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On my Spider amp One of the valve tubes was glowing red before it stopped working

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Hi,

Check for power supply fuse, if some of the amp tubes is shorted the fuse will be opened, please add more info to help better.

Posted on Nov 06, 2013

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My line 6 spider mk 11 starts making a cracking noise about 50-60 seconds after i turn it on, then loud fuzz noise- whats wrong plz help


Disable ALL digital settings....problem gone? If not, with tube guards and/or shileds removed try lightly tapping on each tube (one at a time). Does your amp go crazy while tapping one particular tube? If yes then it is new tube time.

Oct 18, 2012 | Line 6 Spider Valve 112 MkII 40 watt 1x12...

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I seem to always get a static sound out of my Line 6 Spider Iii below 9 o'clock on the volume knob. Not only is it staticy, but the volume jumps all around and goes from whisper quite 1 second to house...


It sounds like you have a dirty pot (the volume control). Unfortunately the only way to clean the pot is to open the amp up and try to spray some Servisol Super 10 in through the small opening in the pot case.

WARNING: Tube amps contain lethal voltages even when unplugged! If you are not an experienced service engineer then take it to someone who is! It is a pretty common task in guitar amps so shouldn't cost too much.

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All the lights on my line 6 spider valve 112 are no longer working except for the power light. what would cause this and how can i fix it?


Unfortuently for you i can already tell you that is going to be your digital board. notorious for going bad in these things. line 6 has a flat rate to repair them but wont release parts. sorry man i've been fighting that battle since these were released.

Aug 30, 2011 | Line 6 Bogner Spider Iii Valve Tube Combo...

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Hello, I own a hotrod deluxe. I take great care for it and never move it. Normally on the clean channel, the volume is regulated by the volume and the master. Today the amp sounded only half as loud as...


Do you turn on standby every time and wait for the tubes to heat up first? If you don't, it can severely damage the tubes.
But a common cause of this could be just old tubes. Like any other piece of technology, tubes get old. If you like to play your amp LOUD then they wear out a lot quicker. You have to replace tubes every now and then. Because I'm not there to check out your amp, I can't give you an exact answer but it sounds like that's the problem. This isn't always a bad thing. You can make the sound of your amp exponentially better with nicer, new tubes. Your amp has 12AX7 tubes. Very common tubes to use actually. I'm not sure what kind of music you play, I'm assuming mostly rock and blues. But here is a list of tubes and reviews on them.
http://thetubestore.com/12ax7review.html
This is how to replace a tube:
http://www.ehow.com/video_4438285_change-pre_amp-tubes-guitar-amps.html
Upkeep on a tube amp:
http://www.ehow.com/video_4438295_replace-tubes-guitar-amp.html
A note he doesn't make in the video is to dust out your amp. I use the compressed dust spray for the inside of computers.
So overall, stop turning up your amp to 11, make sure it's well ventilated and dust it out from time to time. Hope this helped.

Jun 18, 2011 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

My Epi valve jr v3 burns up jj el84 tubes, but the solvteks work fine...is it the amp or the tubes?


Check the bias on the tubes! Some brands can run with bias set wrong. Also some amps have 4 output tubes and people don't know that MATCHED pairs have to be seperated to each side of center of the group of four tubes.
You probably only have a single EL84 tube in your unit.
I could not find the schematic for this unit... IF the plates of the EL84 are coloring, the bias is set wrong. The plates should remain BLACK and not coloring to dull red or orange. Telling if the tubes are "burned up" can only be done with a tube checker or electronic test equipment or by seeing a bright purple glow between the elements.
Now this is supposedly only a 5 Watt unit so that means it is for LOW volume practice only... If you overdrive this small amp you can PROBABLY burn almost any tubes you put in it. The sound you can expect out of this will not be louder than most of the consumer boom boxes at full volume.
If you overdrive and "flattop" the unit the power tube will overheat and fail... this amp runs the tube in "Class A" which makes failure under overdrive more likely than in Class AB or B. I can't go into the engineering details other than to say at volumes above the design the output transformer will saturate and the tube will have to dissipate way above its ratings.

