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Old 7th October 2010, 07:43 AM   #241
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Luke View Post
Hi Jacco,

I didnt think the pmf550 had a fan, heres some pics, these were pretty cool in the day.
back and front are very thick, and looks like they house the fans
anyway, its massive heatsinks
looks great, inside
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Old 7th October 2010, 08:17 AM   #242
Luke is offline Luke  New Zealand
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Originally Posted by tinitus View Post
back and front are very thick, and looks like they house the fans
anyway, its massive heatsinks
looks great, inside
yeah its hard to see, but I thought Perreaux only used fans in his pro amps.
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Old 7th October 2010, 08:21 AM   #243
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may i have the pcb layout for this amp
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Old 7th October 2010, 08:22 AM   #244
wahab is offline wahab  Algeria
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Originally Posted by gaborbela View Post
I have 15 pairs orig Hitachi why should I buy those Renesans I do not like them.
Any current device marked Hitachi is probably a fake...
Renesas is the merging of Hitachi and Mitsubishi semi dpts
as specified in this PDF...
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Old 7th October 2010, 08:59 AM   #245
alex mm is offline alex mm  Romania
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Default Protection schematic GOLDMUND

..... same protection schematic in other way drawed .Please tell us some electrical data information about used relay , coil voltage , and dc resistance ...
Thanks Alex.
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Old 7th October 2010, 10:41 AM   #246
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Quote:
Originally Posted by Luke View Post
didnt think the pmf550 had a fan
Luke,

neither the PMF-5150 nor the PMF-5550 has a fan. (but the company loves to stick fans in amps. )

Both models use Hitachi 2SJ56/2SK176 devices.
125W Pd each, times 12 makes a total Pd of 1500W.
Both are 500W/ch models, 1500W Pd divided by 500 makes 3.

(both amps had 100Vdc rails, which was not very wise for 200Vds devices)
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Old 7th October 2010, 10:47 AM   #247
Luke is offline Luke  New Zealand
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Quote:
Originally Posted by jacco vermeulen View Post
Luke,

neither the PMF-5150 nor the PMF-5550 has a fan. (but the company loves to stick fans in amps. )

Both models use Hitachi 2SJ56/2SK176 devices.
125W Pd each, times 12 makes a total Pd of 1500W.
Both are 500W/ch models, 1500W Pd divided by 500 makes 3.

(both amps had 100Vdc rails, which was not very wise for 200Vds devices)
All the pro amps they made had fans. Not Hifi models.
They claimed the 5550 can deliver 1500 watts per channel, I cant really remember. I know it can run all day long delivering 1000 watts/ch. All the older pmf amps delivered twice the rated power into 4 ohms continuous. I had a 3350, and the baby 1050 which I still have. The 3350 I regret selling.
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Old 7th October 2010, 10:55 AM   #248
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Luke,
That interior shot has a nice uncluttered housing. Very neat and organized.

I thought that Renasas and Hitachi devices were made at the same location with the original equipment and spec. The only thing that different was the companies merged and the name changed. Even when Hitachi was branding there name on the devices that did not mean they were manufactured in Japan in there plants. Stuff from good reputable companies is outsourced all the time to save labor costs and take advantage of low bidding. I mean is On Semi transistors really that different than an old Motorola transistor.
I have for quite sometime wondered if the Toshiba j109bl jfet fakes were really, spec wise, that terribly bad. Any company that can tool up to manufacture semiconductors must realize the initial cost to begin production is way to large to just sell outright junk. Just because someone is stealling your name does not necessarily mean they are going to abuse it. It may be to the contrary to continue profitting by making acceptable merchandise.
Tad
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Old 7th October 2010, 11:03 AM   #249
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Only Lateral MOSFET amp company i've seen that ran such big hurds of output devices without source resistors.
Both the 100W and 125W devices (J and K) are rather easy to match, see Juma's thread for an example : simple cirklotron with Lateral MOSFETs.

(Japanese parts that have Japan printed on them in general are/were manufactured in Nippon, blanks are/were made somewhere else)
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Old 7th October 2010, 11:07 AM   #250
wahab is offline wahab  Algeria
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Quote:
Originally Posted by jacco vermeulen View Post
Only Lateral MOSFET amp company i've seen that ran such big hurds of output devices without source resistors.
Both the 100W and 125W devices (J and K) are rather easy to match, see Juma's thread for an example : simple cirklotron with Lateral MOSFETs.
I use three pair/channel matched 2SJ48/2SK133 without source resistors..
True that i m not a company...
I ve seen it done in a german amp that did use these same devices..
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