Discussion in 'Amp Building/Technical/Repair' started by GuitarsCanada, Jul 8, 2014.
Very nice Milkman. Good looking cab and i'm sure it sounds just as good as it looks.
This is my most recent project. Custom 5 Watts, single ended output stage, EL84 or 6V6 in the output, reverb and tremolo, foot switchable clean and drive channels.
Soundwise a cross between Marshall, Vox and Fender, beautiful sparkly clean of Vox with reverb and tremolo of Princeton goes up to crunch and drive of JCM800.
Cabinet was made out of pine, covered with real tweed, shellacked and clear coated with satin polyurethane.
Faceplate was done by nice guys from Mementos in Stitsville, anodized aluminum.
@epis I haven't used real tweed yet, how did you like working with it, how did it compare to working with tolex? Nice build BTW.
Thanks Scoltx, I love tweed. Comparing to tolex, work is more time consuming, but it's not more difficult.
I'm using carpenters glue, it gives you time to align the pieces. Working with corners is easy, use pinch technique and cut extra material with sharp scissors.
I use wood sealer before applying shellac. Zinser shellac is best, do not bother with flakes. I did try both.
I even wouldn't bother diluting it, two coats is equal to 6 coats diluted 50/50 with ethanol or methyl hydrate.
Rubbing it in with folded piece of cloth works better than using the brush.
If you wanted a smooth not shiny finish, even satin poly will show gloss of shellac.
What I do is scrubbing the poly within 15 to 20 minutes with scotch brite while it's not cured (hardened) completely.
At the end you'll have very nice, scratch resistant surface, very hard and not dampening wood resonance.
Well, I'm not nearly as adventuresome as most of you, but I did manage to put together a Trinity Tramp kit.
Fun build. Guts look like this.....
I've posted this picture before, but it's the only decent one I have showing the finished product in its cabinet (also supplied by Trinity Amps-minus the logo, of course).
The Mesa 1x12 is gone, replaced by a Vox 2x12 which suits the amp much better.
Replacing the JJ's supplied in the kit with a Winged 'C' 6L6 and a Tung-Sol 12AX7 made a HUGE improvement in tone. This little amp with a 6L6 puts out about 12 watts, and can get amazingly loud.
But 99.9% of its life is spent in my home office/studio, where I noodle around and do some recording.
This is complete remake of Cobra mk2 amp from 70s, I was asked to add master volume end effect loop at first, but it finished as full rebuild with added master, buffered effect loop and EF86 channel to existing diagram (copy of Fender Princeton reverb sans reverb )
These amps, cobra is same as riviera 725 from pepco, are cool amp, but very noisey (hum) , with poor tubes layout and heather wiring.
Amps is very quiet now (at idle LOL), very loud for two 6V6 in the output.
If I had to do same job again, I would make a new chassis, it was a hassle to reuse existing one.
I modded this old Bassmaster into a two ch Ampeg B15N using 5691,6550 tubes and a NOS B15S output transformer.
Just beautiful work guys.
I think we need a secondary thread for those of us "also ran" builders lol.
Here one of mine so far. A savage Croaker from Wattkins Amp Forum, sitting on a 1 x 12 with a Celestion Type A in it (Church Audio Supplied) and a Hammond M3 Grill cover
Digging this thread! Can't wait to contribute!
As usual, lovely work, Damir. I actually picked up a "Cobra" head from a Songbird garage sale (back when they were Songbird), and keep meaning to rebuild it into something else. Right now, the contenders are brownface Vibrolux, Tremolux, Deluxe, or Princeton. But I'm also wondering about other possibilities. In your experience, is the power transformer capable of powering another 12AX7 on top of the two already in there?
Thanks for kind words Mark . There is definitely enough spare power in that power transformer for your project. I would suggest another chassis, it's easier to build new one than reuse existing one.
This would be my first attempt at something like this. What, in particular, makes reuse of the existing one difficult?
Tubes layout, heater wiring...
I like to start with nice layout, so no unpleasant surprises at the end.
"D" Amp - my most recent project :
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