Hi,
finally finished my little amp. It all started with the savage croaker, but I ended up going on the direction of the trifty croaker.
Added a meter at the front to have some fun, it was quite difficult to make a proper driver circuit... but spice helped a lot there.
Made some experiments on solidworks to see how it would look like:
The circuit is very basic VJ like, but with the VVR for late night playing.
Gut shots looks like a mess...
I got a load of old meters that just needed a new paint job, the one I used on this amp is made of plastic, but the others have a metal front. Some of them are for really high voltages and currents, not sure if it would work with the same driver.
The faceplate was really easy, just printed it on a transparency and painted it with clear coat. I did it before with a gold background, and it works. Adding a pre layer of clear coat to the chassis and on the back of the transparency helps to make it glue together.
Thomas
finally finished my little amp. It all started with the savage croaker, but I ended up going on the direction of the trifty croaker.
Added a meter at the front to have some fun, it was quite difficult to make a proper driver circuit... but spice helped a lot there.
Made some experiments on solidworks to see how it would look like:
The circuit is very basic VJ like, but with the VVR for late night playing.
Gut shots looks like a mess...
I got a load of old meters that just needed a new paint job, the one I used on this amp is made of plastic, but the others have a metal front. Some of them are for really high voltages and currents, not sure if it would work with the same driver.
The faceplate was really easy, just printed it on a transparency and painted it with clear coat. I did it before with a gold background, and it works. Adding a pre layer of clear coat to the chassis and on the back of the transparency helps to make it glue together.
Thomas
Last edited:
Thomas:
Nice job!
Thanks for those tips on making the faceplate - It looks very 'vintage 40s factory' .
Nice one.
The croaker thread on wattkins.com was really interesting. I found it long after getting involved in the 100 buck amp challenge.
The croaker thread on wattkins.com was really interesting. I found it long after getting involved in the 100 buck amp challenge.
What size speaker is in there? I think I have seen some of your other small amp builds on youtube. How does this one compare in terms of tone?
It's a Jensen 6" alnico. I guess 6" is the smallest I could go using a guitar speaker, my other builds use TV speakers, you can see the comparison between the built in speaker and my 12" greenback on youtube.
This speaker already sounds better than the 3" speakers I was using, but with the max. voltage applied it's basically clean, and I can't push it harder because of my neighbors.
The VVR helps, but by setting the screen voltage it's still louder than I would play at home and gets fuzzy with the gain maxed. I had to limit the min. voltage applied, otherwise I was getting blocking distortion. To scale the whole amp I would need a more powerfull mosfet. Maybe I could try that to see how it sounds.
When I have some time I will make a proper video of it, for now I finished the schematic that I'm using:
This speaker already sounds better than the 3" speakers I was using, but with the max. voltage applied it's basically clean, and I can't push it harder because of my neighbors.
The VVR helps, but by setting the screen voltage it's still louder than I would play at home and gets fuzzy with the gain maxed. I had to limit the min. voltage applied, otherwise I was getting blocking distortion. To scale the whole amp I would need a more powerfull mosfet. Maybe I could try that to see how it sounds.
When I have some time I will make a proper video of it, for now I finished the schematic that I'm using:
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