My Orange OR15 head just crapped out. Need help
- Thread starter blakejcan
- Start date
crusty philtrum
Vintageologist
Re: My Orange OR15 head just crapped out. Need help
Speaker ? Although i'll assume you have checked that, and substitued every sonic link (guitar, cable on the input side, speaker lead, speaker cab on the output side). Does that amp feature a standby switch ? If you turn all the amps controls up without playing, can you hear any hiss or humm through the speaker ?
When an amp itself seems to be the culprit, but the power light comes on and the tubes glow, that can often mean there is a break in the signal path somewhere in the amp's circuitry. (some amps may have a secondary fuse, in the high-DC voltage line ... if that fuse blows, there will be no sound, but the heaters and power lamp will still light up). If the amp has an effects loop, you can try plugging a jack plug in and out of the sockets a few times, or even linking the loop output and return input with a short guitar cable.
Speaker ? Although i'll assume you have checked that, and substitued every sonic link (guitar, cable on the input side, speaker lead, speaker cab on the output side). Does that amp feature a standby switch ? If you turn all the amps controls up without playing, can you hear any hiss or humm through the speaker ?
When an amp itself seems to be the culprit, but the power light comes on and the tubes glow, that can often mean there is a break in the signal path somewhere in the amp's circuitry. (some amps may have a secondary fuse, in the high-DC voltage line ... if that fuse blows, there will be no sound, but the heaters and power lamp will still light up). If the amp has an effects loop, you can try plugging a jack plug in and out of the sockets a few times, or even linking the loop output and return input with a short guitar cable.
Gearjoneser
Gear Ho
Re: My Orange OR15 head just crapped out. Need help
What Crusty said. I'd start by swapping tubes. The amp is solidly made, but there's 4 tubes that can fail and shut it down, whether they're glowing or not.
What Crusty said. I'd start by swapping tubes. The amp is solidly made, but there's 4 tubes that can fail and shut it down, whether they're glowing or not.
blakejcan
Well-known member
Re: My Orange OR15 head just crapped out. Need help
Jeff-yes, still running same tubes. Reaching in there freaks me out
Tried new cable, guitar, speaker. Nothing.
I'm guessing something blew or a tube got unseated?
Jeff-yes, still running same tubes. Reaching in there freaks me out
Tried new cable, guitar, speaker. Nothing.
I'm guessing something blew or a tube got unseated?
JeffB
Let it B
Re: My Orange OR15 head just crapped out. Need help
Tubes and fuses are the first things to check/replace...IME, JJ tubes cook easily. I have had to replace several el84s and ecc83s' in 3 different amps.
If you are not comfortable doing that, take it to a tech.
Tubes and fuses are the first things to check/replace...IME, JJ tubes cook easily. I have had to replace several el84s and ecc83s' in 3 different amps.
If you are not comfortable doing that, take it to a tech.
GoldenVulture
Braindeadologist
Re: My Orange OR15 head just crapped out. Need help
Anything from nothing obvious to blackened badly inside or all white inside [ if it's been cracked and the gas has escaped ]. Maybe a melted socket [ this happened to me long ago ]
Anything from nothing obvious to blackened badly inside or all white inside [ if it's been cracked and the gas has escaped ]. Maybe a melted socket [ this happened to me long ago ]
Demanic
PenultimateTone Member
Re: My Orange OR15 head just crapped out. Need help
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Gas? I always thought they were vacuum tubes.
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crusty philtrum
Vintageologist
Re: My Orange OR15 head just crapped out. Need help
He probably meant that the nothingness may have escaped.
He probably meant that the nothingness may have escaped.
Demanic
PenultimateTone Member
Re: My Orange OR15 head just crapped out. Need help
Well I have seen a tube that eventually failed first develop a purple glow inside which I think indicated air starting to leak into the tube. I think the white powdery residue is the result of filaments vaporizing after this occurs.
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Well I have seen a tube that eventually failed first develop a purple glow inside which I think indicated air starting to leak into the tube. I think the white powdery residue is the result of filaments vaporizing after this occurs.
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Lake Placid Blues
New member
Re: My Orange OR15 head just crapped out. Need help
There are gas filled electron tubes. They are called thyratrons. The gas may be mercury vapor, or helium, hydrogen..... They are used as mechanical actuators in some cases or pulsers for radar and lazer systems and so forth.
There are gas filled electron tubes. They are called thyratrons. The gas may be mercury vapor, or helium, hydrogen..... They are used as mechanical actuators in some cases or pulsers for radar and lazer systems and so forth.
L
Little Pigbacon
Guest
GoldenVulture
Braindeadologist
Re: My Orange OR15 head just crapped out. Need help
-http://www.w8ji.com/vacuum_tubes_and_vaccum_tube_failures.htm -
-http://www.w8ji.com/vacuum_tubes_and_vaccum_tube_failures.htm -
Output tubes regularly glow purple and they are fine.
Rex_Rocker
Well-known member
Re: My Orange OR15 head just crapped out. Need help
The white powdery stuff is the getter flash which is kinda dark silvery/metallic looking when the tube's fine, and it's meant to react with gases which might leak inside the tube and keep the vacuum. If the vacuum's been broken, all of the getter flash has reacted and turned into the white powdery stuff.
The white powdery stuff is the getter flash which is kinda dark silvery/metallic looking when the tube's fine, and it's meant to react with gases which might leak inside the tube and keep the vacuum. If the vacuum's been broken, all of the getter flash has reacted and turned into the white powdery stuff.
JeffB
Let it B
Re: My Orange OR15 head just crapped out. Need help
Ironic question, considering the case of the disappearing spare tubes fiasco....., but do you have any spare el84s?
Ironic question, considering the case of the disappearing spare tubes fiasco....., but do you have any spare el84s?
blakejcan
Well-known member
Re: My Orange OR15 head just crapped out. Need help
Ha! I do not. I'm gonna rab some tho. No biggie
Mullards are in there right now. I liked the sound
What else do people like?
Ha! I do not. I'm gonna rab some tho. No biggie
Mullards are in there right now. I liked the sound
What else do people like?
