#1
Well, the basic idea is instead of having multiple gain stages, just crank the input volume with an SS preamp (with enough headroom not to distort of course). I realize it would get pretty muddy, so if I were to stick an EQ before and after it, I should be able to cut the muddiness out...

My whole idea is basically to build a 5 watt tube amp that can handle metal, and still be relatively simple to build

Thoughts?
Last edited by HibyPrime at Jan 3, 2009,
#2
do it! it would be awesome, and if you do it, take pics, i may have to copy you lol
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#4
vox advt series or roland cube
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#5
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vox advt series or roland cube


funny........


And I will be trying this :P
#7
Quote by HibyPrime
Thoughts from anyone else?

I'll test it for you
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#9
Basically...it'll be like an epiphone valve junior with a huge clean boost?
I'm not cool.
#10
yeah strangeangels got the idea.. imagine this

eq -> tube screamer -> tube screamer -> tube screamer -> eq -> valve junior

more than likely american voiced though, even though american voiced are harder to build, I just like the sound better
#11
you build it, make it work, and i'll buy one
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#12
Yeah, this is pretty much every "bedroom shredder's" dream come true. Also, any college student or apartment dweller.

I've ALWAYS wanted something like this, and if I get into med school, I'll want one for at least another 6 years. Build it so I can live vicariously through your 5 watt metal amp having-ness!
#14
Earthwormjim would you be willing to post a demo of that amp by any chance? Videos? Sound clips? Please?
#15
That amp uses 12au7s (au7 is capable of less gain than ax7) and was designed to be a vintage sounding amp, according to the link.. I looked it up on youtube, it sounds awesome, but it's definitely not a metal amp.

Well, I'll be honest with you guys, my plan was actually to build it and sell it if it works, this was a market test :P Give me a few months to gather the funds to build
Last edited by HibyPrime at Jan 4, 2009,
#16
Quote by HibyPrime
That amp uses 12au7s (au7 is capable of less gain than ax7) and was designed to be a vintage sounding amp, according to the link.. I looked it up on youtube, it sounds awesome, but it's definitely not a metal amp.

Well, I'll be honest with you guys, my plan was actually to build it and sell it if it works, this was a market test :P Give me a few months to gather the funds to build


Garrrn, we've been duped!

But.......um....if it rocks I'm buying it.
#17
Why not go for a hybrid preamp and solid state power amp? If you used a solid state output section you could do away with having to use an output transformer and you could get away with a smaller power transformer for the tube section. You aren't supposed to be bringing a power amp up to saturation anyways.

Also a proper equalizer circuit needs to be suited to the circuitry around it. A poorly designed EQ will make an amp sound worse and attenuate the signal more than it needs to be. You can't just copy a simple TMB style tone stack out of the middle of a famous tube preamp and throw it between a solid state preamp and tube power amp that uses different active parts.

And the 12AU7 in the firefly is used in the power amp, not the preamp. There are 2 12AX7s in the preamp.
#18
about the 12ax7's, I didn't see that on that page, where are you getting that from?

The idea was still to retain the tube preamp, but to have a pre-preamp type thing going on. I wont be copying any tone stack whatsoever actually, what I plan on doing is to figure out what frequencies get screwed up with the preamp being pushed so hard, and have that range of frequencies on a pot... if it turns out that it ****s everything up, I'll try grabbing a multi-band (at least 5) eq from somewhere and stick it between the SS preamp and the tube preamp. If it turns out that I end up leaving the pre-preamp EQ in the same place all the time, then I'll design my own tone stack, which is fairly simple to do.

Power amp saturation is one of the primary reasons for having a low power tube amp in the first place. I realize power amp OD is useless in the metal realm, the ability to push it to that point without pissing off the neighbors is an extra, very use-able feature.

and I'm not sure why you're suggesting a hybrid pre-amp? Isn't that going against the point of this build?
Last edited by HibyPrime at Jan 5, 2009,