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Lucasdude View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 9:22am
Originally posted by EmPro EmPro wrote:

i couldn't save the original inscriptio6n on the front panel as it was way to rusty....right ch was dead (outputs blown) left ch working,now is fully working :) Old School Cloud GS 3002

Graphic needs some new graphics!
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EmPro View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 10:05am
Yeah LOL
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 10:10am
From a fried HH S500d i rebuilt a couple of years ago. Basically it had 3 shorted output devices,and that then took out every transistor on this driver board, and a dozen passive components too.



Be seeing you.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 10:13am
Rebuilt module.

Be seeing you.
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EmPro View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 10:36am
Is it true that S500D doesn't have any dc output protection?? If that module was so bad i assume the speakers had no chance Cry
i'm a HH fan,i have: HH V-S Musician combo 2x12,with 100w rms in 4r and quasi comp 2x2n3773 as outputs,HH MA150 amplifier,150w rms with 2XBDY37A as outputs,HH SM200 powered mixer 2x100w rms with two modules with 2x2n3773 on outputs,HH V800 2x400w rms in 4R with 8 lateral hitachi mosfets per ch 4x2SJ50 and 4X2SK135,also i have 6 HH M900 (basicaly HH V800 install version).


Edited by EmPro - 28 May 2022 at 1:59pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 10:40am
HH MA150,all parts original,no faults on this one:



Edited by EmPro - 28 May 2022 at 12:02pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 10:47am
Originally posted by EmPro EmPro wrote:

Is it true that S500D doesn't have any dc output protection?? If that module was so bad i asume the speakers had no chance Cry



This was common on amps from that era, S500d, Crown DC300a, Phase Linear 700b, MM AP 360, none of them had any DC protection. Speaker fuses need to be fitted in-line.
Martin Audio even fitted big electrolytic caps into their bass cabinets to protect the drivers.
Be seeing you.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 10:48am
Here i have a Crown D75,the fault was just one output transistor....yeah...strange..all the other components perfectly fine lol,ofcourse i replaced both outputs,the drivers where totaly fine so no need replace,the amp is working flawless now,tested in heavy load untill the case temperature got 50-55c:



Edited by EmPro - 28 May 2022 at 2:02pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 10:49am
yeah...i got the point mate,cheers.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 11:10am
This HH MA100 was a case of some sort of liquid damage as the marked circuits was covered in some sort of sticky thing,C7 was exploded LOL and all the other capacitos where done...strange but true...all the transistors survived,predrivers,drivers and outputs all original,so after full recap and one resistor replaced related to C7 i fired it up and surprise: 47vcc on outputs with all the parts measured with Fluke177 and shows good....then only one remains...the TL741 (UA741)...after replacement 0.037mv on outputs and fully working order,somehow the IC was putting out 6vcc on pin 6 (output pin) but the zenner diodes responsabile with +-15vcc supply were good.



Edited by EmPro - 30 May 2022 at 2:21pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jbl_man Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 11:20am
By the way, those 100w HH pa/guitar amps also had no protection, so will take out a speaker with 47vDC just as easily as a bigger one.
Be seeing you.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote EmPro Quote  Post ReplyReply Direct Link To This Post Posted: 28 May 2022 at 11:31am
Originally posted by jbl_man jbl_man wrote:

By the way, those 100w HH pa/guitar amps also had no protection, so will take out a speaker with 47vDC just as easily as a bigger one.

Yeah i know LOL,but not so easy to blow up one LOL
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