Carlsbro GLX 80 Limited Edition - Crackling on clean channel

[RevDarkman]

Hi folks

New here and have arrived after making three days of searches and reading other forums, and decided this one was by far the most useful, and seems to be friendly!

I have had this amp since it was brand new in 1995, has been gigged but hasn't been used that much in teh last 10 years or so.

Prior to an early retirement of gigging (soon to get back into it!) this amp would sometimes sound very crackly on the clean channel, but only when you hit the guitar strings hard, no matter what the volume level was at. When strumming gently with your thumb for instance, no break up of the really clean sound.

I did post the question on the old Carlsbro foum, and the engineer there said somethign along the lines of ..." there's a (part!) on the input side that was borderline only just up for the job and these have been known to fail.

That's all I can remember - and I never got round to sorting it as i didn't really use it.

I'm now a little more 'pressurised' to get it working - ie haven't got the money to spend on an amp, but can wield a soldering iron (laptops!) but don't have the amp knowledge.

So can anyone guide me in the right direction to find this faulty component, source it and replace it?

I'm happy to pay a modest fee via paypal for the advice that gets my red baby singing again!

Thanks

PS here's a pic...

[revenge89]

Hi, i have a carlsbro glx, mine is 150c but i suppose glx80 and 150 are very similar, my ampli had the same problem, but i resolved it changing the first opamp tl072 (maybe it was damaged..) and adding 2 zener diodes 7V5 between pin 6 and 7 on IC2 opamp, where is the VOLUME potentiometer, (put them in anti-series mode) ( negative input and output) to limit the input signal, it worked and now no more crack sound. You can try..