I have an old poweramp Denon POA2400 that i want to recap and give a little Tlc. The main capacitors in the powersupply are Nippon Chemicon 10000uf 80v
seriesDL which are probably obsolete now, but when i search for it online, it feels more like they dont exist at all. Do anyone here know anything about that specific series?🙂
seriesDL which are probably obsolete now, but when i search for it online, it feels more like they dont exist at all. Do anyone here know anything about that specific series?🙂
The powersupply rails is 72v with 220v mains. So I would say something like 74v now.
It is from the late 80s
It is from the late 80s
I already have a handfull of Cornell Dubilier 380LX 10000uf 80v. Can i use those? It will save me a lot since I need 8 for the ps.
Yes, those are very good caps. Capacitors can last for a very long time depending on the use they've had, don't throw the old ones away, measure them if you can
Before you do anything else, measure the ripple on the power supply when there is no input and no output.
That gives you a reference to compare any future changes.
If you have the resources it would be useful to input a 1kHz test signal adjusted so that you have a 10W output (8.94Vac) into an 8ohms dummy load. Remeasure the ripple for this 10W output. Gives another reference for comparison.
With a shorted input, measure the output offset (mVdc) and the Hum+Noise (mVac).
That gives you a reference to compare any future changes.
If you have the resources it would be useful to input a 1kHz test signal adjusted so that you have a 10W output (8.94Vac) into an 8ohms dummy load. Remeasure the ripple for this 10W output. Gives another reference for comparison.
With a shorted input, measure the output offset (mVdc) and the Hum+Noise (mVac).
I guess I can measure mv ac on the rails with my Fluke DM if the amp will turn on without
incident, before I replace anything. It hasnt been connected since 2014😀
Anyway thanks for your input guys
incident, before I replace anything. It hasnt been connected since 2014😀
Anyway thanks for your input guys
Mmm, is there anyway you can power it up slowly? Would you have a variac transformer or anything like that? Have a read of this, it might be an issue with an amp that hasn't been turned on for a while http://www.diyaudio.com/forums/parts/51492-reforming-electrolytic-capacitors.html
I did it the hard way, and it ran the selfcheck and turned on as normal😀
So now I will let it stabilize for some hours before I measure😛
So now I will let it stabilize for some hours before I measure😛