frequencycentral "OBSESSION" Guitar Amplifier

frequencycentral · May 28, 2010, 03:27:45 PM

My new amp. Single ended, 12AX7 / 12AU7. Internal MAX1771 SMPS generating 240 volts from a 12 volt DC power pack. My best amp design so far I feel.........

Scruffie · May 28, 2010, 03:34:30 PM

That is definitiley your best work so far, that looks incredible! Even down to the layout and fitting two full sized tubes in a 1590B Amp.

I tip my hat to you good sir

azrael · May 28, 2010, 04:15:41 PM

Whoa! That looks freaking good! I love those tube guards, where did you get them?

Will you be selling this?

I wish there was something covering the tops of those tubes, though...
Does it just turn on when you plug in the power?

sundgist · May 28, 2010, 04:31:17 PM

Work of art!

8bitapocalypse · May 28, 2010, 04:54:50 PM

amazing work!

arma61 · May 28, 2010, 05:18:26 PM

your God has been good with you...

phector2004 · May 28, 2010, 05:26:28 PM

sound clips?

your minature amps are always fun to look at

JKowalski · May 28, 2010, 05:49:40 PM

Just out of curiosity, what kind of solder do you use? It comes out very clean and mirror-shiny... no flux residue... Or is that the result of after-solder cleaning?

Slade · May 28, 2010, 06:33:03 PM

Incredible piece of work!
Thanks for those beautiful/nasty/perfect pics.

richon · May 28, 2010, 07:21:05 PM

EXCELENTE !!!!!

wow... this is just a perfect match of size/clean build and amps desing

RICK, go on and do some DEMOS!!

rousejeremy · May 28, 2010, 07:31:54 PM

Rick, time yourself next time you begin soldering, I'd like to know how long it takes you to do THAT......

JFX09 · May 28, 2010, 07:54:36 PM

Cyborg Perf Boy from Outerspace strikres again !!

Luverly !

knealebrown · May 28, 2010, 08:00:48 PM

one day i tells theee!!!!

frequencycentral · May 28, 2010, 08:12:34 PM

Thank you for your kind comments guys!

Quote from: azrael on May 28, 2010, 04:15:41 PM
Whoa! That looks freaking good! I love those tube guards, where did you get them?

Will you be selling this?

I wish there was something covering the tops of those tubes, though...
Does it just turn on when you plug in the power?

The tube guards are from Banzai, they are modular, so it's possible to add an extra level to cover the top of the tube too. There just isn't any room for an on/off switch, but I figured it's no loss as the power pack can be turned off at the wall. I did consider using a stereo socket so you could just unplug the guitar to switch the amp off - do you guys think that's a plan?

Yes, I'm planning to offer these for sale soon.

Quote from: JKowalski on May 28, 2010, 05:49:40 PM
Just out of curiosity, what kind of solder do you use? It comes out very clean and mirror-shiny... no flux residue... Or is that the result of after-solder cleaning?

The solder I use is 99.3% tin and 0.7% copper. I don't do any after-solder cleaning, that how it comes.

Quote from: rousejeremy on May 28, 2010, 07:31:54 PM
Rick, time yourself next time you begin soldering, I'd like to know how long it takes you to do THAT......

Hahaha - I can probably perf a circuit in less time than it takes to etch, drill and populate a PCB.

Demos will have to wait until I get access to my mic.........

Scruffie · May 28, 2010, 08:20:42 PM

QuoteThere just isn't any room for an on/off switch, but I figured it's no loss as the power pack can be turned off at the wall. I did consider using a stereo socket so you could just unplug the guitar to switch the amp off - do you guys think that's a plan?

Just an idea here but you know those volume pots you can get on computer speakers where you turn it and it has a built in rotary switch that turns on the speaker before controlling the volume... I wonder if one of those could be found that would fit.

A bit like this I think, but smaller - http://www.maplin.co.uk/Module.aspx?ModuleNo=2208

knealebrown · May 28, 2010, 08:25:40 PM

how many Db can this thing kick out rick? is it giggable as back line in your average pub when mic'd up through a P.A?

Toney · May 28, 2010, 09:11:33 PM

Chapeau!

markeebee · May 29, 2010, 03:15:24 AM

CLICK! CLICK! CLICK!

That's the sound of Rick ratcheting the bar ever upwards. Phenomenal work.

240V? DC? On that tiny board?

SKWEEK!

markeebee · May 29, 2010, 03:33:32 AM

Rick, I was just thinking, how does it perform hum-wise? I'm guessing the heaters run direct from the dc input, is that noisy? Also I guess that the heater feeds are short enough to not be to susceptible to RF, and are probably fairly well shielded by the chassis, but can you pick up any chopping noise from the switcher?

Sorry, not wishing to be a pooper, i'm just in awe.

Also, where did you hide the spring reverb?

Hides-His-Eyes · May 29, 2010, 05:44:20 AM

You need to start marketing these better: they're absolutely beautiful and people pay absolutely silly money for things like a zvex nano.

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frequencycentral "OBSESSION" Guitar Amplifier