6SJ7 Pentode 18 watt Lite...Formerly the ABSOLUTE Minimum

TWANG · Post by **TWANG** » Sun 10/31/10 4:35 pm

goody goody goody
re: loud.

insanecopilot · Post by **insanecopilot** » Mon 11/01/10 6:44 pm

As far as i can tell it looks good Dustpuppy. Nice layout, what do you use to make it?

Dustpuppy · Post by **Dustpuppy** » Mon 11/01/10 8:31 pm

Thanks guys, I used OpenOfficeOrg draw to build this. I built a template a while ago with all of the shapes so it's quicker to lay out.

Dustpuppy · Post by **Dustpuppy** » Tue 11/02/10 10:55 pm

Ok, the board is done. Here are a couple of shots.

TWANG · Post by **TWANG** » Wed 11/03/10 10:21 am

nice!

StarGeezers · Post by **StarGeezers** » Wed 11/03/10 5:07 pm

Yes, that's very Nice !!!

Dustpuppy · Post by **Dustpuppy** » Fri 11/12/10 9:59 pm

ok I finished my Abmin 18. First power up. the bass was way too loose. I swapped a 1000uF for the 220uF cathode bypass cap. Now you were right. This amp sounds SWEEET! I did also add a tweed tone stack. Thanks for turning me onto this one.

Now I'd like to turn this schematic into a high gain amp. what do you think would work better? A 6C4 as the second triode or another 6SJ7? Or, should I just add a 12AX7 for 2 more gain stages? I'm in option overload!

Brett

Dustpuppy · Post by **Dustpuppy** » Sat 11/13/10 3:13 pm

I've had some time to put this amp through it's paces. I am impressed with it's tonality. The sustain is amazing and I have never heard distortion like this. The tweed tonestack does a adequate job. The Geez is right, bloody loud!

StarGeezers · Post by **StarGeezers** » Tue 11/16/10 11:57 am

DP, Glad you got it sorted !!!!

I really like mine too !!! for more gain we use an RF Drive , boards now available at tubeface.. That really does it for me ... plus the benefits of lots of toneshaping ... You must try one ... it's Easy with the PCboard... MY Fav od pedal ... and a Great match for the AbMin...

Take care , It could get LOUD er....

TWANG · Post by **TWANG** » Tue 11/16/10 12:25 pm

I just got my RF drive board!

StarGeezers · Post by **StarGeezers** » Tue 11/16/10 1:04 pm

TWANG, There ya' go eh!!!!

TWANG · Post by **TWANG** » Tue 11/16/10 5:46 pm

figuring out my parts order..
the 18 watt is the tortoise panel in the middle.

and I got my superlite chassis in today..
here's it and the raven combo cab I'll put it in..
still have to figure out how to lay it all in there..

StarGeezers · Post by **StarGeezers** » Wed 11/17/10 8:01 am

Nice collection there TWANG !!! You may have to cut that chassis down a bit ... looks Close !!!

TWANG · Post by **TWANG** » Wed 11/17/10 12:40 pm

She fits!
It's just sitting funny.

I got it 2 1/2" so it would clear the front top and bottom
and it's just right from side to side.

In the front the corner screws go right into the chassis lip, so I'll put bolt there.. and in the back, being 8" instead of 10".. I wanted the fuse holder to not stick out.. I'll add two bolts.

Still have to order some parts..got my bigger step bits coming..

StarGeezers · Post by **StarGeezers** » Thu 11/18/10 11:42 am

If it fits , that's GOOD !!!

TWANG · Post by **TWANG** » Sat 11/20/10 11:58 am

can't find the drill plan for II 2.7.
Spose I can make one.

I know I had an url. I think from sewatt... I'll look over there again.

Post by **zaphod_phil** » Sat 11/20/10 9:04 pm

More likely to have been from PPwatt.com

TWANG · Post by **TWANG** » Sat 11/20/10 11:17 pm

looks like there isn't one.

have to make one after all..
still looking for a way to hook it up.. is all that in the schematic?
PT etc?
I'll take a look of course.

Post by **zaphod_phil** » Sun 11/21/10 7:44 am

I'm sure at least a few people must have kept a copy of the layout and build instructions. I don't think there's much chance of building one of those PCB amps correctly without the drawings. The schematics on this site are very generic and don't have any of the build details.

I understand the plan is to make these PCBs available again, and therefore all the documentation will be as well.

xlch · Post by **xlch** » Sun 11/21/10 10:38 am

Twang
This should be the Drill plan you need
http://rh-tech.org/public/z_stingray_pc ... n%20v1.pdf
If this is not correct your going to have to use your PCB to mark the holes out and drill to the correct size. I do have a couple of the PCBs here that I have not started on. I dont own a scanner but I can have them scans of both sides made if it will help people out.
The schematic shows how to wire up the transformers.
Here
http://rh-tech.org/public/z_stingray_pc ... c%20v3.pdf

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6SJ7 Pentode 18 watt Lite...Formerly the ABSOLUTE Minimum