I'll post a clip tonight or tomorrow with the latest tweaks. I'm now at the point where I can't go any further until UPS shows up with my order from mouser with parts. Unfortunately, I forgot a couple parts in my first order so I ordered about $5 in parts last night (along with $5 shipping) which will arrive a day or two later. The main tweaks now are the V2A and V2B cathode bias circuits and plate resistors and V1B cathode bias circuit. I'm going to try beefing up the power supply caps from 50UF (a tad light) to 75UF which should give me a little tighter bottom in the OD channel at the expense of possibly making the cleans a little more stiff. It's a balancing act.

The amp sounds so good now but I know it can be even better. I hope Nik makes this part of the standard circuit because it will remove complaints folks have about it being too aggressive and bright. Basically, when these changes are done, the amp should kill because the transformers appear to be incredible quality.

All parts rated for 500v unless otherwise specified.

Latest Tweaks:

    * Changed the treble cap from 330pf to 390pf (like dumble)
    * Tacked a 1uf cap across the 2 2.2uf cathode bypass caps. (Awaiting 4.7uf from mouser)
    * Changed the 150k resistor before the ratio control to a 180k
    * changed the 2.2k PS dropping resistor to 3.9k. (Awaiting a 3.3k from mouser)
    * Changed 1k power tube screen grid resistors to 470ohm

Another round of HUGE improvements. (Clips later). Additionally, it's no longer ice-picky for jazz stuff in the clean channel. Very sweet cleans out of the amp that rival the boutique cleans out of many other amps I've played.

When my mouser order arrives, I'm going to do the complete gamut of changes I've gotten from Gil and Scott and this thing's going to be a monsta!!!

I've been using emi wizards which are brighter and I really like them. The last 2 clips were done with the wizards. I also have a 2x12 cab coming with greenbacks.

I already lowered mine to about 35 but was thinking of going to 30ma. That's what I was setting my fender amps to. I might try EL34s in it too...

I have a 2x12 cab coming with greenbacks. It can be run either open or closed back. I'm hoping it'll get more of a hendrixy sound with my marshall clone but it'll be interesting to hear it with the overtone...

Mine doesn't require a screwdriver. It's just a shaft (no knob) sticking out of the bottom. Very convenient to adjust.

By the way, mine was biased at 42ma from the factory using tungsol str 6L6 reissue tubes. Anyone think that's a tad hot?

The changes I'm after are to get the OD to sound more like the robben OD and to open up the clean sounds so they are not so peaky. Also, I find that with the stock circuit I have to turn the tone control way down on the guitar and keep the treble and presence at 10 O'Clock so ideally I will have more useable tone control range.

Gathered from ampgarage and the brownnote forums, I am armed with the changes necessary to make this amp sound more like robben's dumble ala *ludotone or *uchs or *arole-ann.

When I'm done, I think you guys will find that the amp sounds much more delicious and it's only a few bucks in parts. Hopefully Nik will incorporate the changes back into the production model.

In addition to the values, I'm using carbon film resistors in certain audio-path areas and specic types of caps in other areas to make the tone more musical.

Stay tuned!

made 4 easy changes that made an incredible difference.

   1. Changed the resistor in front of the lead drive from 150k to 220k (In my amp this leads to a 100k pot. In older ceriatones the pot is probably 250k. It should be changed to 100k)
   2. Changed the suppressor caps on the v2 socket from 270pf to 390pf (I didn't have 330pf)
   3. Clipped the 15pf cap on the master
   4. Clipped the cap/resistor across the effect loop

http://www.sheetsofsound.net/demos/ceriatone-tweaked.mp3

There is something wrong with me because I think the 1265 is dark sounding and doesn't sound good with a strat? Whateva.

That'd be great! Let me know if you need a beta tester!

Just remember the fender tone stack is a lossy circuit. So that *IS* a disadvantage...

The Timefactor worked ok in the loop by seting the return to Line level.

It'd be better to have it built right in. 

why not get the kleinulator?

wait'll you hear the diff when you try a buffered loop...