Tube Amp Archive

So any update to provide on your build? Having built an Ultraphonix with two different channels, the second being a variation of a JCM800, I am curious to hear yours with the cascading gain. There is already a lot of gain on my build's second channel, and probably way too much for the kind of music...

Have now aquired all of the iron. Will be a heavy beast!
All Heyboer with the exception of the PI tail choke.

Happy New Year all! Chassis from Ceriatone arrived. Excellent work as usual. Pics attached. I sized my PT cutout a few .001" too small and will have to work it with a file, but that's nobody's fault but my own. Next step is polishing the panels and lettering followed by clearcoat. I was going to pai...

hello moonlighter, thanks, I'll wait for a demo before I try to build one, I've learned over the years that each ear leads to different conclusions. With respect. Franco I'm flattered that you were willing to build along with me! This is a new design, and it's expiremental in nature, I don't expect...

Hi Moonlighter, I'm following your project and I'm starting to not understand what you want to do. In any case I'm waiting for you to have built the amplifier and posted a demo. Thanks Franco Hey Franco, What I'm going for here is a 3 channel Ripper type amp. Our main circuit is a Marshall 2203, bu...

Accumulated most of the components needed now, just some odds and ends left. Updated schematic labeled with what I actually purchased is attached. I've also changed the standby switch to a Merlin Blencowe approved variant. This is better for the life of the switch and offers a "soft start" for the r...

Chassis is drawn up, will verify and send the drawing to Nik tomorrow. I've decided to go for a lay-down Dumbleland look, with a 23.75" width chassis, similar to an ODR. I also think I'll paint the front and back panels (like I used to for pedals) and ink transfer the lettering. OD150WX for reference:

jazzbass wrote: ↑Thu Dec 12, 2024 11:43 am Hi moonlighter,

can you use this file? it was sent to me by a generous guy from TAG.
Franco

Thank you Franco! I'll be adding these to my library.

I'm going to have the second tonestack controls on the outside though, so I'll have to use an SSS sized chassis with 9 knobs on the front .

Majority of the parts are now ordered. Have to design the chassis, and then will probably contract Ceriatone for the fab like with the ODR.

I also have to design the power supply boards... probably the least fun part of any project.

new pic indicating dual input jacks https://www.facebook.com/photo/?fbid=10222483302946339&set=gm.10160457806657484&idorvanity=33039047483 https://scontent.fosl5-1.fna.fbcdn.net/v/t39.30808-6/469451760_10222483302986340_5435834989075583227_n.jpg?_nc_cat=106&ccb=1-7&_nc_sid=aa7b47&_nc_ohc=dOBP5eVaZQ...

Zoomed in and sharpened. Still hard to tell, but it seems more apparent it's a second cable with a metallic shell.

Roe wrote: ↑Mon Dec 09, 2024 2:11 pm looks like a stock 80s 1959 or - more likely - 1987

A Lead Series 1987 makes most sense, agreed.
But in the second photo we see it's not stock, there's a knob replacing one of the high inputs. This is common in Arredondo modded amps, but I'm curious if that is really the case here.

I stumbled across these photos again after seeing them for years, but something stuck out to me this time that I had never noticed before. There appears to be what I'm assuming is an Arredondo modified 2203, likely Beck's knowing he used them (JCM800 Series) frequently. Unless it has some other mods...

I have now successfully made it out of the pool and into the ocean. I'm not really sure this falls under the Dumble-style umbrella anymore, maybe "inspired by" is most fitting. Regardless, schematic attached. There is now a footswitchable Crunch mode added to the Clean channel. So now we have Clean ...

Why not try the cathode driver (as in some SSS circuits)? Or at least make a comparison of the two. I only have 1/2 of a 12AX7 available, otherwise I would. I also would like to keep this simpler than my ODR; a traditional Bassman only uses 4 preamp tubes and that's a fun design restriction to keep.