Driftwood Purple Nighmare bias

[russell.hollmes5]

Whatsup guitar dudes and dudettes!

I recently got a purple nightmare, I really like it I know it got mixed reviews but I think it sounds pretty beefy.

Anyways I didn’t get a manual with it and after googling, searching their website top to bottom, searching YouTube, searching this forum…also I emailed Marek, no response yet.

I cannot find ANY info on what to bias the tubes to. There is a section on the back of the amp to plug in a multimeter and pots to adjust the bias and I am a technician by trade so I feel confident doing this, I just need to know what value to set these to. My amp came with 2 6L6 and 2 KT88 like many of them do. I checked the bias that the amp came with but I also want to verify that the tubes weren’t improperly bias’d by some other DIYer.

Thanks for any help!!

-Russell

 

[bugsy5150]

I bought a Darkest Nightmare new with the same tube set up as yours, here’s how the 6L6’s were biased from Driftwood.
Thirteen reading is watts!! Hope this helps!!

 

[strungout82]

Hi. It is worth a mention that if you use the bias test points of your Purple Nightmare then you are measuring only one tube of the pair (V6/9 or V7/8). I got this info from the Marek himself.