McIntosh 275

[east electronics]

Need some help
Amplifier goes on protection on the left side only
It is supposed that if any of tubes has a problem then protection flashes tuber red
here this is lot the case
if you swap tubes form the other ch you have the same failure
If you remove tubes totally from the ch still you have this protection issue
Can anyone help ?????

 

[waltube]

Can anyone help ?????

If the issue exist if you remove the tube from the channel maybe the problem is on the logic of control


Walter

 

[east electronics]

Can you provide any hints where to llok at ?
Amp is far away from me but i will be traveling there any day so i need to have an idea what to have with me

Thanks

 

[euro21]

Are you sure, that load (speakers) is connected to amplifier?
If not, the protection is activating.

Other possible reason is lack of the negative voltage (diode broken).... if tubes are OK.

BTW read this:


Auto OFF is disabled?

 

[east electronics]

amplifier blinks red before everything else one ch only so it cannot dissangage from protection ...Obviously this has nothing to do with the speakers sice we havnet get there yet
Other ch presumably working cannot perform the warm up procedure from amber to green since amp stays on portection