Discussion in 'Amp Building/Technical/Repair' started by GuitarsCanada, Jul 8, 2014.
Right speaker installed (thanks to forum member ) , huge sound difference.
Finished this JCM800 2204 build not too long ago, decided to go with purple tolex
This is a Trainwreck inspired build that I had some fun with
Had a customer bring in a tweed 4X10 blues de-ville that he ultimately wasn't happy with, so we decided to gut it and put in a (pretty close) 5F6A Bassman circuit.
De-ville circuit boards
Bassman - circuit board
End of day 1 progress
Here is my 1957 Rock-ola jukebox amp conversion.
Man - that Rock-Ola is the bomb! Both clean and dirty...
Here is a Trinity (kit) 5E3.
I always wanted one as a kid, but they are rare, at least in my town. Bought the kit last year from Trinity, and finally completed it this past winter. The instructions from Trinity are beautiful and clear, but I struggled to find the time.
I'm using an old 12" '64 Jensen from a Leslie 25 cabinet - the tweed cabinet was made for me, built just like the real ones, with a floating baffle.
Mods include a 1 Meg grid stopper on pin 7 of V2 to calm down the unwanted phase inverter harmonics when pushed hard into OD, and I have a Post PI master volume in mind (Trainwreck type a la Rob Robinette).
One other big thing is that I biased the power tubes waaay down from what the stock schematic called for, replacing the 5 watt 250 ohm resistor with a 10 watt 470 ohm resistor.
This puts older softer NOS power tubes in their happy place and puts the bias slightly cool for the new JJ's. The sound is really thick and lovely, tons of nice secondary harmonics, and the amp reminds me of my buddy's tweed that we all coveted in the 1970's.
I've got some old RCA 12AY7/12Ax7/5Y3 tubes in V1, V2 and V5 (rectifier) and a couple of new JJ's in for power tubes.
This little amp makes me smile every time I plug my old strat in.
This is a copy of an annotated stock 5E3 schematic in case anyone wants one:
Thanks again to Rob Robinette for this. (Non-animated version)
Moded JCM800 for high gain
And this is what was there before surgery :
Princeton reverb based 6L6 amp.
I built this amp a couple years ago. It is a Trinity Tramp kit and the cabinet was custom made by yours truly.
I wanted a low watt tube amp that I could play in the basement, something nice that people could use to test out my guitars. At first I was toying with the idea of buying something, Blues Jr or AC15 and making a custom cabinet for it. Then My wife convinced me that I wouldn't be satisfied unless I built the entire amp. So I started my quest for a kit and settled on the Tramp.
The cabinet is Maple and Walnut. The lumber was harvested from a farm only a couple concessions from where we live.
Hey fellas, I designed & built this 2x12 for a buddy of mine, and I know it’s not an amp, it’s just the cabinet, I’m currently refinishing his head to match - I’ll post photos when I’m finished with that.
I took apart his Kustom Defender, and reused the Eminence speaker that was in it, and paired it with a Weber Alnico Blue Dog for a super saucy blend.
This was definitely a small challenge given that this is literally the second time I've built an extension cabinet and it's my very first paying customer... any of you guys out there that do this full time, any business pro-tips would be much appreciated! I know I've got a LOT to learn, and the sooner I learn, the better!
The idea started off of a drawing of a cabinet that I (still) want to make out of solid wood, and kind of morphed into something a little different, but boy, am I pleased with how it turned out considering. The face of it is made up of 9 pieces (6 of which are 5/8" spacers for the grill cloth), but the maple accents on the face were planed down to 7/16" to accommodate sitting on top of the excess grill cloth that was wrapped underneath it. The angles were a tad tricky at first, but I think I managed to pin it all down pretty well! All in all it took me 12 hours to build (not including the glue and clamping of the joints for the shell and the 36 hour sit time for the glue to tack up properly), which I thought was pretty good!
I just started doing this on the side with the idea of seeing where it goes... what do you guys think?
Wow very clean build, congrats. And that cabinet is absolutely superb. May I ask what it is finished with?
Hey - that’s my amp build! Thanks for the feedback; I really enjoyed building it.
The finish is Target EM6000 production lacquer. It is a waterborne topcoat, has ful burn-in. Works much like nitro without the danger and smell. I use it on guitars too.
Thanks very much. That lacquer looks great. I can't stop looking at your cabinet. So nice!
Here is an amp that I just built for the salon rockstar (that's me!).
All tube, 1W, point-to-point, and seriously rockin'. A perfect match to my H&K 1x10 cab.
Here's a Tramp I built into a custom head cab I made. Pine and Walnut similar to Ayr's. Live edge through the middle so you can see the tubes glowing in a dimmly lit room. I'm trying to sell this one so I can fund another kit this winter (maybe an 18W?). Pictures aren't great.
Separate names with a comma.