Denon PMA850 thrown out!

ROVSING · 20th October 2006, 01:26 PM

I was at the scrapyard with some gardenscrap and found this amplifier am i lucky !
Offcourse i had to try if it worked and it does!
Wondered if anyone had a schematic on this one
thanks in advance...

bikehorn · 21st October 2006, 04:58 AM

wow! nice find. i wish i found better stuff thrown out around here than beat up department store house-brand garbage electronics from the late 80's.

http://www.thevintageknob.org/DENON/PMA850/PMA850.html

ROVSING · 21st October 2006, 12:09 PM

After listening to it fore a couple of hours, i have teared it apart and cleaned it up, theres a biiig toroid inside, i'll send some pictures monday - it,s now as good as new...might change the capacitors in the PSU - well after 28 years that might be a good idea or what ?.
It sounds good after 20 minuts warm up periode, the bass regulation doesn't work maybe it needs a new pot.
But with a powerconsumption of 600 Watts, i won't let it play 24 hours a day....

ROVSING · 23rd October 2006, 06:43 AM

Here's some pictures, something is wrong with the riaa part it got a schratching noise, could it be dry capacitors ?

ROVSING · 23rd October 2006, 06:44 AM

another picture inside

ROVSING · 23rd October 2006, 06:46 AM

and the last one

artistmikeb · 11th December 2009, 08:48 PM

i similarly got mine from the local tip when you were allowed such things - has anyone got a schematic the pma 850 btw - also has anyone ever heard the tuner ?? best ive heard is the revox i think - the pma is not a bad amp and compares reasonably to decent valve gear - its also hefty enough to be able to drive electrostatics [eg maggys] ok

StevenOH · 11th December 2009, 11:06 PM

I have the SM. Make shure your e-m account will accept ~7MB file.

artistmikeb · 12th December 2009, 07:51 AM

many thanks - you are right ... the web site wont take 7meg so perhaps you could post it to mickeyburr@yahoo.co.uk as that will or upload to a site from whence i can download direct

jaycee · 12th December 2009, 07:57 AM

Wish I could find stuff like this at our dump (if we were even allowed to take it) - the best thing Ive spotted is lousy old 10% THD type midi systems and broken tv's!

20th October 2006, 01:26 PM	#1
ROVSING diyAudio Member Join Date: Sep 2004 Location: Fyn Odense	Denon PMA850 thrown out! I was at the scrapyard with some gardenscrap and found this amplifier am i lucky ! Offcourse i had to try if it worked and it does! Wondered if anyone had a schematic on this one thanks in advance... __________________ Frandsen

21st October 2006, 12:09 PM	#3
ROVSING diyAudio Member Join Date: Sep 2004 Location: Fyn Odense	After listening to it fore a couple of hours, i have teared it apart and cleaned it up, theres a biiig toroid inside, i'll send some pictures monday - it,s now as good as new...might change the capacitors in the PSU - well after 28 years that might be a good idea or what ?. It sounds good after 20 minuts warm up periode, the bass regulation doesn't work maybe it needs a new pot. But with a powerconsumption of 600 Watts, i won't let it play 24 hours a day.... __________________ Frandsen

11th December 2009, 11:06 PM	#8
StevenOH diyAudio Member Join Date: Jun 2004 Location: USA	I have the SM. Make shure your e-m account will accept ~7MB file. __________________ The truth is out there. Who can handle the truth?

12th December 2009, 07:51 AM	#9
artistmikeb diyAudio Member Join Date: May 2007	pma 850 sm many thanks - you are right ... the web site wont take 7meg so perhaps you could post it to mickeyburr@yahoo.co.uk as that will or upload to a site from whence i can download direct

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21st October 2006, 04:58 AM	#2
bikehorn diyAudio Member Join Date: Aug 2004 Location: toronto	wow! nice find. i wish i found better stuff thrown out around here than beat up department store house-brand garbage electronics from the late 80's. http://www.thevintageknob.org/DENON/PMA850/PMA850.html

11th December 2009, 08:48 PM	#7
artistmikeb diyAudio Member Join Date: May 2007	i similarly got mine from the local tip when you were allowed such things - has anyone got a schematic the pma 850 btw - also has anyone ever heard the tuner ?? best ive heard is the revox i think - the pma is not a bad amp and compares reasonably to decent valve gear - its also hefty enough to be able to drive electrostatics [eg maggys] ok

12th December 2009, 07:57 AM	#10
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Wish I could find stuff like this at our dump (if we were even allowed to take it) - the best thing Ive spotted is lousy old 10% THD type midi systems and broken tv's!

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