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Author Topic: MP1 Preamp Tubes for Metal?  (Read 2075 times)

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toilinthedark

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MP1 Preamp Tubes for Metal?
« on: Time Format »

So glad to see this forum back up!
I have an MP1 from way back. Only mod is a factory modded rear jack.
Not that happy with my tone, right now.
Rig: MP1, BBE 822, Mesa Simul-Class 295, Marshall 1960 4x12
I have always found that the BBE is essential with the MP1 to get the big, tight low end that I need for metal.
I have EMG 81's in my guitars and have not found gain to be wanting with the stock MP1.
Tunings - Standard E down to Drop A#
Was interested in modding the MP1, but wanted to start with tubes first. Swapped out the Groove Tubes for Mesa Boogie 12AX7 that I had lying around and the tone improved, but it's still not where I want it.

What I hear right now:
Distortion is fizzy
Power chords sound great, but palm muted notes are really weak. They just die instead of jumping out of the speaker. This is worse on the low string.
Overly compressed distortion
Single note leads don't sing. The sustain is poor and the tone is brittle.

I have been reading a lot about tube recommendations for the MP1 here and other forums. Was looking at the JJ. Was unsure of 83 or 803.
I have also read about making sure the gain rate is at least 110 Mu. How do I make sure a tube has this gain rate?
Thanks!!
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toilinthedark

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Re: MP1 Preamp Tubes for Metal?
« Reply #1 on: Time Format »

I do realize that some of these tonal shortfalls might be best addressed by some mods, but I wanted to start with a good preamp baseline.
The more I read, the more I am leaning to the JJ gold pin 803
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MarshallJMP

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Re: MP1 Preamp Tubes for Metal?
« Reply #2 on: Time Format »

Dougs tubes sells tubes with gain ratings over 110.You won't find these in off the shelf tubes.He doesn't sell the 803 but he has the ECC83S.These are Ruby branded but they are JJ's.

http://www.dougstubes.com/brands/ruby-tubes/ruby-12ax7-acz-high-grade.html
« Last Edit: Time Format by MarshallJMP »
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