HRM trim setting

[sergio]

Hi , I'm starting to build my first HRM amp , but I don't know how set the trimmers 250k-1M-22k .
Anybody can help me?
Thanks

Sergio

[JD0x0]

Hi , I'm starting to build my first HRM amp , but I don't know how set the trimmers 250k-1M-22k .
Anybody can help me?
Thanks

Sergio

It doesnt matter how you set them it will just EQ the sound differently. youre supposed to play with them. 250K=treble 1M=Bass 22=Mids.

[stelligan]

Do yourself a favor and test the trimmers in and out of the circuit before you start tweaking. I wasted many hours trying to fine tune mine with a bad bass trimmer. Perhaps someone can suggest a better spec part for that location. The Piher trimmers that I used seem to be wimpy to have all the OD tone going through them...........

Some discussion here:
https://tubeamparchive.com/viewtopic.php?t=4515

[Bob-I]

I've found that the bass trimmer at 1M is too large for the Skyliner amp. Typically it acts more like a bass switch than a bass adjustment. I replaced mine with a 250K and it gets finer adjustment.

If you stay with the 1M, start with all 3 on 0, then turn the bass until it's comes on, like I said it's almost a switch. The mids about 50-70%, then treble to 30-40%, listening as you tweak. That'll be a good starting point.

Then switch from clean to OD and see how well matched they are. The goal IMHO is to have the OD have a similar BMT balance as the clean. If you ahve to adjust the front panel eq different for clean and OD, you're HRM is not correct.

JMO

[bluesfendermanblues]

I've found that the bass trimmer at 1M is too large for the Skyliner amp. Typically it acts more like a bass switch than a bass adjustment. I replaced mine with a 250K and it gets finer adjustment.
JMO

(Or parallel the 1M trimmer with a 330k resistor, to get 250K without the need for a new trimmer. )