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Nice, I ended up using a yugo ti 5751. The second go around couldn't find one, but a JAN 5751 was very comparable. I did the same for my meatsmoke's high gain side too. For my bass output, I had more range on the gain.
Interesting that you had to go to a slightly lower-gain tube. What is your bass that has such a hot output? And what kind of sound are you going for?

With my gain set to 3/4 (tick mark 6, counting from 0-8) and my bass up all the way, I could get a nice crunch on a hard attack, and a warm, resonant sustain - just what I'm usually looking for.
 
Interesting that you had to go to a slightly lower-gain tube. What is your bass that has such a hot output? And what kind of sound are you going for?

With my gain set to 3/4 (tick mark 6, counting from 0-8) and my bass up all the way, I could get a nice crunch on a hard attack, and a warm, resonant sustain - just what I'm usually looking for.
At the time, an 18 volt warwick EMG/OBP3. But I even liked it on my older 9volt Jazz setups. I always liked the edge the Zephyr gave me, with stock ax7s, but after the verellen responded so well I decided to try it. I could still get that grit, but I was more toward max gain. Below 2 or so was generally all clean. There was a few different interations of the zephyr, this particular one was an earlier one. I didn't open up my newer one
 
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I think the changes in the Zephyr had to do with replacing the second tube with a couple of MOSFETs to drive the outputs. The second tube was being used in a way that wouldn't affect the sound (very linear, no saturation). But it's possible there were some other tweaks. My Zephyr is the newer (single tube) version, built in 2017.
 
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I approached Micah about building a smaller, no tone all tube build, a 40 watt EL6 amp based on a home audio tube amp made by Cary, and instead took advantage of this bigger amp with the ability to bypass the tone section for only~15% more. A no brainer. KT88s, 70 watts, available for 10% off in celebration of Micah’s tenth year building these wonderful pieces of gear. Stellar customer care and involvement.
 
I trust the plexiglass Arkham logo is illuminated? :D

I have a Zephyr, which I love. Having that preamp paired with a good tube power amp (KT88s, yeah!) sounds like all-tube bliss. And 70W is IMHO in the Goldilocks zone: powerful enough to hang with a drummer, not so huge that it's too loud when pushed into a little sweet saturation.

Can you share any more details? Is the power amp similar to, say, a Fender? Or more like a classic Sunn (which was based on a Dynaco hifi amp)? Is there a post-power amp DI?

What kind of speaker do you have in mind to use with this?
 
I trust the plexiglass Arkham logo is illuminated? :D

I have a Zephyr, which I love. Having that preamp paired with a good tube power amp (KT88s, yeah!) sounds like all-tube bliss. And 70W is IMHO in the Goldilocks zone: powerful enough to hang with a drummer, not so huge that it's too loud when pushed into a little sweet saturation.

Can you share any more details? Is the power amp similar to, say, a Fender? Or more like a classic Sunn (which was based on a Dynaco hifi amp)? Is there a post-power amp DI?

What kind of speaker do you have in mind to use with this?
My guess would be this amp rests right in between. Im plugging into a Berg 4 ohm 212. My plan is to initially use it with an Oracle and a LowRider and a Meris Mercury X until i get a feel for what it can do. Initial tube burn in will play a factor, im tryna KISS right out of the box. I’ll be playing a Ken Smith fretless four.