Amp discovery!

[Kinski]

Yeah, i agree, it does not seem VERY loud. Still plenty for me as an easy lazy practice amp. More voltage = more watts, so maybe try increasing your power supply to 24v. And/Or use a speaker with higher sensitivity. Also, maybe the SBEQ or some other preamp can boost your input signal more without clipping the 3118 board?

On Mon, Jul 18, 2016 at 11:14 PM, iggy [via Guitar FX Layouts] <[hidden email]> wrote:

Got two boards in today. and wired one up. Definitely works. Very flat EQ running direct. So some form of EQ is needed. I tested it with the Sea Blue EQ. Really sweetened up the sound. That thing does wonders for any set up I think. But I don't think I am getting any where near the volume level out of this thing as I should. Nothing like I'd expect for 30 watts. More like 5 watts. I don't see any adjustments on the board. And tried it with 9, 12 & 18 volts. From the little bit i was able to play with it. I did like the 18 volt best. More dynamic sound. But a very small playing sample. Until i knocked it off the bench and now it's just squealing at me.

Time of death. 17 minutes.

Next one gets a box.

How much volume are you guys getting? 30 watts that sucker should be loud.

Give that EQ circuit a try with this thing. Might be a winner.

One thing I did notice. Is that this digital circuit is very revealing. If you put something into that doesn't sound good, it'll sound like ass coming back out.

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NAML

Here's my new practice amp :


Joyo american sound --> tpa3118 powered at 18v --> superchamp cab with 10" and 8ohms speaker

Sound really better at 18v than 9v to my hears, and works perfect with a 250ma power supply. Surprised me how loud this thing could get. Maybe I'll implement a master volume to get a little less noise.

Happy to get that footswich box useful!

[Kinski]

Awesome! Glad it worked out for you!

On Jul 21, 2016, at 9:21 AM, régis@fofo [via Guitar FX Layouts] <[hidden email]> wrote:

Here's my new practice amp :


Joyo american sound --> tpa3118 powered at 18v --> superchamp cab with 10" and 8ohms speaker

Sound really better at 18v than 9v to my hears, and works perfect with a 250ma power supply. Surprised me how loud this thing could get. Maybe I'll implement a master volume to get a little less noise.

Happy to get that footswich box useful!

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NAML

I may add that for some reason 18V do not sound louder than 9v!

[Kinski]

Probably just a bit more clean headroom, yeah?

On Jul 21, 2016, at 3:20 PM, régis@fofo [via Guitar FX Layouts] <[hidden email]> wrote:

I may add that for some reason 18V do not sound louder than 9v!

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NAML

yeah, something like much more "space" in the sound. At 9v, Hard pick attack made my hears bleed.

the joyo match really well with it, and that's a preamp you can boost (for noise lovers anyway)! Loved it with a SHO!
When I'll have a chance I'll try it louder with my big cab...

Thank you very much for sharing your discovery kinski! made me happy!

[Kinski]

Finally got my build finished!

And it sounds damn good.

I paired the amp with a HAO Sole Pressure (reduced input cap, removed tone switch, and added a toggle to use Si, Mosfet, or No clipping diodes) and the Simple CabSim.

It all runs on an internal 12v 6800mAh Li-Ion battery. Or any external supply. And a 4" 50-watt speaker.
With the gain up, it can get crazy loud.

Nice build !

[Marbles]

Looks great! That would be awesome to have.

[Travis]

Dude that is badass! Cool knobs, they look like the ones on the Echoplex

Got a good source for small speakers?

[Kinski]

Hey thanks guys!
The knobs were salvaged from some busted electronics I found on the street.
For small higher watt speakers, I like these Boss Audio full range ones on Amazon. They come in a few different sizes.

https://www.amazon.com/BOSS-AUDIO-BRS40-50-watt-Speaker/dp/B001RNNX8K

This is my hotel amp when on tour or at home when feeling lazy.

[BetterOffShred]

I have everything to build Zach's Sunn Model T preamp, and was looking at small power amps to run it into, so I just ordered up one of these bad boys.   Looking forward to it.   I'll report back once I get it together.
-Brett

[rocket88]

If you're going to do that it might be a good addition to convert the phase inverter tube to FET. Might make it seem more like the real deal.

[BetterOffShred]

Yes that's an interesting Idea.   I will look into that

I have an old laptop power supply, and a couple 12V regulators coming from Tayda so I may run it all at 12V.  Kind of excited to mess around with this whole setup!
-Brett

[Kinski]

I just got a 19.5v supply I'm gonna try! Think it can go up to 24v. Look up the data sheet for the tpa3118 chip. They have a graph that shows voltage to watts output.  

On Sep 16, 2016, at 2:54 PM, BetterOffShred [via Guitar FX Layouts] <[hidden email]> wrote:

Yes that's an interesting Idea.   I will look into that

I have an old laptop power supply, and a couple 12V regulators coming from Tayda so I may run it all at 12V.  Kind of excited to mess around with this whole setup!
-Brett

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NAML

[Kinski]

Also, a lot of those laptop supplies have reversed + and - from our usual pedal supplies. I found out the hard ways while back and fried some stuff. Beware!

[Kinski]

19.5v supply works great! Its not any louder, but its certainly cleaner. Compared to 12v, I can crank the preamp a lot more before the power amp starts to clip.

Internal battery supplies 12v to entire amp.

When using an external supply, I have 12v regulators on preamp and cabsim. Power amp sees full voltage, which will be 19.5v from now on.

[Travis]

Bringing back an older post here..

Just ordered a couple of these boards, thanks for the link and info! Anyone done any more experimenting with these things?

[BetterOffShred]

Mines still sitting in the toolbox of pedals to come,   I just graduated from mechanical engineering school and started working so I got a back log of stuff to work on.  I've built and boxed 9 pedals in 2 weeks, so I'm happy about that, but I'd like to get this little amp going too.  I think I might try a cab Sim in addition to the model T pre, seems like it's worth a shot.  Plus I've never made a cab Sim. I'm kind of oldschool and just run everything through the 4x12 ..
-Brett

[Travis]

Congrats on your graduation and new job :)

Let me know what you end up doing man. I'm planning on putting this in a box with a few different JFET preamps that can be selected by a rotary switch.