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Author Topic: HRM?  (Read 10823 times)
Steven_nl
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« on: April 22, 2008, 09:19:51 PM »
what is it and why would I want one?


(tried a search on TGP but there aren't enough letters)
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jake
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« Reply #1 on: April 23, 2008, 02:08:37 AM »
This from a Dumble newby, H = hot, R = rubber, M = monkey. Where this comes from, no clue. It has to do with seperate internal eq for the lead channel. If my information is correct. I think it is.
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mcinku
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« Reply #2 on: April 23, 2008, 05:58:00 AM »
This was posted on the Ampgarage wiki page...

Hot Rubber Monkey, aka. Hot Rodded Marshall, refers to the post overdrive tone stack which is used to scoop and shape the overdrive tone. This standard FVM (Fender, Marshall, Vox) type tone stack is connected after the final gain stage in the overdrive section of the Dumble style amp. Standard values would be a 500pF treble cap, .022uF mid and bass caps, a 33k slope resistor, 1M bass pot, 20k mid pot and 250k treble pot. It is installed on a small board using trim pots that are "set and forget".

Typical adjustments are done by first setting the bass pot to the point where it just starts adding bottom, setting the mid pot at the 1/2 way point, and the treble pot slightly above the mid point, approx 135k. From this point you can adjust to taste, keeping in mind that these pots are very sensitive and interactive.
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Steven_nl
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« Reply #3 on: April 23, 2008, 07:15:41 AM »
thanks
I guess the charm/character of the ODS is also in it's limitations. A seperate tone control for the OD channel and a reverb would be usefull additions. You'd end up with a different amp though.
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mcinku
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« Reply #4 on: April 23, 2008, 07:55:39 AM »
I'm not an expert but HRM would definitely change the character of OTS...

Just a few comments from the ampgarage.... ( I hope I can do that  :Smiley )

...non-HRM - it is easy to get rich singing sustain. The HRM is less distortion like and much more dependent on touch for overdrive tonality.

...non-HRM is not gritty or buzzy but it is more distorted sounding at lower drive settings - in a good way. One cannot really imitate the other. The non-HRM emphasizes the mid harmonics more. To confuse you even more - Blues gig = non-HRM and Fusion gig = HRM of course this is just MHO.

There is more  but I think those two comments sums it up nicely.
 Wink
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AdrianJ
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« Reply #5 on: April 23, 2008, 11:36:19 AM »
Are Two Rocks based on a HRM or non-HRM Dumble?
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bluegate
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« Reply #6 on: April 23, 2008, 02:58:11 PM »
I would suggest you try the amp first and then decide what to upgrade/change.
Sound is very specific to the user, and you also have new speakers to adjust to.

There are a lot of other simple things to mod if you want to change the sound.
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Steven_nl
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« Reply #7 on: April 23, 2008, 03:11:19 PM »
I'll come over and we can compare :-). Another 8 weeks to go!
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bluegate
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« Reply #8 on: April 23, 2008, 03:12:43 PM »
OK, you're welcome.  Grin
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marinblues
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« Reply #9 on: April 23, 2008, 03:44:38 PM »
I was just listening to Larry Carlton's "Last Nite".

That was all non-HRM.

Us guitarist are awful customers to please.

If the Overtone was an HRM clone, I bet there would posts all over the board saying:

"NIK, WHEN ARE YOU COMING OUT WITH A NON-HRM VERSION (THE ORIGINAL DUMBLE CIRCUIT)??" Cheesy


Marin
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Mondoslug
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« Reply #10 on: April 23, 2008, 05:02:50 PM »
YMMV of course but I can't really see any disadvantage to having some sort of control  & separate EQ on the Overdrive Channel side of the amp.
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marinblues
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« Reply #11 on: April 23, 2008, 05:06:18 PM »
Quote from: Mondoslug on April 23, 2008, 05:02:50 PM
YMMV of course but I can't really see any disadvantage to having some sort of control  & separate EQ on the Overdrive Channel side of the amp.

I hear you, but I don't think that you get that with an HRM either which still has a single EQ stack for both channels.

M.
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Mondoslug
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« Reply #12 on: April 23, 2008, 05:37:20 PM »
Quote from: marinblues on April 23, 2008, 05:06:18 PM
Quote from: Mondoslug on April 23, 2008, 05:02:50 PM
YMMV of course but I can't really see any disadvantage to having some sort of control  & separate EQ on the Overdrive Channel side of the amp.

I hear you, but I don't think that you get that with an HRM either which still has a single EQ stack for both channels.

M.
Okay...I guess it's shared but you get some other shaping of the OD channel with the 3 extra trimpots though...right?
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jzucker
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« Reply #13 on: April 23, 2008, 06:25:57 PM »
Quote from: Mondoslug on April 23, 2008, 05:02:50 PM
YMMV of course but I can't really see any disadvantage to having some sort of control  & separate EQ on the Overdrive Channel side of the amp.

Just remember the fender tone stack is a lossy circuit. So that *IS* a disadvantage...
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Mondoslug
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« Reply #14 on: April 23, 2008, 06:36:48 PM »
I don't know what that means.
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