a gutar amp I built

[rman]

I all.

I just built a guitar amp of my own design. I have yet to put it in a cabinet but is working otherwise. It is a low power amp for use in my apartment. Even so I haven't really let it wail in here. Anyway I just thought I would toss the circuit out there in case anyone else wants to try it. It seems to work just fine.

Thank's Greg for the Speaker.

Rolf.

[rman]

Hi.

I see my little circuit generated zero interest. I thought I would add some pictures anyway. After using it for a while I quite like it, but I am no great judge since it is the only real guitar amp I have used. I used a page from Sy's book and made it a "Green light district" Overdrive sound can be achieved quite well with the tonestack bypassed.

Now I just need to learn to play.

Cheers.
Rolf.

[funkytek]

Interesting choices. Good to see you didn't try to regulate the output stage.

Have you tried switching between the LEDs and a resistor?

[rman]

Hi funky.

No, I have pretty much left it alone. Except for adding the tone bypass switch, it is my original design. The board is pretty crowded to mess around with too much. What difference in sound do you think using a cathode resistor might make? Thicker tone?

Rolf.

[MJL21193]

Originally Posted by rman

Hi.

I see my little circuit generated zero interest.

I'm not surprised, everyone is too busy replying to cable threads and the like to pay any attention to "DIY"

Good job man! Keep at it, post pics - some of us appreciate real DIY.

[godfrey]

Hi Rolf

Interesting circuit. What's with the pot, switch and two 390p caps at the grid of the phase splitter, though? Sorry if it's a dumb question - I'm not at all familiar with guitar amps.

Cheers - Godfrey

[Geek]

Looking gorgeous, Rolf

I totally missed this thread earlier.. my bad

Cheers!

[Colt45]

interesting choice of tubes

[jjman]

Originally Posted by godfrey

Hi Rolf

Interesting circuit. What's with the pot, switch and two 390p caps at the grid of the phase splitter, though? Sorry if it's a dumb question - I'm not at all familiar with guitar amps.

Cheers - Godfrey

Looks like a bright/off?/dark switch. I've never seen that with a dark setting. Very cool.

[rman]

MJL21193

Thank's for the encouragement!

godfrey and jjman

Right on jjman. It's a bright dark switch wrapped around the master volume control. Bright setting more effective at low volume, dark at higher volume. the effect is subtle but does add a measure of control over the sound that was very easy to implement.

Colt 45

The choice of tubes has two reasons. First, I already had these tubes except for the 6x4, but also I wanted to do something original. It seems that almost all guitar amps ever made use 12ax7 tubes so I had to use something else. The cascode second stage is to make up for the lower mu of the 6dj8. When I was playing with a 6dj8 cascode in a failed attempt to make a Broskie Janus regulator with it I noticed it distorts quite a bit when pushed hard. That is pretty much how I came up with this.

If I build another one I will try a James tone stack because I have read good reviews from people who have tried it. The two knob fender is just so simple with such a low parts count that it won. This project was getting Complex enough!

Greg.

I sent you an e mail with these pics too.

Cheers.

Rolf.