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Old 12th November 2012, 08:10 PM   #1
jimb0s is offline jimb0s  United Kingdom
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Default Denon Output Transistors.

Hi, I have a Denon AVC-A11SR (AVR 4802) amp that has blown a pair of output transistors.

MN1715 and MP1715, they are large plastic devices like the Sanken MT200 case. I have scrolled web without sucess. They are used in a number of their larger amps from the AVC-A1SE, AVC-1SR, AVC-A1VX etc as well as in the AVR's that match, so any help will be gratefully received.

I blew these driving a Quad ESL989 (rather hard) and on one of the Quads shut down's (thernal overload) the amp shut down as well. Now I have a QUAD 909 driving the ESL's as they handle the loads with out fail!!

Last edited by jimb0s; 13th November 2012 at 10:58 AM.
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Old 12th November 2012, 08:32 PM   #2
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here you go
mn1715 | eBay
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Old 12th November 2012, 08:40 PM   #3
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Make sure that the drivers are good too. Nothing worse than replacing the output transistors and watching them go 'poof' because the driver transistors are bad.
Sorry to say ... 'been there many times.'
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Old 13th November 2012, 09:31 AM   #4
jimb0s is offline jimb0s  United Kingdom
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Thanks guys, always been a bit suspicious about buying components out of China. Thinking though that one.....um... the Amp originally came from there!!

I have checked the drivere and power supplies which in this case are ok.

I wrote the above from one brain lobe whilst thinking in an other. Ideally what I am looking for is a data sheet or just a description of them. I thought that they were a darlington as the earlier Denon amps used the MN15N - MN15P darlington combos. Comparing circuits between these amps the voltage acrss the base's are very close. These being 2.2Volst for the MN15x's and 2.4Volts for the MN/MP pairs.
I have tried unsuccessfully in fabricating darlingtons from differing discrete components but have always had problems setting the bais. (just proving that a little knowledge is dangerous!)

J
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Old 13th November 2012, 10:22 AM   #5
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may be a silly question but have you tried Denon? Manufacturers often keep a stock of spare parts many years after the parts are no longer manufactured or available through normal channels.

Tony.
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Old 13th November 2012, 10:55 AM   #6
jimb0s is offline jimb0s  United Kingdom
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Yes I have. Not sure what service Denon offer down under but here they are a nightmare.

After numerous phone calls and email's I was given a phone number for an outlet that sold them. Only when I contacted them they wanted 55.00 plus postage per device, and to top it off they would have to order the part from the east after I paid up front for them!! grrrrrrrrrrrrrrrr
j
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Old 13th November 2012, 11:03 AM   #7
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yikes 55 pounds each So it was a silly question!!
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Old 13th November 2012, 11:17 AM   #8
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perhaps my google search results are different...
Denon Electronics Q-mn1715)o/p/y)lf | 2740199004 | Denon Electronics
Denon Electronics Denon Mp1715 | 2710296005 | Denon Electronics

However the on backorder (arives in 14 days) for the MN1715 may be of concern...

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Old 13th November 2012, 02:21 PM   #9
jaycee is offline jaycee  United Kingdom
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I would expect they are really house numbers for an equivalent Sanken part. It may be worth trying to discover which one.
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Old 13th November 2012, 07:53 PM   #10
RS232 is offline RS232  United Kingdom
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Little Diode is a very good source of semiconductors.
Give them a try, I'm happy with their service
On the house P/N I found out that the Kenwood TRAIT transistors are the same as the SAP15/6 used by Cambridge Audio.

Ric
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