HRM layout question...

[tubedogsmith]

If doing a scratch build why put the HRM stack on the seperate little board and bolt it on top of the other? Why not just layout your big board right in the first place? Is it cosmetic correctness or is there another reason?

[heisthl]

Only reason not to is to make it easier to switch back to non-HRM

[odourboy]

Only reason not to is to make it easier to switch back to non-HRM

Reason enough for Gil!

[ayan]

Only reason not to is to make it easier to switch back to non-HRM

Reason enough for Gil!

Well, yes. However, I have to confess that I have HRM'd my latest build again. Why, might you ask? Because I ultimately don't like having separate masters in the non HRM amps and figured, before rewiring all of that, I will give the HRM another try.

Wouldn't you know it, I came up with a design that does all of it: LC at low gain levels, RF at medium gain levels and Yngwie or Gary Moore at high gain levels depending on the guitar I use! Sure. But, I actually have made some progress towards getting the amp to sound the way I like it, incorporating some changes I had in my previous HRM amps in 2000. Haven't gigged with the amp yet, so the jury is still out.

Cheers,

Gil

[Bob-I]

If doing a scratch build why put the HRM stack on the seperate little board and bolt it on top of the other? Why not just layout your big board right in the first place? Is it cosmetic correctness or is there another reason?

No reason other than space. I've done if both ways and where every amp has it's own voice, I don't thing it's the location of the HRM causing any difference.

[ElectronAvalanche]

Well, yes. However, I have to confess that I have HRM'd my latest build again. Why, might you ask? Because I ultimately don't like having separate masters in the non HRM amps and figured, before rewiring all of that, I will give the HRM another try.

Wouldn't you know it, I came up with a design that does all of it: LC at low gain levels, RF at medium gain levels and Yngwie or Gary Moore at high gain levels depending on the guitar I use! Sure. But, I actually have made some progress towards getting the amp to sound the way I like it, incorporating some changes I had in my previous HRM amps in 2000. Haven't gigged with the amp yet, so the jury is still out.

Cheers,

Gil

Hi Gil,

I must admit, that I too am currently favouring the HRM much more than the non-HRM, since I find that the OD is so much more refined in HRM. With the non-HRM you really have to have a post OD treble bleed pot/cap and yet you can get into buzzy terrain easily (think Sonny Landreth).

I use the 220k into 100k trimmer non-HRM OD input network in my HRM and think one can get really nice sounds with that.

Can you elaborate a bit more on your new circuit tweaks?

Dominik

[Mondoslug]

*Newbie alert -What happens if you stick a HRM circuit post Level & leaving the Ratio as is, not changing the Overdrive section to having a separate Master. If that made sense.

[heisthl]

you would lose too much gain, even if the tone didn't suffer there wouldn't be enough gain to compete with the clean sound. The non-HRM gets loaded to ground via the 100K level(ratio) pot and the 150k resistor feeding it. Even at level full on if you parallel the HRM tone stack to the level(ratio) contols output the signal is too close to ground for the needed gain. What might work was suggested by Funk in a post a few months ago and that would be to add a tone circuit (single tone knob, No slope resistor except for a 1 meg tone pot) similiar to what the Brownface Deluxe used. I have been itching to try this when I get the time.

[ayan]

Hi Gil,

I must admit, that I too am currently favouring the HRM much more than the non-HRM, since I find that the OD is so much more refined in HRM. With the non-HRM you really have to have a post OD treble bleed pot/cap and yet you can get into buzzy terrain easily (think Sonny Landreth).

I use the 220k into 100k trimmer non-HRM OD input network in my HRM and think one can get really nice sounds with that.

Can you elaborate a bit more on your new circuit tweaks?

Dominik

Hi Dominik,

I didn't mean to imply I favor the HRM. I still prefer the non HRM for what I do, but I am beginning to dig the HRM too -- I had already gone through this very same phase a long time ago, so this may be another short-lived honeymoon.

On the mods, as soon as I have played the amp to my satisfaction, I will write about them. I wouldn't want to post something that I may change my mind about next week. Nothing major, I assure you of that.

Cheers,

Gil

[Mondoslug]

you would lose too much gain, even if the tone didn't suffer there wouldn't be enough gain to compete with the clean sound. The non-HRM gets loaded to ground via the 100K level(ratio) pot and the 150k resistor feeding it. Even at level full on if you parallel the HRM tone stack to the level(ratio) contols output the signal is too close to ground for the needed gain. What might work was suggested by Funk in a post a few months ago and that would be to add a tone circuit (single tone knob, No slope resistor except for a 1 meg tone pot) similiar to what the Brownface Deluxe used. I have been itching to try this when I get the time.

Okay thanks for the usual detailed & concise reply.