khingpynn
Well-known member
Had my Brahma out at Swampdonkey Amps for the last little while going through various changes and such. The idea being to use the module as a platform to create a singnature mod with Chris of Swampdonkey. I did'nt want a huge change just build upon an allready good preamp.
Chris has quite a working knowladge of amp ccts hi fi, instrument and radio. I discussed with him the general direction I wanted to take the mod with terms like better clarity, beefier, less harsh top, a little more gain.
My knowladge of instrument amps is limited I do have some practicle experience and can perform several mods. However I'm not near Chris' level of competance.
The result is the named Brahma Shorthorn. Chris explained the cct topology and his changes. He explained 5-6 changes that occurred and why. The net result is the Shorthorn is far more complex sounding in the mids especially, a modest gain increase however a much more beefier tone and overal clearer tone. The highs are still there but there is a better balance.
We did a a final tweek which involved tweeking the bias resistance in the first preamp tube to give more gain. Though it sounded great I opted for the bias to be as it was before this tweek as I feel I can obtain similar results using the BBE Green Screamer... in other words the extra gain ( for Me anyways ) was not needed.
I'm going to work on getting out an A/B of my origional Brahma and the Shorthorn. We tested and matched up a quad set of JJ 12AX7 to reduce as much as possible any tube variance on tone.
Audio files to follow soon.
http://www.moose-meadow.com/swampdonkeyamps/index.html
Chris has quite a working knowladge of amp ccts hi fi, instrument and radio. I discussed with him the general direction I wanted to take the mod with terms like better clarity, beefier, less harsh top, a little more gain.
My knowladge of instrument amps is limited I do have some practicle experience and can perform several mods. However I'm not near Chris' level of competance.
The result is the named Brahma Shorthorn. Chris explained the cct topology and his changes. He explained 5-6 changes that occurred and why. The net result is the Shorthorn is far more complex sounding in the mids especially, a modest gain increase however a much more beefier tone and overal clearer tone. The highs are still there but there is a better balance.
We did a a final tweek which involved tweeking the bias resistance in the first preamp tube to give more gain. Though it sounded great I opted for the bias to be as it was before this tweek as I feel I can obtain similar results using the BBE Green Screamer... in other words the extra gain ( for Me anyways ) was not needed.
I'm going to work on getting out an A/B of my origional Brahma and the Shorthorn. We tested and matched up a quad set of JJ 12AX7 to reduce as much as possible any tube variance on tone.
Audio files to follow soon.
http://www.moose-meadow.com/swampdonkeyamps/index.html