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Author Topic: Question about HRM Bluesmaster internal trimmers  (Read 7441 times)
Steve73
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« on: August 15, 2010, 01:36:02 AM »
Hi guys,

I just got an HRM 100w Bluesmaster and I am just starting to get it tuned. Do the internal trimmers only function in the circuit when the PAB is on? Or do they work on the OD channel regardless if the PAB is on or not?

Also, would a common way to set up an HRM be to get a clean sound you are happy with and then tweak the OD/PAB via the internal trimmers to get the OD happening?

Thanks!!  Grin
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JD0x0
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« Reply #1 on: August 15, 2010, 02:56:34 AM »
HRM is always on if the OD is engaged. The tonestack is not usually bypassable. PAB only works on the clean channel's preamp but will affect the OD since both channels cascade.
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Steve73
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« Reply #2 on: August 15, 2010, 08:39:02 AM »
Perfect, thanks for the info, very helpful.
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boldaslove6789
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« Reply #3 on: August 15, 2010, 02:15:47 PM »
Steve,

 Don't want to deviate but: I would recommend giving the amp some burn in time before you start tweaking trimmers. The dynamics and feel of the amp will most likely change after burn in and you won't have a starting point if you change them now. Of course IMO only.....
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Steve73
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« Reply #4 on: August 15, 2010, 08:47:24 PM »
No worries, thanks for the recommendation. I actually bought the amp used so I am assuming it's had a bit of burn in time. The clean channel already sounds a lot like a great blackface Fender Twin I once owned!

Also, have any of you moved the HRM controls to pots on the outside of the back of the chassis?
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boldaslove6789
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« Reply #5 on: August 16, 2010, 01:33:12 AM »
 This has been discussed quite a bit. Once you find your amps sweet spot with the HRM tonestack you will most likely not want to tweak it after that. Having the trimmers on the back is really not worth it.

 Although I'm not saying it can't be done, who knows you might like the feature. There are probably far more useful tone shaping Dumble mods out there that you might find useful.

Examples I've heard of recently on the net......

(( Of course I am not suggesting any of these mods if you have no formal knowledge of tube amps, they're are dangerous voltages inside )) 

HRM lift
 
 Local Negative Feedback switch

 Footswitchable FET w/ a trimmer in place of the the Hi input. Implemented on a few Two-Rocks and most notably the Steel String Singer.

 Vox style cut control( instead of a precence control ala two-rock/Brown-Note Blue Monkey )
 
 And there is probably a ton more mods that can be implemented on the D-style platform that have been discussed to great lengths on The Amp garage and other tube amp builders Forums
« Last Edit: August 16, 2010, 01:35:29 AM by boldaslove6789 » Logged
-Greg D. Clark

Stop searching for tone, INVENT IT!

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bluesfendermanblues
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« Reply #6 on: August 16, 2010, 06:36:45 AM »
Quote from: Steve73 on August 15, 2010, 08:47:24 PM
No worries, thanks for the recommendation. I actually bought the amp used so I am assuming it's had a bit of burn in time. The clean channel already sounds a lot like a great blackface Fender Twin I once owned!

Also, have any of you moved the HRM controls to pots on the outside of the back of the chassis?

I've moved the trimmers to post on the bottom of the chassis. What I found is the once you get the trimmers dialed in (especially the bass trim) you dont want to touch them. In fact I'm going to move back to trimmers, set to the same current setting as the pots.

I found the setting the trims/pots so sound as closely to a NON HRM as possible is the deal. On my amp the bass pot is barely on, its at the beginning of where you can hear the bass coming on. The mid is around 11 o'clock and the treble is around noon.

If you like the sound of your amp as is, Don't mess with the trimmers, or at least make a pencil mark on the trimmers to to indicate the current settings, before you start dialing them.

I agree with

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Nairbr
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« Reply #7 on: August 16, 2010, 10:28:08 AM »
Quote from: Steve73 on August 15, 2010, 08:47:24 PM
at least make a pencil mark on the trimmers to to indicate the current settings, before you start dialing them.




I wish I had done that before I started messing around with them
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Tone Control
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« Reply #8 on: September 05, 2010, 06:25:25 PM »
Spend a few days getting the clean tone right with your main guitar.
Then tweak the OD / HRM so that it works well without changing the clean settings

For me this means OD knobs about vertical and OD trim halfway, and HRM trim dialling treble down to 1/10
Then the OD switch is not a night/day contrast, but just pushes the amp into a nice drive
PAB is too big a jump though I think

Since then
My problem with the BM is that it's too dark with bright off and too bright with it on (with no OD).
I usually set presence to 2/10 on all my amps.
Solution for me is dial bass down a little, and set presence to 7/10, probably need to set the HRM treble trimmer lower still
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Dr Tone Control, Strats mostly, prefer saturated clean tones, a little OD sometimes
BM50, JTM45, 36w EF86, DZ30, Expression, + non-Ceriatones (Matchless, Victoria, Wienbrock)
Just started with pedals a little after a 10 year purist spell, but usually just delay
Steve73
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« Reply #9 on: September 06, 2010, 07:41:24 PM »
Yeah, I've noticed the same thing after my first gig with the amp. You really need to have the bright switch on for the clean channel but with it on, the OD is pretty harsh. I have the HRM treble trimmer set very low now and it has smoothed out the harshness while still retaining the chime in the clean channel. It's a big sounding amp live!


Quote from: Tone Control on September 05, 2010, 06:25:25 PM
Since then
My problem with the BM is that it's too dark with bright off and too bright with it on (with no OD).
I usually set presence to 2/10 on all my amps.
Solution for me is dial bass down a little, and set presence to 7/10, probably need to set the HRM treble trimmer lower still
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