Mark M's EA Boost

[sixstringphil]

Anyone ever built one of these? It's the preamp section of the ROG EA Tremolo. I just finished one and was debating on putting it in a box. The only other boost I have to compare it to is the beginner NPN boost. Anyone else tried it?

[squidsquad]

I've made 3 EA Trems...and as is usual for FETs...each sounded a bit different. 
But when it's *right*...it RAWKS!
I changed the switching so that the boost is always on...even when the trem is off.
So...I'd suggest a socket & try a bunch...using a trimmer for bias.

[squidsquad]

Er....ya know...ain't that front end a MOSFET designed by Gez? 
I may have posted before using the brain....DUH! 
The boost sounds great.
It's the trem that varies because of the JFET.

[squidsquad]

And now (sheesh...I swear I'm not under the influence!)...to the point:  I've not made Gus's boost...but I may eventually because I really respect him.  A MOSFET boost is very clean...and has a *sparkle* to it...because the high impedence lets ALL your tone come thru.
An LPB has a lower impedence...so it darkens your tone somewhat.  Jack's mini-booster has a some *hair* to it.  Bottom line: each has it's own *personality* and only YOUR ears can decide what you prefer.

[sixstringphil]

Yes, Gez's mosfet design is much cleaner than the original EA circuit. I've only tried 2N2222s in the NPN, and it does break up a little, but it's nice.
I like to use my tremolo after comps & distortions, so the EA in my board is internally adjusted to a non-boosted output.