Helo everyone my name is Jon and I'm in the UK,iam having a little trouble with my amp and I would really appreciate some advice.iv had many Rockford fosgate amps from the late 90s to when I lost interest in around 2006, I currently have two punch 200xi DSM,1 punch 500.2 and this power 250.2 and all have been stored away properly in the shed untill recently when I got the audio bug again,a little info on this 250.2 it was blown in 2006 due to me dropping it down to 2ohm mono,I recently replaced the factory components to 3205's and correct gate resistors,put in 540's and 9540's for the outputs,checked every semiconductor and resistor,biased current both chanels to 4mA ,worked great sounded great used it on front components in my car,ran it hard and for a long time no problem until I bridged it 4 ohm mono to run a small 800w 4ohm sub and the amp went pop after about 5 mins with moderate volume,the sub was fine and the coil is fine,it blew 1 left side 3205' and the outputs on the right Chanel were shorted and the left side voltage regulator was reading strange numbers,and I suspect some source resistors as when I manually warm them up there values are all over the place they read fine cold,but around 0.04 to ,0.09 when heated up.the gate resistors read fine,i have a solder station but no scope,I do not have much money to spend on a hobby but if a cheap scope comes up I may treat myself, I have read Perry's online tutorial and when I get a laptop with windows and set up pay Pal I will buy his full tutorial as i have got a soft spot for Rockford fosgate ever since the 1990s when I was a teenager I have always loved there products and quality, there the only amps I will ever own or buy and I would like to learn more about them to buy and repair my own if need be in the future,if anyone has a spare moment can you advise me on other things to check with this amp,and could someone please recommend a substitute for my source resistors they are 0.03 ohm and a cannot find them anywhere or a equilivent,iam preparing an order at mouser for the semi conductors,please find attached photo of the board and the resistors they are 4band, black,orange,silver,gold.any help would be greatly appreciated
Kind regards
Jon
Kind regards
Jon
