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Francis Pettifer

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About Francis Pettifer

  • Birthday 28/08/1957

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  1. The ah600 features 2 300 watt power amps in one case. Each amp will deliver 300watts rms into a 4 ohm load.. Under no circumstances should the 2 amplifier outputs be connected together. Each output is designed to drive an individual speaker enclosure. It is quite feasible for each output to easily drive 2 8 ohm cabinets wired in parallel, hence 4 ohms to each channel. Therefore you can drive up to 4! 8 ohm speakers in this way. If you activate the built in electronic crossover, the left hand Chanel drives the low frequency cabs, and the right hand channel drives the higher frequency cabs. Do this, and your on stage sound will be fantastic. I've owned one since 1993, and they are a totally brilliant amp, particularly if fronted by the gp12smx per amp.
  2. Hi all. Some of you may remember tracking me down a while ago. I was the guy in the waistcoat that was featured in Bassist Magazine. Now here's the problem. My amp was made in 1993, and after 22 years, one of the power amp channels has given up the ghost. It started humming at a gig, not a huge volume, and no signal from my bass was getting amplified. I used the amp in bi amp mode, driving a 1x18 and a 4x10+ a 4x5 bright box. The impedance that each power amp sees is 4ohms...the 1x18 was custom built for me by trace as a 500watt rms 4 ohm cab. I know a bit about electronics, and have 'dabbled' with some successes and luckily only a few failures during the las 40 years. The faulty Chanel seemed to be giving about -5volts ish DC. I have limited test gear...a multimeter, and figured that maybe the mosfets had died. The psu is giving +-75 volts, and the other power amp channel works perfectly. I've replaced the mosfets, and the driver transistors, all readily available from RS online, but I can't get the amp to work...ice checked the diodes with my meter, and they all seem to be fine. If I substitute the j50 mosfets in various combinations with the originals the measured output voltage differs...ive had as much as -60volts now, but this can be reduced by swapping the mosfets again....what's going on? Please help. Regards Fran Pettifer
  3. Look, ok, I admit it, like the long lost prodigal son, I have been found, and am most grateful for all of your searching, and as a mark of respect to you all, I am only too happy to answer ANY questions that you may have concerning my past 16 or so years, indeed, any other topics may also be considered. I can't, however, promise I'll respond every day, or that any of your prayers will be answered (as in Bruce Almighty) that would be silly, but I will do my best to communicate as frequently as possible. 'Keep the faith'
  4. Ah, yes, I see..hmph. I am graciously honoured, and somewhat bemused at the comments that you have all made. Yes, indeed, it's no longer a mystery, I admit it, its me.. I was hard up at the time, and was desperate for a new set of strings which bassist magazine gave as a reward for writing in. Id boiled my old Elites in water and vinagar and they were sh..ed. They did cock up the article and forgot to include my name, but after a couple of faxes they got it right, and I was duly rewarded with a couple of sets (5 string) of Rotosound strings. Trace Elliot loved the article and gave me some goodies including a T shirt and a guitar strap that I still use. The bass was indeed a Bass Collection SB315, and I had replaced the pickups with the famous BassLines actiives...They sounded FAT. I still use the 1x18 bottom cab (it was custom made for me by Trace, and has been 100% reliable. (I have literally used it for hundreds of gigs). I still use the 4x5 bright box, but have replaced the 2x10 with a Trace 4x10. I still gig regularly in and around the Coventry/Midlands areas, and yes, I am, [b]Fran Pettifer[/b].....(the waistcoat, sadly, was stolen at a gig), I've sold the Bass Collection, and now use a Yamaha TRB5p.
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