It was just the fuse.. again?

[jbeckva]

My CV's had the breakers (bypassed) of course.

The breakers are bypassed here too, but I think I'm going to keep the fuses in there.. just in case.

 

[Web Police]

Aww live dangerously, put a 20 amp fuse in that sucker.

 

[speakerman1]

How many have you blown? Not a good thing. I may be getting a Phoenix amp I can let you use to burn it in. If you want. Tell me what you think. You may like it.

Larry

 

[orange]

All's I gotta say is HMMMMM on this one...

When I first got a hold of my M-80 Yamaha, I plugged it in, fired it up, and it promptly blew the main 10A fuse on it. Out of desperation I put another one in, and it worked fine for at least a year until about a month or so ago.

So I got a pack of 10A fuses and put another one in tonight, thinking "ok... so I see a blue flash real quick, and then I can start ohm'ing stuff out" but also knowing what happened before, I held a little bit of hope out...

And it worked.. fine.. not a problem at all.... Powered right up and I'm listening to it now again.

So I'm thinking here.. either it's the initial inrush current with the bigger caps doing it or something is being intermittent like the 33K uF caps I have not replaced yet. If it was something really major, I think I would be cleaning the heat sinks.. scraping of bits and pieces of the outputs that went into meltdown.

I wonder tho... this M-80 pulls about 60 watts of power with no signal input (and with the auto class A OFF). If you have one of these and can measure the current draw, I'd appreciate a comparison. If it's too much of a difference I'll take a deeper dive into the issue, but other than that... I'm scratching my head a lil bit.

Clean or replace the power switch.

 

[jbeckva]

How many have you blown? Not a good thing. I may be getting a Phoenix amp I can let you use to burn it in. If you want. Tell me what you think. You may like it.

Larry

Like I said, just this once plus when I first purchased it. I was about ready to ream the seller then, but just like this time I simply replaced the fuse and all is fine now. I do think there's some credence to give to Lee's theory about the caps being discharged tho - I seem to remember not powering it up for some period beforehand. (just powered it up now.. yup.. still good!)

 

[jbeckva]

Clean or replace the power switch.

Hmmm.. you may be onto something there... The physical movement has always seemed a little bit "weak" to me...

 

[laatsch55]

Got a cherry 700B for 100.00 because of a faulty power switch, weirder shit has happened.