I finally got around to building a HRM clone (http://ampgarage.com/forum/viewtopic.php?t=2976)
and would like to know from those of you that have built or played through both HRM and non-HRM how the relative ditortion points compare. On all non-hrms I have done with the 100K trim set above 35% to 45% and the drive at 9 O'clock or 10 O'clock there is some distortion present and it is a good overdriven sound for a blues solo. The HRM seems to need 60% to 70% on the 25K trim and the drive at 1 O'clock or 2 O'clock to approach the same level of distortion - does this seem like the HRM is acting correctly? In both cases preamp is set to V12 T1 M2 B2 with mid boost and in the HRM case also PAB.
HRM vs. non-HRM distortion levels
Moderators: pompeiisneaks, Colossal
HRM vs. non-HRM distortion levels
Former owner of Music Mechanix
www.RedPlateAmps.com
www.RedPlateAmps.com
Re: HRM vs. non-HRM distortion levels
I have my OD input trim maxxed out. Also, the OD gain pot should be 250K linear taper.
Re: HRM vs. non-HRM distortion levels
Good point - my Drive Pot is an Audio Taper. I have always used linear drive pots but someone told me an Audio Taper was better on the HRM.
Former owner of Music Mechanix
www.RedPlateAmps.com
www.RedPlateAmps.com
Re: HRM vs. non-HRM distortion levels
Norm,
The gain pot is most definately not linear. Alpha 15% taper is a little slow and 1 or 2 pm is need. But, I'd look for a 20% taper pot, like PEC. That would be better.
OD trimmer is set to 24k-26k to ground from wiper based on aqctual measurements.
The gain pot is most definately not linear. Alpha 15% taper is a little slow and 1 or 2 pm is need. But, I'd look for a 20% taper pot, like PEC. That would be better.
OD trimmer is set to 24k-26k to ground from wiper based on aqctual measurements.
Normster wrote:I have my OD input trim maxxed out. Also, the OD gain pot should be 250K linear taper.