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Runoffgroove - Ruby Amp

PostPosted: 30 Nov 2011, 00:27
by grrrunge
I whipped up a vero for the ROG Ruby amp tonight - thought i might give it a go, though it's maybe not as compact as i could be. It sounds pretty nice, and is supposed to go in a cardboard box along with a speaker i salvaged from an old tv :) I built mine with a 2N5457. J201's work fine as well.

Here's the vero - verified and all...
ruby.png

Re: Runoffgroove - Ruby Amp

PostPosted: 30 Nov 2011, 00:32
by sinner
Thanks :) I may give it a go. I have two tinny speakers saved from my old, crashed mac. It will sound geeky with those speakers, but hell... why not :)

Re: Runoffgroove - Ruby Amp

PostPosted: 30 Nov 2011, 15:08
by grrrunge
I decided that i liked this one enough to try and compact the layout a bit. It's not verified yet, but should be accurate ;) Here you go:

RUBY-VERO-V2.png

Re: Runoffgroove - Ruby Amp

PostPosted: 07 Feb 2012, 18:32
by geiristudio
Which ohm speakers can you connect to this ?

Re: Runoffgroove - Ruby Amp

PostPosted: 07 Feb 2012, 19:30
by rizibiz
Here is my (VERIFIED) version of the one knob Bassman modded Ruby Amp
Image

Sorry for the lots of jumpers and the jumper crossing. I really wanted to make it as small as possible.
Fits nicely in a 1590A
I built this last week and used a 8ohm 12" 70W speaker for it. It sounds okay to me.

First post BTW (thank you for all the knowledge here).

Re: Runoffgroove - Ruby Amp

PostPosted: 07 Feb 2012, 21:12
by kleuck
Just a suggestion : put a 1 watts resistor of 1/4 the impedance of your speaker, in series in the output.

Re: Runoffgroove - Ruby Amp

PostPosted: 07 Feb 2012, 21:30
by rizibiz
kleuck wrote:Just a suggestion : put a 1 watts resistor of 1/4 the impedance of your speaker, in series in the output.


kleuck, I'll try it on the weekend. What does this exactly do?

For those who are interested pics of my build:
Image
Image

Re: Runoffgroove - Ruby Amp

PostPosted: 07 Feb 2012, 21:34
by kleuck
I don't want to spoil, it's an experiment, i hear a big difference, want to know if someone else hears the same.
I tried with a true guitar cab (and that's the point...somewhat) so if anybody is willing to make the resistor switchable (just short it) and test with a good cab....
Actually i used a LM380, but doesn't matter.
Tiny built :wink:

I make a buffer in this enclosure : Image

Re: Runoffgroove - Ruby Amp

PostPosted: 07 Feb 2012, 21:51
by rizibiz
Allright then, I still have a free DPDT switch next to my pot. :D That was used to switch the 220pF cap on the volume lug but I didn't notice any difference so I finally left out entirely. :hmmm:
Anyways I breadboarded the original two knob Ruby and this 'Bassman' modded one and liked the later better with my Strat. Still somewhat sterile but I don't expect too much from such a low cost low part count build. Btw I drived a real 12" guitar cab with it. Plenty of volume for apartment practice.

Nice brushed enclosure kleuck. Love it. :applause:

Re: Runoffgroove - Ruby Amp

PostPosted: 07 Feb 2012, 22:08
by kleuck
Well, not really brushed...

Image

Re: Runoffgroove - Ruby Amp

PostPosted: 07 Feb 2012, 22:41
by grrrunge
kleuck wrote:I don't want to spoil, it's an experiment, i hear a big difference, want to know if someone else hears the same.
I tried with a true guitar cab (and that's the point...somewhat) so if anybody is willing to make the resistor switchable (just short it) and test with a good cab....
Actually i used a LM380, but doesn't matter.
Tiny built :wink:

I make a buffer in this enclosure : Image

That buffer looks good! :) I'm gonna try the resistor trick as well ;)

Re: Runoffgroove - Ruby Amp

PostPosted: 07 Feb 2012, 22:45
by kleuck
Thanks guys ! Hope you will hear something interesting (BTW, a 1/4 watts should be fine actually, i used a 1 watt one as the LM380 is a 2 watts IC, not useful with a 386)

Re: Runoffgroove - Ruby Amp

PostPosted: 18 Feb 2012, 12:12
by kleuck
So, did you hear something ?

Re: Runoffgroove - Ruby Amp

PostPosted: 18 Feb 2012, 22:44
by grrrunge
kleuck wrote:So, did you hear something ?


I haven't tried it yet, but i'm still excited to do so. Gotta get me som more free time :?

Re: Runoffgroove - Ruby Amp

PostPosted: 19 Feb 2012, 14:59
by rizibiz
kleuck wrote:So, did you hear something ?


I'm going to be honest. I didn't. :oops:
I ran it through my 12" 70W guitar speaker 1x12 cab but no noticeable difference for me with or without the resistor.

Re: Runoffgroove - Ruby Amp

PostPosted: 19 Feb 2012, 16:54
by kleuck
Shit, anyway i used a 1 ohms for a 3 ohms speaker, more obvious result i suppose, i'm gonna make a little TBA820M amp and give it a try with different resistors.