AVT50 VALVESTATE 2000 No Sound at Loudspeaker

[snsent]

Marshall AVT50 VALVESTATE 2000 No Sound at Loudspeaker

Headphones & CD IN is fully working but no sound at loudspeaker. All LED is working. Fuse is ok. Tube also ok. AVT50-60-00 Board.

Any Idea to fix it..?

Thanks In Advance.

[Chuck H]

Did you:

Try another speaker?

Try that speaker with another amp?

Jumper te FX loop?

Try injecting signal at the FX loop?

[Enzo]

The4 headphones on the AVT50 run off the main ppowr amp, so if they work and the speaker does not, it is either the speaker or speaker wiring as CHuck suggests or the headphones jack cutout contact is not coming together when no phones are used. Press down on the sleeve contact on that jack and see of that wakes up the speaker.

[snsent]

Speaker & cable is ok when tested with others amplifier. Already jumped to FX loop but still same ( No sound )

[snsent]

Headphones jack just working when using CD input ( mp3 player ) but headphones is not working if I connect it ( guitar / mp3 player ) to INPUT. I already change R81 cause that resistor is nearly burn. ICTDA7293 is maybe OK cause not have any burn smell.

[Enzo]

CD comes through the phones? Does CD come through the speaker too?

[snsent]

Hi Enzo & Chuck H,

I've found a answer for my problem. Phones Jack in have some problem and I was change with new one and that amplifier fully working as usualy.

Thanks for your help...

Now, I had one problem on Peavey Combo 300. That amplifier is working but sustain sound is very bad ( DUUUmmmmmmbrbrrrr )

How can I fix it...?

[Gtr_tech]

Try cleaning the patch jacks on the front panel. There's 2 send/return loops and the "return" jack has normally closed contacts that are supposed to pass signal when nothing is plugged into the jack. Over time the contacts can get dirty/oxidised and then signal won't make it thru properly.....or maybe not at all. Jumper those loops with short cables to see if it brings normal signal. If so....they need cleaning or possibly replacement if they're really bad off.