Einstein Issue - Help?

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I sent this to diezelusa@yahoo.com a few days ago and haven't heard back yet. I'm not being impatient or anything, but I need to get this figured out as soon as possible. This Einstein is my main gigging amp. Can you guys help?

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I have an Einstein that I believe was made in November 2008. I've recently started experiencing an issue. I've done tons of troubleshooting to narrow down the issue, but now I'm not sure what else to try. I've tried different guitars, different cables, preamp tubes, speaker cables, speaker cabs, etc... The only thing I haven't tried are different power tubes, but I don't see how power tubes going bad could cause this issue. I don't think they're the problem.

What happens is that the amount of gain on the amp increases two or three times and the amp squeels like a pig when I roll up my guitar volume. I've noticed that most of the time if I pull the guitar cable out of the amp, then plug it back it, the amp seems to correct itself.

When it's in this super high gain squeel mode, I can tap on ANY preamp tube and it sounds like they're all microphonic. Heck, even tapping on the chassis itself sounds microphonic. But when the amp isn't experiencing this problem, the preamp tubes don't sound microphonic. I've swapped them several times and that didn't fix the issue.

I just noticed today that when the amp is doing this super high gain squeel stuff, I rolled the preamp gain on Channel 2 all the way off and there was still sound coming out of the guitar/amp. It almost seems like it's chaining both channels together or something when this problem happens. It's happened several times to me now over the past month. I can pretty much count on it happening at least one time anytime I play the amp, which unfortunately, has included gigs.

I think there's something in the preamp going out on it (or maybe the input jack, channel select switch, etc...?)

I'm in the middle of the USA. Are there any Diezel repair centers around here or how would I get something like this fixed? Will I need to ship it somewhere for the repair? I still have the original box and stuff, so I'm good there. I just need to get this fixed and I think I've ruled out everything external to the amp. I'm pretty sure it's an issue with the amp itself.

Any help is appreciated.
 
Thanks Terry. I just left a voice message for you to call me back when you can.

Im up for more troubleshooting too. Does anyone have any ideas what could cause this? I think I've pretty much ruled out everything, but maybe I forgot something?
 
Terry, thanks for the call back and suggestions. I messed with it more tonight and now I'm wondering if it is a preamp tube and I somehow missed that during my swapping and other troubleshooting? Not sure. I put the stock preamp tubes back in the amp and after 30 minutes or so, it did it again. While it was doing it, I figured out that it only affects Channel 2. That points to V2. I swapped that one out again and played for a little while more and it didn't do it. But, I'm not sure I played long enough the second time to see.

I'll keep plugging away to try and narrow it down. I would LOVE it if I could fix this easily myself with tubes rather than to send it in for repair! I'll report back.
 
Not that anyone cares, but nevermind my last post. The Einstein did that high gain squeel thing again last night. One time it only affected Channel 2, but last night it affected both channels. I can roll the preamp gain all the way down on both channels and there's still a super high gain tone coming from the amp when I play.

Imagine running 5 OD pedals cranked up together. That's what it sounds like. You tap the amp chassis and you can hear it coming out of the speakers (microphonic sound.)

Something's wrong with it and I have no doubt Diezel USA will take care of me, but it does suck having to deal with it.

Terry, I'll try another thing or two this week then give you another call. Looks like she'll be coming in for service.
 
question":11b7a5ww said:
Not that anyone cares, but nevermind my last post. The Einstein did that high gain squeel thing again last night. One time it only affected Channel 2, but last night it affected both channels. I can roll the preamp gain all the way down on both channels and there's still a super high gain tone coming from the amp when I play.

Imagine running 5 OD pedals cranked up together. That's what it sounds like. You tap the amp chassis and you can hear it coming out of the speakers (microphonic sound.)

Something's wrong with it and I have no doubt Diezel USA will take care of me, but it does suck having to deal with it.

Terry, I'll try another thing or two this week then give you another call. Looks like she'll be coming in for service.
Click to expand...

