[Dredster]

Looking for some mods that can be done on a Grado headphone amp. I plan on bypassing the cheap volume control and coupling it to my Bent Audio Transformer volume control. Any other internal mods which would improve on the design.

[GrahamnDodder]

The Grado amp might not be worth doing a mod like that. If it were me, I would buy a used META 42 or buy or build a PPA from head-fi.org after selling the RA-1.

Tons of info here, and at head-fi.

GnD

[rickcr42]

being a very basic gain stage the RA-1 is actually easy to upgrade but you will be changing the character of the sound by doing so.

Possibilities would be adding a dedicated regulated power supply ,class A biasing of the output , changing the volume control to a higher qality unit and maybe replacing the input caps.

The strength of the grado , some say weakness,is the opamp used which specs out at 70 ma current drive to the headphones and since Grado cans like current it is a good match.Plus the slightly soft voicing of the passive parts/opamp is geared specifically towards taming the grado rising top end

hope this helps

[NotoriousBIG_PJ]

I found the meta to be a poor match with grados. Stick with the ra-1.

Biggie.