Ok....I've had this amp floating around for a few years now on the "around 2 it" bench and finally had a look at it....naturally it doesn't work. At least not completely....one channel is very eratic, switches are not happy and the overload lamp flickers on and off intermittently.
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Another BM4400
19 replies
A look inside gives a clue to its woes..... Login to view image
cobwebs everywhere..... Login to view image
underside look pretty clean however Login to view image
dusted away most o the debis and gave all the switches a blow over with de oxit and left them to soak.....did spot this....looks like a broken track Login to view image
left the deoxit to dry off and had another go...switches all operate much better, tried FM works fine both channels....so does the phono input, got it on test or the day see how it performs, the suspect broken track will need some attention/investigation for sure...nothing is getting hot right now.....so Dillen can I have a capacitor kit please? it's easier for me to buy from you that trawl the component websites ;¬)
Service kit etc. here.
And it looks a very nice project.
They are definitely worth it.
Well spotted, that break!
Martin
Hi,
Entirely worth the efforts. Mine has been to service every single day since its repair 10 years ago. The other day we went out for a few days, the 4400 had been left on. No problem at all. Once restored properly the 4400 is reliable and above all, sounds mighty fine. Mine feeds M70s in the lounge.
Jacques
discovered the individual responsible for the cobwebs...at least some of them i'm sure..... Login to view image
disconnected plug P11 and with the help o a little piece of wire connected to r168 220 ohm resistor and gave the suspect track break several hard pokes with a blunt stick, reading never budged.....so as I cant see the underside of the board im going to give it the benefit of the doubt for now....im considering running a piece of wire topside just in case.... Login to view image
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