Repairs Book Closed Till September


I have reluctantly taken the decision to close my repairs book until September 2017. I am doing this for a few reasons:

  • I have a few repair jobs backed up at the moment that I need to clear before I take in any more and a couple of on site PAT testing jobs to do.
  • I am considering moving into building valve amplifiers and will investigate some other electronic business ideas I have and I need to commit some time to this and build a few prototypes.
  • I have a more advanced valve tester half built that needs to be finished.
  • I plan to reorganise my stock of parts and build some better storage shelving.
  • I have to help my father move house and get his existing house in Sheffield ready for sale.

I am sorry if my customers are stuck with faulty gear but I think it is better to do this than promise to fix stuff then let folks down.

I will still be checking my email (the best way to contact me with enquiries in the mean time) if you have any questions or enquiries.

Bye for now!
Dan Davenport.


Marshall 1960A Cab Jack Socket Fault – Fixed

I have had a Marshall 1960A Lead 4×12 cabinet in with problems.


Only two out of the four drivers were working on mono 4Ω mode and one of the four was making bad noises. This cab relies on the switch contacts on the two jack sockets to connect the two pairs of drivers in series (16Ω) or parallel (4Ω) depending on which socket is used. The switch contacts on the original sockets are nickel silver or tin plated and can’t stand much current without burning out. This is what happened in this case. The arcing had heated the contact enough to melt the plastic body.


To fix the fault I replaced both switch jacks with gold plated Neutrik / Rean NYS2152G replacements. They fit perfectly and should last a bit longer than the originals. I also sprayed the centre Mono / Stereo switch with contact cleaner. There was also a loose spade connector on one driver which I pinched up with pliers to solve the bad noises.

IMG_1530 IMG_1526

If your amp is tired, temperamental, sick, dying or dead you have come to the right place!


LaLuna Technology is an electronic repair workshop based in Hadfield, UK. It is a one man band owned and run by myself, Dan Davenport. I specialize in musician’s amplification repairs, valve (tube) guitar amplifiers, mixing desks and PA. I am near Glossop, twelve miles from the centre of Manchester and twenty six miles over the moors from Sheffield.

32 Station Road, Hadfield, Glossop. SK13 1BQ
Ph:07761394965 or 01457 597018

Common Services

Guitar amplifier repairs and valve replacement

Loss of power, valve rattle and snaps crackles and pops are all possible symptoms of tired tubes. A heavily used amp can easily wear out tubes in 6 months. Bring it in for a valve test.

Valve amp mods

Mixing Desk Servicing

I have had a lot of success with Dynacord Powermate 600, Powermate 1000 and Powermate 1600 MK1 & MK2 mixer/amps popular with pub singers and vocal groups. These are the older and heavier ones but there are still a lot of them out on the road. The common fault with these is one blown power amp which lights the protection LED. Fixing this fault on a pm1000 will cost £170 including parts (new set of power transistors on blown channel), labour and six month warranty. A pm600 would be £115. It may be something simpler which would of course cost you less.

Power amp repair

Some PA rack mount amps can be fixed economically, depends what’s gone and make/model.

Noisy control pot clean and lube or replacement

Audio cable repair

Faulty input jack replacement

Speaker testing and replacement

PAT safety testing

Get your amps (especially vintage ones) safety tested if you don’t want to risk going to rock heaven in the footsteps of Keith Relf of the Yardbirds who died of electrocution while playing through an badly earthed guitar amp. Valve amps can use HT supplies in excess of 500 Volts DC which is more than enough to stop your heart! A lot of venues ask to see proof of PAT testing before they let you play. PAT test on a guitar amp, mains cable and multiway extension inc. certificate would cost you £10.

Home audio visual gear repairs