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PostPosted: Mon Apr 03, 2017 8:58 am 
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Mark II

Joined: Mon Aug 17, 2009 9:28 am
Posts: 99
I rarely play my mini rec - I usually carry at as a backup to my main rig in case something would go down at a show. That said periodically I will fire it up and make sure all is in good order.

Yesterday was that day. The low string E string, and in particularly the lower pitch notes on that string were making a very audible overtone - I noticed it on the Clean channel. I didn't think to try it on the second voice of that channel, and I didn't notice it on the vintage gain channel, although the gain could have been covering it.

What I heard was a harmonic overtone, almost like a fifth down.

Does that sound like a power tube, or preamp tube? Any suggestions would be very helpful!!!

Thanks in advance

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PostPosted: Mon Apr 03, 2017 7:55 pm 
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Mark IV

Joined: Thu Aug 15, 2013 12:20 am
Posts: 646
Location: Tucson, AZ
It could be. Check the manual for the tubes used by the clean channel. You might also check if your pickup is too close to the strings. That can also affect the harmonics and cause strings to sound out of tune.

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PostPosted: Tue Apr 04, 2017 6:54 am 
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Mark II

Joined: Thu Jul 07, 2016 1:18 pm
Posts: 77
I had a similar thing with my F50, changing the pre amp tubes sorted it out.


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PostPosted: Tue Apr 04, 2017 6:25 pm 
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Mark II

Joined: Mon Aug 17, 2009 9:28 am
Posts: 99
Thanks - will try the pre-amp tube(s) first.

BTW - ruled out guitar because I tested that with my Electra-Dyne head.

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PostPosted: Sat Apr 08, 2017 11:37 am 
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Mark II

Joined: Mon Aug 17, 2009 9:28 am
Posts: 99
Well, it must be something other than tubes - I swapped in a new pre-amp tube, one by one, no change. Then a new set of EL84's - no change. Different speaker cabinet, no change and different guitar, no change....

Trip to the tech is in order now!

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Mini Rectifier Head
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EBMM Guitars


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PostPosted: Wed Apr 26, 2017 10:47 am 
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Mark II

Joined: Mon Aug 17, 2009 9:28 am
Posts: 99
Back at this trouble shooting with an important discovery: it is fine when I switch the effect loop off. I have replaced V5 with several brand new tubes, no difference. Any ideas what would cause that?

https://soundcloud.com/mikekeller-2/mini-rec

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PostPosted: Wed Apr 26, 2017 2:15 pm 
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Mark II

Joined: Mon Aug 17, 2009 9:28 am
Posts: 99
Time to eat crow....

Thanks to some assistance from Mesa - the amp is perfectly fine. I had the clean channel gain turned up pretty high (in an effort to get a small amount of grit) with the bass up to far. Backing them off and amp is behaving as it should.

Thank you

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PostPosted: Thu Apr 27, 2017 5:20 am 
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Single Recto

Joined: Mon Mar 09, 2009 5:16 am
Posts: 1258
mikeller wrote:
Time to eat crow....

Thanks to some assistance from Mesa - the amp is perfectly fine. I had the clean channel gain turned up pretty high (in an effort to get a small amount of grit) with the bass up to far. Backing them off and amp is behaving as it should.

Thank you


That can definitely happen on any Mesas as far as I know


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PostPosted: Thu Apr 27, 2017 9:26 am 
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Mark II

Joined: Wed Aug 04, 2010 10:32 am
Posts: 85
Location: New Jersey, USA
Not just on mesa amps. Turning up the bass all the way on any amp with gain up high can cause strange things to happen. Sounds like it was being overdriven a bit by the bass, so extra harmonics were generated.

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PostPosted: Sat Apr 29, 2017 11:05 pm 
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Mark III

Joined: Thu Feb 07, 2013 10:45 pm
Posts: 223
:shock: That is really weird, yet fascinating! It makes me realize how little I actually know about amplifiers and what they are capable of doing, for better or worse. :lol:


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