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strange amp problem...

J

JamesTaylor85

Jan 29, 2009
78
2
Queensland, Australia
www.myspace.com
#1
so i have an ashdown EVOIII 900 running into an ashdown ABMII 8x10,
lately when i turn the amp on to play its been what sounds to be feeding back, just a nasty screech unless i mute the amp using the inbuilt mute.
if i pull my bass out of the input it stops, if its plugged in but bass volume is down and tuner mute is on it still happens.
only lasting for 30seconds or so ive just turned it on and left it for a bit on mute then played, but its a little annoying/worrying...

ive also changed basses and still same thing, ive tried a number of different things to see if its one problem or the other but no to avail.

any ideas?
 
#4
JamesTaylor85 said:
so i have an ashdown EVOIII 900 running into an ashdown ABMII 8x10,
lately when i turn the amp on to play its been what sounds to be feeding back, just a nasty screech unless i mute the amp using the inbuilt mute.
if i pull my bass out of the input it stops, if its plugged in but bass volume is down and tuner mute is on it still happens.
only lasting for 30seconds or so ive just turned it on and left it for a bit on mute then played, but its a little annoying/worrying...

ive also changed basses and still same thing, ive tried a number of different things to see if its one problem or the other but no to avail.

any ideas?
Click to expand...

Hi JamesTaylor85.

It sounds like your ABM 900 EVO III Head may have a microphonic (bad) pre-amp tube (valve).

Your amp's owners manual doesn't explain how to replace said tube.

Please contact Ashdown for advice on how to proceed.
 

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