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Old 5th November 2010, 10:56 AM   #11
gk7 is offline gk7
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Location: Vienna, Austria
Default Schematics

I eventually found my MA-620 schematic. Attached is the part with the main
amplifier board.
If you need the complete schematic or higher resolution you may download
it here: Index of /ma620
Attached Images
File Type: jpg ma620_2.jpg (172.7 KB, 286 views)
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Old 11th September 2011, 11:43 AM   #12
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Default INKEL PC-800A

hi i know its an old post but do you still have the manual for a
INKEL PC-800A

many thankx dave
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Old 11th September 2011, 11:45 AM   #13
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hi do you still have the manual for
INKEL PC-800A thanx
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Old 26th April 2012, 10:14 PM   #14
claesai is offline claesai  Sweden
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Quote:
Originally Posted by burbeck View Post
hi
i can help you with this, i need an email address to send them to
Hello "burbeck"! You are my last hope to find any wiering diagram or schematics of "Inkel MA-830". Could You send me any useful document by mail? I would be most greatful! Best regards,
Claes Ahlin, Härnösand, Sweden
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Old 26th April 2012, 11:17 PM   #15
burbeck is offline burbeck  United Kingdom
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hi
i have the schematic of the PC800a

i do not have one for the MA 830
drop me an email address to get this
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regards
bob
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Old 5th October 2012, 08:06 AM   #16
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sorry to bring this back from the dead ......


It is very well known around the PA people that most of INKEL and earlier Inter M amplifiers are notorious for shelf destroying or generally destroy any speaker connected on them ..

I dont really think that there is any operative MA 620 as we speak but just in case here is the info :

At the MA 620 the pcb designer skipped or failed to design a proper vbe multiplier attached on the heatsink...The related parts are located on the pcb ...combine this with the poor ""natural "" cooling, the only vent exists in the device will ventilate the inside of the amp while the transistors will dissipate heat only from the quite big heat sink .... that is thermal run away

Now think ... the ventilator will cool down the inside of the amplifier ...the pcb, the vbe multiplier and while the vbe multiplier will think that the amp is cool will eventualy increase the bias while the output stage will be in a boiling status ....Double thermal run away .

Please replace Q109 R,L with a BD 139 use 3 leads of cable and attach firmly in any existing screws of middle output transistors .....

Adjust for 10mv over 0.27 ballast resistors

Expect the suggestion to preserve a very stable bias and start to decrease in a marginal level for distortion around 70 degrees on the heat sink but one way or another at this temperature the double safety thermostat will shut you down .

Kind regards
sakis

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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 5th October 2012, 10:17 AM   #17
claesai is offline claesai  Sweden
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Quote:
Originally Posted by burbeck View Post
hi
i have the schematic of the PC800a

i do not have one for the MA 830
drop me an email address to get this
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Old 8th October 2012, 04:45 PM   #18
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Right here, Inkel MA-320, 420, 620, 920 constructions manual.
Inkel Ma 320 420 620 920 Operating Instructions (13.1Mb) Download
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Old 8th October 2012, 04:56 PM   #19
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well done Walkalone

I think that is a rare document

Kind regards
sakis
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SERVICE ΕΝΙΣΧΥΤΩΝ ΚΑΙ ΙΑΠΩΝΙΚΩΝ ΜΗΧΑΝΗΜΑΤΩΝ ΗΧΟΥ www.eastelectronics.gr
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Old 9th October 2012, 07:53 PM   #20
claesai is offline claesai  Sweden
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Please, I'll be happy to receive chematics of PC800! My e-mailaddress:
claes.ahlin@abc.se or claes.ahlin@gmail.com.
Thanks a lot in advance! // Claes Ahlin, Härnösand, Sweden
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