Recent content by LowBonito

Hi, I am in Germany and have some experience in refurbishing SVT-II non pro‘s. I am using Papst 8830 N fans for replacement. One thing I am missing is a schematic of the early power amp with part number 07-419-01. Anyone out there who can help?

Hi, according to my information the explanation is as follows: TNB = Part Number D = North America B = 1989 9 = September 0008 = Device # 0008 Regards Jurgen

Thanks you all for your inputs. I checked every site with no result. I think I'll get the newer plastic knobs.

Here is another question on knobs: These D-shaft knobs are mounted on my 1991 Ampeg SVT-II non pro. They have an aluminium cover with a dot glued on top of the plastic barrel. Can anyone tell where I can buy these?

Here is my solution:

Found it! The amp is fine. Humming has to do with the pickups. The closer I stand in front of the amp the more one can notice it.

My SVT-3 Pro (2007) has a noticeable power hum only when the EQ section is engaged. Any thoughts on where to start my research? Thanks for helping on this. BTW: I reduced the fan noise dramatically by adding four little 12V blowers (two each in series and the couple in parallel to the main...

I had a similar problem with my Fusion 550 just a week ago. (No warranty anymore) A 115RBH cabinet in Bi-Amp mode connected via original GK 4-pole Speakon cable to my Fusion 550 produces a terrible crackling noise in the tweeter, independent of mute on/off and independent of other settings. Full...