A370
#1 A370
Hi Chaps,
I've noticed on powering down the amp,it takes a while for the supply caps to discharge-not surprising with 100,000 uF a side!-and just as the caps are discharged,there is clicking and popping/beeping noises from each speaker.It's not the same through each channel i.e. each channel does it's own thing .Whaddaya reckon? Smoothing caps on their way out perhaps? Any thoughts advice gratefully recieved.
I've noticed on powering down the amp,it takes a while for the supply caps to discharge-not surprising with 100,000 uF a side!-and just as the caps are discharged,there is clicking and popping/beeping noises from each speaker.It's not the same through each channel i.e. each channel does it's own thing .Whaddaya reckon? Smoothing caps on their way out perhaps? Any thoughts advice gratefully recieved.
#3
May just be the tollerances on the caps means one side drops faster than the other. And the output devices may not be matched outside their operating current range.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
#4
Hi Ali
try the question on diyaudio, there is a lot of experience of mf over there and you'll probably get a response very quickly.
Have you got a circuit for the power supply, I'd love to see it if you have.
try the question on diyaudio, there is a lot of experience of mf over there and you'll probably get a response very quickly.
Have you got a circuit for the power supply, I'd love to see it if you have.
There's nowhere you can be that isn't where you're meant to be
#5
After seeing it in action at the weekend I think its just it releasing its stranglehold on the local power station and the slight thump is the rest of the system (and your house) breathing a sigh of relief.
Simon C
Simon C
#6
gpwmNick wrote:May just be the tollerances on the caps means one side drops faster than the other. And the output devices may not be matched outside their operating current range.
my experience of mf is littered with memories of clicks and pops
oh yeah, and a word to the wise....I lost a transformer in one of my stats a while back, and the only thing I could put it down to was residual clicking when I turned the amp off....needless to say I sorted the turn-off clicks pdq
There's nowhere you can be that isn't where you're meant to be
- Dave the bass
- Amstrad Tower of Power
- Posts: 12276
- Joined: Tue May 22, 2007 4:36 pm
- Location: NW Kent, Darn Sarf innit.
#9
Yep all done, I'll do an invoice for you....Ali Tait wrote:Thanks Gents.I'll try on diyaudio.Dave,have you replaced the blown fuse in your mains lead yet?
Simon,you may be right,I'll have to build it it's own substation!
I'll waive the charge for fuse damage if you send me a box of good quality Scottish electricity though!
DTB
"The fat bourgeois and his doppelganger"
#11
Got a reply on diyaudio from a bloke who used to repair MF amps! You were spot on Nick.It's the pos and neg rails discharging at different rates.Normal and nowt to worry about thankfully.Been advised to change the 'lytics,which I was going to do anyway.This amp does explosions better than any other amp I've heard!
#13
I'm using the amp in my system up in Scotland,with some B&W P5's on the end of it.I was really more worried about a dodgy electrolytic taking out one of the mosfets,as I understand these are unobtainium now.From what I've been told,it looks like the bias has been turned down in mine to let it run cooler,as the bloke says it should be running hotter than it is!