Testing A 80

[floydfan]

Hi All

I've been doing a bit of decorating and carefully took my system apart and put it back together again. When I fired it up there was an awful screech so I quickly turned off and rechecked my connections. It seemed that a positive speaker lead to one of the A80 units was a bit loose so I pushed back in and all was fine. Today I had some hum when playing vinyl so investigated and checked all leads were secure and the hum reduced but on turning on later I got the screech from the same A80. I turned off but the leads seemed secure. So am seeking advice before messing about.
Is there any way to check if there is a fault in the unit without damaging anything?
The screech is very loud and not good for the nerves so any advice will be welcome

[Fretless]

Look at the interconnects - I had this with my A40's when the cats had buggered my SSP mk1 leads.

Hope the Doc is along soon

[Daniel Quinn]

yes check for a loose ground wire on your interconnects .

swap interconnects and use the other a80 . if the are okay the fault lies with the amp .

[Dr Bunsen Honeydew]

It is an intermittent earth connection either in the interconnect cable or in the amp.

[floydfan]

Thanks. I will check the interconnects and hope its not the amp. I'm not sure what type of interconnect but they are NVA.

[Daniel Quinn]

if you have got any cheap generic moulded ones , use them as substitute as it helps to narrow it down and saves you unplugging and replugging the NVA ones

[floydfan]

Don't have any other interconnects but I removed the suspect one and fiddled about with my multimeter and when I wiggle the wire I get a break in continuity. Not 100% sure as I would need three hands to hold the probes tightly and wiggle the wire.
Is there a way to take apart the plug to get a proper look?

[Dr Bunsen Honeydew]

Depends on which model and how much heatshrink on it, can you give us a pic. The best bet is order a set of soundcord if you need a cable or pop to your local Maplin and get as cheap as poss. If everything then works send back the nva cable for repair.

[floydfan]

Found an old interconnect. Works so will send back the faulty one. Glad it wasn't too serious.

[Dr Bunsen Honeydew]

Enclose a note with full details, again I am still receiving returns with no note. I really do not understand what people expect from me.