27 posts / 0 new
Last post
Rock_A_My_Soul's picture
Providence, Rhode Island
May 2003
11 years ago

So I was rocking out along to "Ball and Biscuit" today, and all of a sudden a weird sound started coming out of the amp (I was going straight to the Gibson). My first thought was that it was the Micro-synth or the Big Muff, because it was making weird distorted screechy noises, so I took those out of the chain. Then I just went straight to the amp, and still nothing. I switched from my Wildkat to my Hagstrom, and nothing. So I looked at the top of the amp and noticed that the red power light wasn't on. Then I looked at the back of the amp. The first thing I noticed was the terrible smoke-y smell. The second was that one of my tubes (an Electro-Harmonix 6v6) was glowing purple! PURPLE! I'm very much freaking out over this, as it's my favorite amp and I really don't have the money to fix it right now. What's going on? Why did this happen? Is there something I can do to prevent it from happening again once I get it fixed?

-Martin

Quote:

GuitarGeek: Why play guitar when you can talk about it?

A Man, A Plan, A Canal featuring my equipment and songs

Fender Jazzmaster/Univox Rickenbacker 360-12 copy/reissue Danelectro U2 -> Zoom Ultra Fuzz, Boss TU-2, Ibanez DE-7, Digitech PDS 2000, Boss DD-20 -> Fender Ultimate Stereo Chorus/Gibson Discoverer

*Noodles*'s picture
Oct 2003
11 years ago

um.... are you sure it was purple?!

that's a bit of an odd colour for tubes / valves to be glowing surely.
:confused:

Monkey See, Money Do Not - Bad Monkey!

JupiterKhi's picture
orange county, ca
Aug 2003
10 years ago

purple? the filiment is glowing purple? maybe there is something on the glass that is making it look that color.... besides that i dont see how its possible...

Fender American telecaster>MXR dyna comp>Boss tu-2>Proco Rat2>Boss Ge7>EHX Small Stone>Boss DD6>Yamaha MagicStomp>EHX DMM>Voodoolabs Tremolo>Boss dd-20>Roldand Space Echo>(all in krok feedback loop)Ernie Ball volume pedal>Vox ac-30tbx

other stuff:
Ebow
MicroKorg synth

acoustic:
Tacoma D38
Ovation Celeb.
still not enough

nobody's picture
Chicago, IL
Sep 2002
4 years ago

Dude, I wouldn't use the amp until you get someone to look at it. You risk blowing a tube or a transformer.

But the important thing is to make sure the plates inside the tubes aren't glowing cherry red.

"Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blind-folded fear."
- Thomas Jefferson

ikkyu2's picture
SF, CA
Nov 2003
3 years ago

That tube's dead. You shouldn't play the amp any more until you replace it.

I'd guess that the purple is a mix of blue where the electron stream is grounding to the glass, and red where the collector plate is glowing red-hot. This is very not good and you want to trash that tube immediately.

Axes: Fender Custom Shop Strat (Fred) / MIJ Strat (Fralin '54s) / MIJ Tele / Dillion LP (Fralins) / Dot (SD Ants) / PRS: McCarty Brazilian / Custom 22 Rosewood Artist / Archtop II
Rig: -> 535Q wah -> DOD FX56/ProCo RAT -> E13 TBD -> loop { Digitech RDS 3.6, phase inverted { dry -> 3-knob EHX Bad Stone -> ADA Rocket 20}} ->
Mesa Maverick, or GarageBand.
* BC Rich ST3 (SD Custom) -> Boogie Mark IIC+; 2 1x12 EV 12S's
I gave the Maverick to nyrkickazz1, and man, I miss that amp. IT SURVIVED! I have it back now.

Other stuff: a Ric 360/12 in baby blue; an '83 MIJ Squier P-bass; a Martin HD-28V; and now I have a Mesa Mark IV long head too.
__
"Arise, goddess; invest thyself in these, thy shining raiment, and ensconced in Phaeton's chariot float your starréd way to the Liquor Control Board of Ontario."

