spares. Specializing in the repair of PA amplifiers, Guitar amplifiers, Solid state or Valve.


MORDAUNT SHORT 309w, 409w, Aviano 9, Aviano 7, Alumni 9.


We have a lot of experience with the Mordaunt short 309w, 409w, Aviano 9, Aviano 7, Alumni 9 active sub woofers, and have repaired many of these units, even for customers as far away as the Netherlands, it seems that these units are no longer being made, however we will continue to offer a repair service for these models.

As an Independent 'Out of Warranty' Repair Centre we are able to cover any make and model of amplifier, subject to parts and availability,. A&J Audio will ensure your repair bill to be affordable where many repair centres would deem the equipment a write off.

After repair we carry out PAT testing as standard , using the latest calibrated test equipment supplied by Megger Ltd.


Unlike some of our competitors we have a contact address and phone number - beware of internet repair companies with no contact details other than an  0845 number what are they trying to hide ?  


The following examples show our capability as well as offering some guidance to other engineers attempting to repair the equipment featured, this is a small snap shot of some repairs we have carried out, feel free to email us with your repair enquiry.  

Some examples of repair work 

KRAMER TP210 XGA over cat 5 transmitter

MS 339 Allumni repair

C Audio RA 3001 1250w Amplifier repair

Mordaunt Short 309W. 150w Active powered sub woofer repair

Peavey CS800X  600w Amplifier repair

JBL EON POWER 15 Speakers repair

Citronic Conquest V12 1200 w amplifier

Citronic Po 8 Mixer repair

Mordaunt Short 309W 150w Active powered sub woofer repair

Alto PS4HA  350w+60w Powered speaker repair

Biema W220 Mkk2 Amplifier repair

 Peavy Tour 700 amplifier repair 

Fender Frontman G15 repair

Mordaunt Short MS409W repair Active powered sub woofer repair

Mordaunt Short MS309W repair Active powered sub woofer repair

Gemini GX 350 Powered speaker repair

Re-tube of SVP 350 Video projector

Cloud VTX750 Amplifier repair

Orange Rocker 30 repair

Repair of Gallien Krueger 250 ML Amplifier

Repair of a Fender Blues Deville Valve guitar amplifier

Repair of a Marshall 100w Master Volume Guitar Amplifier

Repair of a Studiomaster 1200D amplifier

Repair of  ALTO TS115  TRUESONIC - Powered Speaker

Repair of Ibiza Sound 2000w amplifier

Repair of Peavey Messenger Pro Sub Bass

Marshall 100w+100w EL34 Rack Mount Amplifier

Repair of Mackie SWA 1501 Sub Bass Amplifier unit

Repair of Samson XP510i 2 channel Amplifier

Repair of a Selmer Zodiac valve 100w combo

Repair of 2 Mackie SWA 1501 Sub Amplifiers

Repair of CREST AUDIO VS1100 Tour class amplifier

Repair of Mackie Onyx Mixer

Repair of Mackie SRM 450 mk1 powered speaker

Repair and restoration of the Maltese Cross Matamp

We hope the above information has been of assistance to those attempting a repair, we add more examples all the time, a lot of work goes into this section of our site from the doing the repairs, photos and answering technical support emails, to keep this a free service we rely on the goodwill of people who benefit and learn from the information supplied.

Please show your appreciation, feel free to make a  donation no matter how small to keep this service going.




TELEPHONE (UK) 01803- 392219 

TELEPHONE (INT) +44 1803- 392219


Head Office



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