I did this years ago. I’m surprised Fender didn’t incorporate this in the seventies, mind you it took them forever to put a five way switch into a Strat as standard equipment.
Getting more mids from a JCM-800 preamp?
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Re: Getting more mids from a JCM-800 preamp?
Yours Sincerely
Mark Abbott
Mark Abbott
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Re: Getting more mids from a JCM-800 preamp?
For a Strat I'd day the main goal should be to reduce the high mid emphasis early in the circuit. As others have said, a 2n2 cap on the treble peaker instead of 470pF (Soldano style) would go a long way. If it has a .68uF on V2a (Cathode follower driver) then up that to a multiple uF cap.
I'd probably leave the .68uF on the input stage, but it's worth experimenting with a slightly bigger cap (1 to 2.2uF).
If the first coupling cap is smaller than 22nF (some are), up that to 22nF.
A depth control is typically used to increase low end, but it also has a big effect on low mids. Turning down Bass but increasing Depth gives a nice full tone.
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Re: Getting more mids from a JCM-800 preamp?
Use a variable slope control and lower treble setting when at 68-82k. 100k pot with a 33k stop gets you from annoying JMP to almost Dumble.
Counter-intuitive, but righteous. 82k is my favorite slope value.
Parallel mid control divorces the interaction of the BT controls. The bass @7 and the mids where it sounds great. That might end at treble on 3-4 and pres in the middle or lower. It is also a bit magical.
Counter-intuitive, but righteous. 82k is my favorite slope value.
Parallel mid control divorces the interaction of the BT controls. The bass @7 and the mids where it sounds great. That might end at treble on 3-4 and pres in the middle or lower. It is also a bit magical.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.
Re: Getting more mids from a JCM-800 preamp?
Thanks for your advice Miles, I assume there is an increase in gain as well?Reeltarded wrote: ↑Sun Feb 02, 2025 6:06 pm Use a variable slope control and lower treble setting when at 68-82k. 100k pot with a 33k stop gets you from annoying JMP to almost Dumble.
Counter-intuitive, but righteous. 82k is my favorite slope value.
Parallel mid control divorces the interaction of the BT controls. The bass @7 and the mids where it sounds great. That might end at treble on 3-4 and pres in the middle or lower. It is also a bit magical.
Yours Sincerely
Mark Abbott
Mark Abbott
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Re: Getting more mids from a JCM-800 preamp?
Not real. Only because of the interaction vs new curve you set with controls.
Signatures have a 255 character limit that I could abuse, but I am not Cecil B. DeMille.