SSS - Nukular Warhead - Chassis are Finished

[txbluesboy]

Hello tictac, I came up with some values for the filter circuit earlier in this thread. I asked for some feedback on these numbers, but got none. I'm not sure if that means it might work, or if its laughable? For now I'm proceeding without this part, it will all be mounted on the rotary switches and can be inserted in the circuit later. I hope there will be some more input on this topic soon. Terry

[tictac]

Funny how we make these different SSS versions, my build is a stereo SSS with two 6550's per side. I'm using the Prosonic OT as well!

For the HI & LOW Filter I'm using the circuit found in RDH4 which has been posted somewhere in this thread. I put the parts on an eyelet board and then wired the rotary switches to the board. This way it can be tweaked if the true SSS values are ever discovered.

[RJ Guitars]

Funny how we make these different SSS versions, my build is a stereo SSS with two 6550's per side. I'm using the Prosonic OT as well!

For the HI & LOW Filter I'm using the circuit found in RDH4 which has been posted somewhere in this thread. I put the parts on an eyelet board and then wired the rotary switches to the board. This way it can be tweaked if the true SSS values are ever discovered.

Tictac - that sounds like a good idea... would you be willing to share a look at that board?

thanks,

rj

[txbluesboy]

It seems that there were a lot of variations on the SSS from Dumble himself. A 100 or 150 watt amp wouldn't be to usable for me, I am a fan of singing cleans and reverb however, so I think this will be a cool amp.

[tictac]

My build is a little cramped but here's the filter board

[Structo]

Holy Crap!

That sure is intricate!

Is it running yet?

[txbluesboy]

Wow, Stereo makes it much more complicated looking, what are those coupling caps? Great work! Terry

[talbany]

Are Those Russian Commie Caps!!!


Tony VVT

[tictac]

They're Sprague Vitamin Q caps which I believe are paper-in-oil. I'm using Kiwame carbon film resistors for the preamp and metal films for the PI and cathode follower.

Yes the stereo layout has been challenging, it's like doing open heart surgery at times. I still need to install the power supply board, the cap board (all Solen's and they're really big) and a choke for the screen supply.

I don't have room for reverb but don't really need it since I'm going to be using an Eventide Timefactor stereo delay in front of the amp.

The Timefactor is actually why I'm building the amp in the first place; it's such a great pedal but I wanted a good clean amp to plug into...

[talbany]

Very COOL!!! Love to hear some clips when you get it going... Nice Work!!


Tony VVT

[txbluesboy]

This thing is complicated!

[tictac]

Got the Stereo SSS up and running finally. I originally went with the direct coupled cathode follower but had to give it up. The current draw was pulling the -Bias supply down. A note to future builders if you're going to direct couple, you need a bias supply that can supply some current. The SVT PT has a winding specifically for bias; my PT doesn't so I'm tapping off the primary with 100k resistors then diodes which is fine for most applications that require little current but not good for DC to the power tubes.

Also the filters don't work well, I'm going to need to replace them and I haven't got a clue what I'm going to use since the actual circuit is still an Undiscovered Mystery...

I haven't tried the amp with the 1x15 cabinets yet so I can't comment on tone yet but I think it there just needs tweaking...

TT

[txbluesboy]

deleted

[RJ Guitars]

Very Nice work Terry... I am getting ready to do a little work on mine... it will be mostly drawing and sorting out a build strategy in the next couple weeks because I plan to be away from the shop for a while.

I was thinking that I would do this in steps... beginning with building the preamp and gain structure like an ODS and actually getting that functional, then between now and then sorting out where to place those filters. Do you see any down side to that?

I'm also curious if anybody has thought in depth about the phase inverter and output sections. I have an inclination to borrow the PI structure from the SVT, then couple that into a Fender Twin output section? Any thoughts?

rj

[txbluesboy]

I am building in steps, I havent really decided where to put the filter either. I suppose I will start out with it last in the preamp section, before I choose between reverb or overdrive. If you notice, position 1 on both the high and low filter are straight bypass. If, as I suspect will be the case, that I prefer the clean/reverb setting at bypass on the filters, I am going to try the filter section in the overdrive circuit only to see if its more useful there. Terry