Feb 12, 2011 | Epiphone Valve Junior Tube Amplifier Head

1 Answer

LOW POWER AND CRAKLING


Chances are that one of your tubes (valves) has failed.
If your amp is still in manufacturers warranty take it back to the place where you bought it.
Otherwise you need to identify which tube has gone and replace it. This will entail gaining access to the inside of the amplifier case. BEWARE this can be VERY DANGEROUS if you don't know what you are doing.
IF IN DOUBT TAKE IT TO A REPAIR SHOP
Always disconnect from the mains electricity supply before dismantling.
Once you have got the case off you will need to plug the amp in again and turn it on - you don't need to plug a guitar in just the mains supply. TAKE GREAT CARE not to touch any metal parts.
Look at each of the valves (there are some on the pre-amp stage behind the front panel as well as on the main amplifier chassis) they should all be glowing a nice bright red colour in the middle if they are healthy.
If any valve is not 'lit up' that will be the faulty one. DO NOT TOUCH IT - apart from the high voltage electricity associated with them valves get very HOT.
Turn the amp off, unplug the mains supply and WAIT at least 10 minutes for it to cool down again. Carefully slip the metal retaining spring off the top of the valve and, gripping it with a tissue or soft cloth, gently pull it out with a slight rocking motion. Carefully note down all the numbers and letters on the valve to identify the correct replacement. There are literally hundreds of different valves - putting the wrong one in may cause further damage to the amp.

Feb 02, 2011 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

My deville has just stopped producing any sound what soever. All the tubes glow and the red power light is on but no sound. I have tapped the sides of all the tubes and they all register a sound except the...


The first thing i would do is not leave it on in this way for too long. You could blow out a very expensive Transformer if its a faulty speaker. The worst thing you could do to a TUBE amp is run it without a speaker . I would test the speaker first. Just remove the wires going to it. And connect the speaker to either a car stereo or house system at low volume very low. And see what you get. if it works ? Good! Now check your guitar chord/wire. Try different ones try different guitars. If that doesn't work . Look into the input jack on the instrument input hack on the amp.. They do come loose off the board.Either get a new input jack or resolder the old one. if you only have one guitar look at the guitar output jack. Loose wiring on the guitar could cause this also. Dirty In and out put jacks could cause this. A pencil with Very fine sand paper wrapped around it will clean a dirty input/output jack. Try these things. Just remember poking around your amp is Dangerous. The electrical components hold a charge even unplugged that can kill you. No joke..

Dec 26, 2010 | Fender Hot Rod Deluxe Guitar Combo...

2 Answers

I have a buzzing noise coming from my Marshall AVT100. It is present on all the channels. Is it likely to be caused by the valve? The valve inside is made by Electro Harmonix and it was made in Russia....


okay so buzzing noise. i have seen this once before. the extension cord feeding a power strip with two amps plugged in and powered on off of a low amp electrical outlet with fluorescent lights overhead.......try running only one power unit off of the electrical outlet you are using, just one straight into the wall with the lights out. if you still hear it i wonder if the output transformer is starting to go south. if you listen close sometimes you can hear the buzz of a transformer powered on, example: you can hear the buzz of a power transformer on a power pole in peak hours. tubes usually make hisssing, crackling type noises. next would be to tap on the tubes while in play with an orange stick or pencil eraser to listen for microphics or the tapping itself thru the speakers. if you hear with out a doubt change them.

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1 Answer

Crate V16 1X12 Palomino loses power, guitarist robbed of fame


Start easy. You could have a bad power switch. Do you get any kind of indication of any life at all, like tube filiments or front panel indicators? If the fuse is blown you have a fault that is drawing excess current, in which case you can check the rectifiers that create your bias voltages, yank the output tubes to see if they have an internal short, less likely would be a shorted filter capacitor (although I have seen it). You could also have a bias problem on the output tubes that causes them to draw excess current and likely makes the tube(s) glow bright red before popping the fuse. If this is the case, look for shorted or leaky coupling capacitors and burned bias resistors, or maybe just a tube with internal shorts, and you will likely have junk tubes as a bonus (they don't take kindly to glowing bright red- meaning a glow that is far more intense than the soft glow of the filiments). If the fix gets more involved than all of this, give me your email addy and we can get hard core.

May 16, 2009 | Crate Music

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