[HELP] Peavey 5150 combo

[Weiht]

Look at the filament inside. If it is broken

 

[CaboWabo]

It looks connected, guess i've to go get some power amp tubes eh?

 

[CyanideJunkie]

Get some preamp tubes as well, just in case. Match the fuse value to what's recommended. It's better for your fuse to blow than to fry your OT.

 

[Weiht]

Get SED c winged 6L6 tubes, best i tried so far!

tungsol 12ax7 is the sweetest modern tubes u can get.

change the phase inverter as well

 

[CaboWabo]

Get SED c winged 6L6 tubes, best i tried so far!

tungsol 12ax7 is the sweetest modern tubes u can get.

change the phase inverter as well

Phase inverter? Lol bro I'm really an idiot when it comes to electronics , all this fuse, tube swapping the best I can do without burning my house down haha

 

[dodgethis]

The Phase Inverter is the 12AX7 tube in the power amp section.

 

[CyanideJunkie]

Just so you know, besides the mains fuse, the 5150 has 4 internal fuses as well. It would be good if you can check those too.

If you're really not confident about troubleshooting your amp, it will be best if you send it down to a qualified tech instead, lest you accidentally damage it.

 

[CaboWabo]

Just so you know, besides the mains fuse, the 5150 has 4 internal fuses as well. It would be good if you can check those too.

If you're really not confident about troubleshooting your amp, it will be best if you send it down to a qualified tech instead, lest you accidentally damage it.

I'll try to swap the power tubes first, hopefully it works if not i guess i gotta burn a big hole in my wallet.
anyway i just took a picture of my power amp tubes does this burn marks look normal ?

 

[CyanideJunkie]

I'll try to swap the power tubes first, hopefully it works if not i guess i gotta burn a big hole in my wallet.
anyway i just took a picture of my power amp tubes does this burn marks look normal ?

Whoa, those are some heavily-used tubes! It's hard to tell from sight alone if they're blown, but I would replace them in any case. It's usually a good idea to replace power tubes once every year. Blown power tubes can blow fuses too.

Read this.

 

[CaboWabo]

Whoa, those are some heavily-used tubes! It's hard to tell from sight alone if they're blown, but I would replace them in any case. It's usually a good idea to replace power tubes once every year. Blown power tubes can blow fuses too.

Read this.

yeah guess i was abusing my tubes by leaving it on all the time, hmm my case sounds rather similar to that thread...
only thing now is hoping the fuse inside didnt blow, if not gotta break my back lugging that behemoth of an amp to sim lim and paying 80+? to change a fuse

 

[CyanideJunkie]

yeah guess i was abusing my tubes by leaving it on all the time, hmm my case sounds rather similar to that thread...
only thing now is hoping the fuse inside didnt blow, if not gotta break my back lugging that behemoth of an amp to sim lim and paying 80+? to change a fuse

A dolly is your best friend in cases like this. If you bring it down to Goose, he'll do a tune-up for your amp too and give it a look over. You'll never know, it might highlight some other faults with the amp as well.

 

[Weiht]

Change the power tubes yearly? That's a bit of a luxury i guess. Most of us don't crank the tubes loud enough into a big 100w cabinet, so it's more likely to be underused.

Just be sure that the tubes are biased properly, and you can actually run not so hot if you want better lifespan.

I usually let it go on the higher side of the recommended range and I don't replace my tubes yearly.

Picture alone can't tell lah bro. I had mine buzz and flicker with flashes before, that's when I know its time to change!!

 

[CyanideJunkie]

Change the power tubes yearly? That's a bit of a luxury i guess. Most of us don't crank the tubes loud enough into a big 100w cabinet, so it's more likely to be underused.

Just be sure that the tubes are biased properly, and you can actually run not so hot if you want better lifespan.

I usually let it go on the higher side of the recommended range and I don't replace my tubes yearly.

Picture alone can't tell lah bro. I had mine buzz and flicker with flashes before, that's when I know its time to change!!

It's not so much about driving the power tubes hard as it is about tube life span. Vacuum tubes don't have a shelf life, but they do have a usage life that starts counting down the moment they're installed. Tubes left inactive for too long in an amp can easily go bad as well. In all honesty, the best way to prolong tube life(besides proper biasing) is to leave them on throughout. That's why you see so many of the tube hi-fi guys leaving their sound systems on throughout. Of course, the caveat is that this isn't exactly healthy for the wallet in terms of electricity bills.

There are horror stories about PCBs getting burnt due to the power surge frying caps when a tube blows. Sure, these are real extremes but who knows right? I'm just looking at it from an engineering perspective, making sure that my amp's overall performance remains predictable and therefore, controllable.

 

[CaboWabo]

Finally had the time to bring my amp down to a tech, turns out it's the fuse inside the amp and apparently the prev owner had mismatched fuse in them. Thanks for all the inputs guys, much appreciated