amp pauses

[hybridauth_Google_112707221541523493430]

Not long ago, a purchased a vintage marantz pm451. I am temporarely using it with a pair of aiwa speakers till i buy new ones. The problem is that the amp (most likely) stops for about half a second or less and there is no sound at all. I know that the amp does not shut down and turn on again because it would take more time. I would say that the temperature on the top of the amp is about 40-50 C (100-120F). So does anybody have a clue about what is going on? Could it be something else?

 

[spiny norman]

Not long ago, a purchased a vintage marantz pm451. I am temporarely using it with a pair of aiwa speakers till i buy new ones. The problem is that the amp (most likely) stops for about half a second or less and there is no sound at all. I know that the amp does not shut down and turn on again because it would take more time. I would say that the temperature on the top of the amp is about 40-50 C (100-120F). So does anybody have a clue about what is going on? Could it be something else?

I'd suspect some kind of protection circuitry tripping, but 'half a second or less' sounds too short for that. Are you sure it's the amp that's 'pausing' and not whatever you have connected to it to play the music?

 

[hybridauth_Google_112707221541523493430]

its a pc...i didn 't have any problem with my pc speakers

 

[spiny norman]

its a pc...i didn 't have any problem with my pc speakers

In which case, unless the PC output is either clipping the amp's input stage (which is unlikely) or inhecting some electrical noise into the amp (which is almost as unlikely, but just possible), I'd suggest an intermittent solder joint in the amp, which 'opens up' with heat and then just as quickly connects again when signal isn't being passed.

However, the brevity of the interruption a) is rather unusual and b) is going to make the probem a devil to diagnose.

Sorry I can't be more help.

 

[hybridauth_Google_112707221541523493430]

thank you very much. I 'll wait for a while to see if the problem comes up again, if so I 'll see an expert.

 

[spiny norman]

thank you very much. I 'll wait for a while to see if the problem comes up again, if so I 'll see an expert.

If it persists, I'm afraid that may be the only answer. Good luck!