Do the models handle the HRM part of an HRM model properly? But that, I mean that the HRM is essentially a second tone stack that's active when the OD "channel" is on. I don't see how the model addresses that.
HRM = HOT RUBBER MONKEY A clever way of saying hot rod marshall because thats what it is..
Keep in mind the ODS derived from a bassman and 50 watts at that..
Dumble changed some things up closer tolerance parts for one eventually changing transformers
and going to 100 watts..
Same thing Marshall did they took a tweed bassman then cloned that jtm 45
then the 50 came out about that time they said we can double that and make it 100
when 100s came out people flocked too those..
HRM is hot rod marshall he calls it hot rubber monkey mod to avoid using Marshall
also keep in mind Dumble was going to fender and buying parts transformers chassis boards
you name it then one day the GM or someone at fender looked at him coming in all the time and
noted how many times a week he was coming there so they essentially followed him to see what he was doing
and found out he was making Fender amps modifying them to sound better and using their parts to do so..
Dumble was given cease and desist orders and told your cut off stop what your doing now..
So then he found another company that had bought out alot of the overstock and started buying bulk
through them...
Pirates and bootleggers are a filthy lot and we should not do anything that would help them
so please do not share any of the information you might see inside a Dumble amp with anyone..
BWAHAHAHAHHAHA PLOOK ME RUNNING SIDEWAYS HE IS THE BIGGEST PIRATE OF THEM ALL.
Excuse me while I paraphrase :
In most amps the tone controls are before the overdrive stage. In HRM models the tone controls are after the overdrive stage.
The post OD tonestack on Dumble like amps also allows one to tweak the tone of the OD making the switch back and forth from clean to OD more usable for some folks tastes. Especially those wanting a more sparkly clean tone and a very smooth, non-buzzy OD tone.
It's what Howard Dumble named it.
Hot Rubber Monkey is the correct name.
As mentioned before, it is for fine tuning the overdrive tone.
The clean stage feeds into the overdrive stage.
The clean stage has front panel TMB controls and will also affect the OD stage.
The HRM trimmers are located on a small daughter board inside the amp.
You simple dial in your front panel TMB then adjust the trimmers inside for the OD tone.
In some newer models (1990s to present), the overdrive stages are followed by a passive tonestack (treble , middle and bass), which is adjustable using trimmer potentiometers inside the amplifier. This is known as the "Hot Rubber Monkey" (HRM) modification (these amplifiers are voiced for the overdrive channel to be used with the preamplifier boost engaged). Most players use three tones: clean, clean with boost on, and overdrive with boost on.
The "Skyliner" EQ refers to a newer (mid-1980s to present) way of voicing the tonestack. It is said to provide a better clean tone than the earlier voicing of the tonestack. Some lower serial number amps have been retrofitted with this EQ.
The so called "Robben Ford Mod" (terminology used by DIY-hobbyists) refers to using a power resistor instead of a choke in the power supply in order to induce more "sag" in the amplifier.