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What is the Allen AMp "raw" control?

Mitch Roberts
March 17th, 2003, 10:54 PM
Can anybody explain exactly what the circuit is? Is it something I could do
as a mod to a Fender tube amp? Just curious. :wink:

Doug T.
March 18th, 2003, 01:15 AM
Basically it's a pot to "lift out" the tone stack ... and it gets louder too! I use the one on my Allen Custom quite a bit ... if I'm running a POD into it (no effects loop) I can "lift" the tone stack and coloration of the signal. If I need a little more volume and growl ... it works for that too!

TeleTubby
March 18th, 2003, 02:05 AM
The Fender treble/mid/bass tone stack dumped a lot of signal to ground in order to do its job. That's the reason for the volume change as you use it. The Raw Switch allows you to bypass the tone stack (in varying degrees) and feed the preamp signal right into the power tubes. Of course, your tone pots have less effect on the signal, as you turn the Raw Switch up. David put a Raw Switch on my SF Princeton Reverb, so it can be done, but don't ask me how to do it- 7 states have banned me from owning soldering irons, for that reason I can be of no help to you. :wink:

JDO
March 18th, 2003, 12:27 PM
thanks for asking and answering that question. i've been wondering what it was myself. does anyone know how it's done or is this a david allen secret? that might be a cool thing to add to a homebrew in the future.

mk
March 19th, 2003, 12:05 AM
ah -- I kinda wondered about this, too. I'm really not that crazy about blackface amps with most guitars -- they sound too hifi to me. But if you can dial out the tone stack at will....

Thanks for the info.

Geo
March 19th, 2003, 08:27 PM
Is the Raw Switch just a switch only and just activated from the amp
itself? In other words, is it not done with a foot switch or variable
setting also.
:roll:

Spanky
March 19th, 2003, 09:24 PM
it is a rotary knob just like the volume or any of the tone controls and operates only on the front panel of the amp--a pretty good thought though ! BTW the Encore model has footswitch jacks on the back for the reverb and tremelo and an extension speaker jack--I think all of those are firsts on an Allen amp==correct me if I am wrong please !

TeleTubby
March 20th, 2003, 01:22 AM
David has never put the Raw Switch on a foot pedal because the volume increase can do MAJOR harm to your speakers. It can be that significant.

Spanky, glad you're enjoying that Encore. I will have to get one for myself some day. I did have David install a footswitch for the reverb on my Old Flame in '99, but I don't think he ever made that a feature of any of his amps. So you're probably correct about the footswitching features- just makes me want one even more. :lol:

Smokey
March 20th, 2003, 08:32 AM
Raw. Heh. What a gimmicky name. :lol:

Spanky
March 20th, 2003, 01:02 PM
If ya think about it though it is a very descriptive way of describing what this control does--It gives you a more "raw" uncolored, straight through sound---It fits !
No more gimmicky than half of the boutique pedals out there---Pastrami overdrive indeed :lol:

Mitch Roberts
March 20th, 2003, 01:52 PM
Thanks for the help on this. I'd still love to know how to
wire one up, i.e the value of the pot, where it connects or
bridges the tone stack. Any amp techs wanna jump in on
this? Thanks!

JDO
March 20th, 2003, 05:46 PM
yeah, that's what i was trying to ask earlier. it'd be nice to know the answer to this.

sixpakplayer
April 28th, 2010, 12:55 AM
Dave Allen ;)

go to the source of course
cause hes da horse'
widt the sense.

This is a compliment ya know!

jjmantele
April 28th, 2010, 10:05 PM
I'm pretty sure that it's electrically the same as changing a 10k mid pot to a ~50k (or so) mid pot. By turning the mid control to "50" you remove most of the mid scoop inherent in the typical Fender tone stack. You also boost treble and bass a little more.

I tried a 50k on a homebrew and went with a 25k since it provided plenty of "raw" potential when turned up and the taper/range was more meaningful. They all start at the same scoopage amount when set to min-mids on the dial but end up more "raw" on the max-mid setting if the pot is a higher value.

ThermionicScott
April 28th, 2010, 10:11 PM
LOL, this thread is old enough to be in second grade. :wink:

Wayne Alexander
April 28th, 2010, 11:04 PM
I've built some Allen kits so I know how the raw control works, but it wouldn't feel right for me to tell you how to do it. It's Dave Allen's design, it's up to him whether to tell you how to add it to another amp. Call or email him, he's pretty accessible (look on allenamps.com for his contact info). If he's willing to share how to do it he will.