HAFLER JF2000 / ROCKFORD RF2000 mods...help!!

robber222 · 17th April 2007, 12:57 AM

Hello..... new guy here. I own a Rockford RF2000 amplifier... yes, it's home audio. It's identical to a Hafler JF2000, but harder to find. I would like to upgrade/modify it. Does anyone have suggestions? I am including a link to the schematic....PDF was too large to attach. I contacted a guy that does some work on this stuff..... he suggested that I replace the NE5532 opamp chips in the input stages with Burr-Brown OPA2134 chips and that I replace the 47uf/100v caps on each output stage supply rail to the "largest caps that will physically fit the spaces". Does anyone have suggestions?? Thanks a million!!
s9.quicksharing.com/v/8943762/RF2000_schematic_1_.pdf.html

d3imlay · 17th April 2007, 08:47 AM

A local vendor bought the old Rockford stock and built up a bunch of these in the early 90's. I tested them. They either worked or they didn't and I didn't think they'd hold up. All those paralleled fets seemed like a failure waiting to happen. As I recall the opamps are all soldered in and the whole amp is one large board. If you do change opamps I'd suggest putting in sockets. Other wise, this is one amp that if it's working I'd leave it alone.

17th April 2007, 12:57 AM	#1
robber222 diyAudio Member Join Date: Apr 2007	HAFLER JF2000 / ROCKFORD RF2000 mods...help!! Hello..... new guy here. I own a Rockford RF2000 amplifier... yes, it's home audio. It's identical to a Hafler JF2000, but harder to find. I would like to upgrade/modify it. Does anyone have suggestions? I am including a link to the schematic....PDF was too large to attach. I contacted a guy that does some work on this stuff..... he suggested that I replace the NE5532 opamp chips in the input stages with Burr-Brown OPA2134 chips and that I replace the 47uf/100v caps on each output stage supply rail to the "largest caps that will physically fit the spaces". Does anyone have suggestions?? Thanks a million!! s9.quicksharing.com/v/8943762/RF2000_schematic_1_.pdf.html __________________ Gabe

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17th April 2007, 08:47 AM	#2
d3imlay diyAudio Member Join Date: Sep 2004 Location: Ohio	A local vendor bought the old Rockford stock and built up a bunch of these in the early 90's. I tested them. They either worked or they didn't and I didn't think they'd hold up. All those paralleled fets seemed like a failure waiting to happen. As I recall the opamps are all soldered in and the whole amp is one large board. If you do change opamps I'd suggest putting in sockets. Other wise, this is one amp that if it's working I'd leave it alone.

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