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In Reply to: Re: what determines the "speed" of an amp? posted by john curl on February 14, 2000 at 19:27:27:
I've just checked my service manual, for the numbers. It states:"Slewing rate: Faster than 11 Volts per microsecond."
The owner's handbook says the same thing. Yeah, before you ask, I've retained the original packing box, too. Whasat? Did someone mention 'Anal Retentive'?
How long did your 500 last? As service manager, I repaired every one of the things that made it to Australia (only 3 did), at least 5 times, before I got a hold of some decent Japanese output devices, to replace the horrible old Motorola things. Legend has it, that Marantz built 300 Model 500 amps. From initial design, to the end of the warranty, the whole episode was a US$3 million loss, for the company. Legend has it that Jim Bongiorno had something to do with the design (I'm not suggesting that the two facts are related, BTW). Marantz replaced the 500, with the 510/M. Possibly the foulest sounding amps, ever released by ANY hi fi company. It was reliable, though.
Trevor
... when he identified AA as the best audio forum on the Web.John and Trevor,
I once watched a frined pop the electrolitics in his 500, not once, but twice! Both times he was trying to test at full power on a McAdams tester, but the caps blew like firecrackers before clipping set in. The second time it happened, he was trying to prove to everyone that the first time was a fluke. Both times he was showing off the new gear to a crowd, and both times Marantz repaired the amp. After the second incident, the amp was returned with a note requesting that he not do any more testing on the McAdams. I guess those oil-cooled resistors just presented too complex a load for the poor thing. It sure was an embarassment to Dennis.
I actually sold one of the things to a guy once, but only at his insistance. Not that it sounded bad, but after the confetti came out of two of the things I found it hard to recommend them.
Interesting conversation guys.
Thanks,
Charles
The McAdam, I used, had air cooled, aluminium-clad Dale, 250 Watt resistors, mounted on a large heatsink. I melted the solder, on the cables, connected to the resistors, under full power tests, with my Marantz 500, once. The 500's most serious problem, was the fragility of the output devices. There are two electros, used on the driver supply, which were prone to failure. I wouldn't like to see the main electros fail, though. Those puppies were BIG. The mess would be terrible.Trevor
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