Not that anyone cares?? C'mon man... We're all Diezel owners and have interest in others experiences whether they're good or bad. I'm sorry for you that you're having such an issue with what is a fantastic amp. It does indeed stink to have to send her in for repair, but trust me Terry is the greatest and he'll get things sorted straight away. Hopefully it'll be something really quick and easy. Keep us posted!!
 
studiojig":eryq53ab said:
Not that anyone cares?? C'mon man... We're all Diezel owners and have interest in others experiences whether they're good or bad. I'm sorry for you that you're having such an issue with what is a fantastic amp. It does indeed stink to have to send her in for repair, but trust me Terry is the greatest and he'll get things sorted straight away. Hopefully it'll be something really quick and easy. Keep us posted!!
Click to expand...

:lol: :LOL:

Thanks. I'm sure they'll get me all fixed up, so I'm not really worried about that. It just kinda sucks to have to send it in. I'm not saying anything bad about Diezel quality or ANYTHING like that, though. Just that this is my main gigging amp. Looks like I'll have to use another amp until I get the figured out.
 
question":xsue69qp said:
studiojig":xsue69qp said:
Not that anyone cares?? C'mon man... We're all Diezel owners and have interest in others experiences whether they're good or bad. I'm sorry for you that you're having such an issue with what is a fantastic amp. It does indeed stink to have to send her in for repair, but trust me Terry is the greatest and he'll get things sorted straight away. Hopefully it'll be something really quick and easy. Keep us posted!!
Click to expand...

:lol: :LOL:

Thanks. I'm sure they'll get me all fixed up, so I'm not really worried about that. It just kinda sucks to have to send it in. I'm not saying anything bad about Diezel quality or ANYTHING like that, though. Just that this is my main gigging amp. Looks like I'll have to use another amp until I get the figured out.
Click to expand...

VH4 :thumbsup: ;)
 
question":38op4gqv said:
I sent this to diezelusa@yahoo.com a few days ago and haven't heard back yet. I'm not being impatient or anything, but I need to get this figured out as soon as possible. This Einstein is my main gigging amp. Can you guys help?

--------------------

I have an Einstein that I believe was made in November 2008. I've recently started experiencing an issue. I've done tons of troubleshooting to narrow down the issue, but now I'm not sure what else to try. I've tried different guitars, different cables, preamp tubes, speaker cables, speaker cabs, etc... The only thing I haven't tried are different power tubes, but I don't see how power tubes going bad could cause this issue. I don't think they're the problem.

What happens is that the amount of gain on the amp increases two or three times and the amp squeels like a pig when I roll up my guitar volume. I've noticed that most of the time if I pull the guitar cable out of the amp, then plug it back it, the amp seems to correct itself.

When it's in this super high gain squeel mode, I can tap on ANY preamp tube and it sounds like they're all microphonic. Heck, even tapping on the chassis itself sounds microphonic. But when the amp isn't experiencing this problem, the preamp tubes don't sound microphonic. I've swapped them several times and that didn't fix the issue.

I just noticed today that when the amp is doing this super high gain squeel stuff, I rolled the preamp gain on Channel 2 all the way off and there was still sound coming out of the guitar/amp. It almost seems like it's chaining both channels together or something when this problem happens. It's happened several times to me now over the past month. I can pretty much count on it happening at least one time anytime I play the amp, which unfortunately, has included gigs.

I think there's something in the preamp going out on it (or maybe the input jack, channel select switch, etc...?)

I'm in the middle of the USA. Are there any Diezel repair centers around here or how would I get something like this fixed? Will I need to ship it somewhere for the repair? I still have the original box and stuff, so I'm good there. I just need to get this fixed and I think I've ruled out everything external to the amp. I'm pretty sure it's an issue with the amp itself.

Any help is appreciated.
Click to expand...

V1 or 22µ caps
 
Peter Diezel":1bzey4d5 said:
V1 or 22µ caps
Click to expand...

Thanks Peter. Out of the things I can rule out myself, the only things I didn't mess with are the power tubes. But I can't see them causing something weird like this, so I never pursued that.

I think I'll give Terry a call tomorrow and get this Einstein to him for repair. I wish I knew how to check the caps myself. I do have a multi-meter, but that's no good without the knowledge. :)

I take it you've seen something like this before? I don't mean that it's an issue with Einstein amps, I just mean in general when learning how to build amps and stuff. It's weird that when I turn the channel gains down all the way, there's still a scorching screaming high gain squeely tone.
 
Duolos":3ui525zj said:
It will heal anything that ails ya... ;)
Click to expand...

:lol: :LOL:

Please let me know when you guys figure out the problem with my Einstein! I can't wait to get it back. :)
 
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