The Bassman gets Tubes and Transformers, and then smokes one.

•28 June 2012 • Leave a Comment

I assumed that I had just shorted the artificial heater filament center taps to ground, but it turned out to be more likely that I’ve shorted the heater windings in the tranny to ground. Here’s a picture of it completely tubed up and ready to go. It’s a little fuzzy, but you get the idea.

I then removed the heater center tap assembly, which you can see here (although this picture is actually from before I installed the heater assembly.)

And here, just for fun, is a gratuitous iron shot.

That power tranny on the right will be replaced (hopefully soon) by an identical unit– unless I can find a way to put a larger PT on the chassis.

The Bassman Project Continues After a very long Hiatus.

•25 June 2012 • Leave a Comment

After the project sat for a very long time while I tried to finish my degree, I had a free summer where I got back into it. I decided to rework my schematic, plan a relatively careful layout, and make some more room in the chassis by going semi point-to-point, which allowed me to cut down the size of the board(s) I’m using. This  a picture early in the process, a few weeks ago. I actually had to replace that blue switch you see peeking out in the bottom right hand corner. There will only be a single input into this amp, which will go just to the right of the aforementioned switch.

I had been looking for a piece of brass to cover the gaping hole in the front of the chassis, so I could mount all the switches, jacks and knobs to something relatively pretty. A friend helped me acquire this piece, which I affixed to the chassis with JB Weld. Here, the chassis is sitting on the head that I constructed a couple of years ago.

Here we can see the wiring shaping up. A little cleaner that the rat’s nest that is my Champ, this time I planned my wiring a little better. White and the thick silver braided wire indicate signal. Red and white together is the Tonestack, and yellow wires indicate B+ power supply. Black is ground. As you can see, I cut out the center section of the turret board, and the preamp section has become more crowded than I’d intended.

And the project continues…

•9 December 2009 • Leave a Comment




Chassis inside head
Building the wooden box for the head was slow going without a jig. No drawn plans, either. I just knew how to keep the idea simple enough.

The long boards needed to be 2.5″ longer than the chassis, which is 17.4 inches or thereabouts– so I made it 20″x7.25″ and called it good. The sides are 7.5″ tall.

In the middle of building the box, I took a break to work on the turret-board. I needed a few connections in the center of the board in order to make my layout a little clearer, so I used my rivet gun– the rivets probably won’t hold solder very well– but as long as the electrical connections between components is real solid, there shouldn’t be any worries.

Here's the first cap! ORANGE!
Here’ the first cap that i mounted on the board– just to see how it looked.

Almost done arranging things
After looking at this– I decided that I wanted a bigger 4th filter capacitor– see the little blue one next to the big ones? I went and got another one.
As I began attaching leads it looked like this:
Coming right along

From here I need to do some work on the chassis front before I can mount my control pots.

On to new projects!

•6 December 2009 • Leave a Comment

I decided to build a Fender Bassman clone– and as I’ve liked my Peavey Valveking which has one, and Brian Patchett’s Eve amplifiers– I decided on an early Bassman circuit, the 5E6A (as opposed to the more popular ’59 Bassman circuit, the 5F6A).

This one will be just a head– I’ll have to build a cab later. So I began by noticing an ethernet switchbox at D.I. (The local goodwill store). I picked it up for a couple bucks. I have no idea whether it worked– but it doesn’t now! I gutted it.
Ethernet Box
Hmm-- ethernet guts, yumm.
In this second picture you can see the top that I’ve taken off is laying underneath the rest of the box. I later cut most of that top off, so that I’d be able to more easily work inside the chassis.
Empty!
At this point, I had no components– so I ordered some and in the meantime, I began working on a wooden box for the head.
Layered laminate board of some kind.
It took me a little while, measuring the width of the chassis, and the height of a typical 6L6 tube, finally I decide that I needed 7.25″ or more in height in order for everything to fit right. I borrowed a table saw from a friend of a friend–Thank you Greg and Greg’s friend!
After the cut:

For those of you that will never hear White Noise in real life.

•29 November 2009 • Leave a Comment

A clip of my Champ: Champ!

So I finished the front panel for White Noise

•21 November 2009 • Leave a Comment

I wish I had remembered to bring my camera to the woodshop. I had to use some less common tools for a part of this process. I enlisted the aid of a reputable luthier (violin builder) in west Provo, by the name of Hokansen.

I had 1/4 inch wood that I cut out 12 & 5/16″ by 13 & 3/8 to cover the entire front panel. This involved a saber saw and a drum sander. Measuring it was the hard part.

Then I came home and began the process of covering the wood in the last of my white vinyl.
First, here’s the wood on top of the vinyl.

I started by cutting the sides of the vinyl off until I had about 3/4 of an inch left, then I cut the corners off.

Then I cut a hole out in the center of the vinyl and began pulling portions of the vinyl back around the edge of the hole.

I continued til I had all of those little tabs pulled back.

I noticed then that the vinyl wasn’t stretching tight around the edge of the circle, so I went back and made each of those tabs half the width.

And this is what it looks like now:

Just another picture…

•18 November 2009 • 8 Comments

What should I name it?
I thought about 'Wheatey' originally, but that doesn't really fit now...