Rock_A_My_Soul's picture
Providence, Rhode Island
May 2003
11 years ago

Originally posted by *Noodles*
um.... are you sure it was purple?!

that's a bit of an odd colour for tubes / valves to be glowing surely.
:confused:

Now you can understand why I'm so concerned!

-Martin

Quote:

GuitarGeek: Why play guitar when you can talk about it?

A Man, A Plan, A Canal featuring my equipment and songs

Fender Jazzmaster/Univox Rickenbacker 360-12 copy/reissue Danelectro U2 -> Zoom Ultra Fuzz, Boss TU-2, Ibanez DE-7, Digitech PDS 2000, Boss DD-20 -> Fender Ultimate Stereo Chorus/Gibson Discoverer

Rock_A_My_Soul's picture
Providence, Rhode Island
May 2003
11 years ago

Originally posted by ikkyu2
That tube's dead. You shouldn't play the amp any more until you replace it.

I'd guess that the purple is a mix of blue where the electron stream is grounding to the glass, and red where the collector plate is glowing red-hot. This is very not good and you want to trash that tube immediately.

Good to know that I wasn't hallucinating, and that there's a logical reason for everything. When you say trash it, do you mean I should take it out and throw it out myself or just let the repair guy deal with it?

-Martin

Quote:

GuitarGeek: Why play guitar when you can talk about it?

A Man, A Plan, A Canal featuring my equipment and songs

Fender Jazzmaster/Univox Rickenbacker 360-12 copy/reissue Danelectro U2 -> Zoom Ultra Fuzz, Boss TU-2, Ibanez DE-7, Digitech PDS 2000, Boss DD-20 -> Fender Ultimate Stereo Chorus/Gibson Discoverer

Rock_A_My_Soul's picture
Providence, Rhode Island
May 2003
11 years ago

Originally posted by nobody
Dude, I wouldn't use the amp until you get someone to look at it. You risk blowing a tube or a transformer.

But the important thing is to make sure the plates inside the tubes aren't glowing cherry red.

I unplugged it and am staying far, far away from it. Not to mention that it wouldn't work if I tried. What would the plates glowing cherry red mean?

-Martin

Quote:

GuitarGeek: Why play guitar when you can talk about it?

A Man, A Plan, A Canal featuring my equipment and songs

Fender Jazzmaster/Univox Rickenbacker 360-12 copy/reissue Danelectro U2 -> Zoom Ultra Fuzz, Boss TU-2, Ibanez DE-7, Digitech PDS 2000, Boss DD-20 -> Fender Ultimate Stereo Chorus/Gibson Discoverer

nobody's picture
Chicago, IL
Sep 2002
4 years ago

Originally posted by Rock A My Soul
I unplugged it and am staying far, far away from it. Not to mention that it wouldn't work if I tried. What would the plates glowing cherry red mean?

To much current going to the plates(bias is too hot) which leads to overheating and then death of the tube and/or other components.

"Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blind-folded fear."
- Thomas Jefferson

Rock_A_My_Soul's picture
Providence, Rhode Island
May 2003
11 years ago

A little history about the amp:

My dad found it in the trash, and I took it in to the shop where I usually take my pedals. It took 3 MONTHS for him to fix it. The reason it took so long is that there were a few busted capacitators that weren't made anymore so he had to order new ones plus modify it to accept them, etc etc. So it's a possibility that he messed something up and made it so that the tubes burn out faster. I got it back in October with brand-new tubes in it, and I know that tubes aren't supposed to be changed in 2 months, so there must be something wrong.

Also, the tubes are EH tubes, do those suck?

-Martin

Quote:

GuitarGeek: Why play guitar when you can talk about it?

A Man, A Plan, A Canal featuring my equipment and songs

Fender Jazzmaster/Univox Rickenbacker 360-12 copy/reissue Danelectro U2 -> Zoom Ultra Fuzz, Boss TU-2, Ibanez DE-7, Digitech PDS 2000, Boss DD-20 -> Fender Ultimate Stereo Chorus/Gibson Discoverer

nobody's picture
Chicago, IL
Sep 2002
4 years ago

Originally posted by Rock A My Soul
Also, the tubes are EH tubes, do those suck?

No, EH tubes are quite good.

"Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blind-folded fear."
- Thomas Jefferson