Laney VC30 – Clean channel distorted Repair – Keld AMpworks, Newark, Worksop

Laney VC30 Clean channel distorted

My customer brought this Laney VC30 from Worksop to my Newark workshop complaining that the clean channel distorted. It’s a pity, because he’d kept it in pristine condition!

Two other attempts had been made at repairing this fault. One by Laney themselves, and one by a local electronic engineer. Both had fixed the problem temporarily but it had re-appeared. Upon testing, the clean channel was very weak and distorted.

For this reason I took a different tack. At least one of the previous repairs had simply been replacing V1. This is a logical choice since V1A deals with the clean channel, but the valve tested as working and I suspected that the clean channel distorting problem was probably with an invisible dry joint in the valve socket. I reflowed all the joints on the socket and the problem dis-appeared. Of course I’ve guaranteed my work and in the unlikely event that the problem re-appears again I’ll take the amp straight back in.

I also noticed that the output valves were very poorly matched. This wasn’t causing the problem clean channel distorted problem, but it was worth rectifying to alleviate future issues.

I noticed some interesting design changes in the VC30 – compared to other Laney VC amps that I’ve repaired. Most interestingly, Laney have swapped their traditional spring reverb for a digital reverb based around the SPIN ASM reverb chip that they’ve used in other recent ranges, such as the Cub.

If you have a Laney VC30 or a clean channel distorted repair, please get in touch.

Carlsbro Repair – Cobra 80

Carlsbro Repair

Carlsbro Repair – Cobra 80

The owner of this Carlsbro repair complained of an intermittent crackling and occasional dropout. The fault was found to be within the power supply – a not uncommon source of trouble in bass amp repairs.

One of the pins on the bridge rectifier had developed a hairline crack through the pin. It was mounted to the rear panel, and when the panel flexed, the power connection arced, creating the described noises.

This repair was easily finished within the diagnostic period. When I find a quick fix for customer’s amps I always perform a routine ‘mini service’ to ensure the customer gets their money’s worth.

They’re not bad little amps these old Carlsbro Cobras – I gigged for many years in a jazz band using a Cobra 45!

If you have a Carlsbro Repair job that needs doing please, get in touch.