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Post subject: EVH 5150 PROBLEMS!! HELP!!
Posted: Sun Apr 29, 2018 11:43 am
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Alright everybody, I need your help...
I own a 5150 iii 2x12 combo named Eva. I love her so much, but she has some problems which seem to be getting worse over time. I'll list the issues below, and record a video showing the hum issue. Some facts about her, she has been gigged a lot, and has definitely seen her share of road life. I try to take care of her as best as possible. She has stock tubes, minus one 12ax7 which was replaced with a sovtec mid gig.

Symptoms:
-Extremely bad hum, most prevalent on gain channels but still exists on clean channel. This happens even when not guitars plugged in or volume is off. This hum is over half as loud as the actual guitar on the high gain channels, and it's so bad I can't play live with the amp anymore because it's too dang noisy during quiet parts of the song. This also produces unreal feedback (the good kind?) during playing, but even when my hands dampen the strings it still feedbacks unless the volumes all the way down.
I'll post a video of the hum at the bottom of this post.

-When playing on gain channels, sometimes it will randomly switch to the clean channel. Sometimes this will happen 7-8 times within an hour, sometimes doesn't happen at all.

-Slight volume drop when playing occasionally. This only lasts maybe 1/6 of a second but is sure annoying. Only happens every once in a while.

-Loud pop when turning amp onto standby and it's on the gain channel.

What the heck do you think this all is? One of my suspicions is that it needs a retube. What do you think? Any advice is welcome! I'll answer any questions too

YouTube video I made of the hum:
https://youtu.be/7b8lhFdlD3Y


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Post subject: Re: EVH 5150 PROBLEMS!! HELP!!
Posted: Tue May 01, 2018 1:49 am
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Joined: Fri Feb 05, 2010 4:31 am
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Location: Province de Québec, Canada
It could be a noisy preamp tube (s ) 12XX7, not power tubes


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Post subject: Re: EVH 5150 PROBLEMS!! HELP!!
Posted: Wed May 23, 2018 8:49 am
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Saw the video, I'm no expert, but I have had problems with microphonic tubes, and that's what it sounds like to me. Coupled with a grounding issue? If you are getting high-end feedback, power downs etc. Then I would suggest retubing the whole lamp just to be on the safe side. And I would do it with the exact same tubes it came with. If you still have that problem, then there could be a cold solder joint going bad.?


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