gfa-585 on it's way out

[Me Myself & I]

I have out 3 watt's clean out put p/ch then distortion plus speaker inverstion I drive two black widow 18's of it. I am looking for some thought's.

[F1nut]

I have no idea what you are asking.

[messiah]

Soumds like a bad unit. I'll give you 50 bucks for it if you want to ease your pain.

[Me Myself & I]

off a bull maybe I think it is a easy fix

[kawizx9r]

How olds the unit, where/when did you acquire it?

[comfortablycurt]

What?...we'd love to help...if you could possibly rephrase the question a little more clearly...

It's not exactly clear what you're asking here.

[Me Myself & I]

I DO WISH FOR HELP Me Myself & I;1101214]I have out put of 3 to 35 watt's clean out put p/ch then distortion plus speaker inverstion I drive two black widow 18's of it. I am looking for some thought's i do not feel that the out put trasistors are blown the vol is equil the fuses are good caps are clean no fliuds, it runs less then warm as always BUT I did get a AC SOUND ON THE RIGHT CH when the power was turned on but only after the caps were discharges

[kawizx9r]

I'd try going through adcom support, just my .02 Saw the specs on it (and the normal output at 8ohms is NOWHERE near 3-35 watts).

[Me Myself & I]

this is Y it is on its way out I drive two 18 inch subs of of it plus I run a ap-2020 running two marrathon 18 inch sub this is just my bottom end I can not wheald any more the 35 per chan out of my 585

[Me Myself & I]

i do know my specs and i love feeling what this amp gave to us but it is crapping out like it runs a class then craps out when it goes to b class . and i thought that that did not happen till about 55 watts

[Me Myself & I]

1987 is what is printed on the boards bought it at SOUND HOUNDS victoria bc CANADA Unit # 2566 out of 3000

[F1nut]

the black widows kilded it 2 much inverstion

[Keiko]

the black widows kilded it 2 much inverstion

Oh chit!

[nguyendot]

+1 on calling Adcom support. They are far more versed in the technical aspects of this unit that we are.

[Face]

Proper English and disabling the caps lock key would make your posts much more coherent. Then maybe we could help you better.

[Polkie2009]

Are they the Peavey Black Widows???

[heiney9]

Check for leaking caps on the input board. Adcom had a bad run of caps that prematurely leak and causing high dc offset as well as the problems you are trying to describe.

It's a PITA to clean the eletrolytic off the boards, very tedious and needs a meticulous person to spend some time and do it correctly. There are several posts here on the subject and over at diyaudio.com

Get your learn on and try to type in proper English.

H9

[heiney9]

All the parts need to be removed form the input board and put in a solution of Simple Green mixture and put in an ultra sonic cleaner. Rinse and repeat 3-4 times. Then all the parts need to be re-populated and then using a Variac or the light bulb method slowly bring it back up and then start taking measurements to be sure the board is in fact completely free of electrolytic solution. Even a trace of electrolytic soution can cause high DC offset. If not you'll need to start over again.

New boards are no longer available so your only options are to clean them your self, have a very competent tech clean them or sell the amp on ebay as a parts amp.

H9

[reeltrouble1]

I sense the bottom is very near.

RT1

[organ]

Don't forget that if you decide to open the unit up for cleaning or to change caps that you know the electrical safety rules. If you don't have experience with working on electronic parts, I'd suggest you bring it into a repair centre. The amp can hold a lethal charge even when unplugged.

[Me Myself & I]

yes they are. i am wishing to fix my gfa-585 myself rather then take it too a shop.

[Me Myself & I]

all though i have not measured the caps ther is no sign of leakage.

[heiney9]

yes they are. i am wishing to fix my gfa-585 myself rather then take it too a shop.

The 585 is a bit of a complicated design. If you don't have working knowledge or a service manual I'd leave it alone.

There are several in depth discussion threads over at diyaudio.com

One started by our very own Ben.

I highly suggest you read those before attempting to fix the 585. If you don;t know what you're doing you'll certainly make it worse.

[GV#27]

I have out 3 watt's clean out put p/ch then distortion plus speaker inverstion I drive two black widow 18's of it. I am looking for some thought's.

Are you saying the output is now phase inverted?If so thats not really possible without modifications to the input stage.

[Monster Jam]

Waat is on thread here being sed I cant help me under stand.

[Me Myself & I]

sorry but no it will crap out after say 30 p/ch like the main caps are out of power when i try to push for more then the 30 the speakers will fluter with high distortion but at very low volume on sound till i turn it down. i do know what this amp is able to do and i was only using a 8 ohm load per /ch 2 18" blackwidows 4" voice

[Me Myself & I]

no smell no heat no thermal led

[Me Myself & I]

it still runs at very low levels

[Me Myself & I]

last year i was running 4 18" sub's off of this gfa-585, we had over a hundred guest's good size hall & it was for a wedding. this year i added a yorkville pa-2020 for more grunt & i have a wedding on the 18 th of july so i am looking for even more thoughts and i will look or the caps of the two input stages as it must be as this amp has two mono blocks two power suplys one transformer and one rely all the fuses are good both ch bag out

[fbm211]

What??