Guitar Amp Project

amperex · 18th January 2006, 12:03 AM

My newest project. Tubes are one GZ34, three 12AX7s, one 12AT7 & four EL84. Controls are Volume, Bass, Mid, Treble, Master Volume, Feedback (Presence), Reverb, Dual Rectifier (Tube or Solid-State), Standby/Operate & Power switch.

Speakers are a pair of Jensen MOD 10". I should have it running tomorrow.

amperex · 24th January 2006, 04:00 PM

The amp meets sonic expectations. It sounds like an early '60s Fender. It makes sense as the amp has a Fender type tone stack with modded midrange pot of 20K. EL84s are hard bias for a cleaner sound, yet not having that part of the tetrode 6V6/6L6 glassy sound. In short, classic EL84 sonics on any hard bias EL84. The dual rectifier selects either a tube rectifier or a solid-state rectifier. The SS rectifier does have more of a harder sound. Using a small 10uF input cap to a LC makes the amp dead quiet & provides some voltage sag with the SS rectifier.

Anyways, on to the next project.

anatech · 24th January 2006, 04:17 PM

Hi amperex,
Looks good. Bottom shot? Schematic? I'm sure there are a few out there that may want to try it.

-Chris

xirxious · 10th February 2006, 08:07 AM

What does it cost to build?

amperex · 10th February 2006, 06:56 PM

It cost about $400- not cheap. I have not wrote up schematics, just 'floats in my head'.

Sorry about bottom pix, but I had the amp installed in the finished cab & do not want to disassemble. Looks like any other guitar amp underside.

24th January 2006, 04:00 PM	#2
amperex diyAudio Member Join Date: Feb 2005 Location: MI	Project complete The amp meets sonic expectations. It sounds like an early '60s Fender. It makes sense as the amp has a Fender type tone stack with modded midrange pot of 20K. EL84s are hard bias for a cleaner sound, yet not having that part of the tetrode 6V6/6L6 glassy sound. In short, classic EL84 sonics on any hard bias EL84. The dual rectifier selects either a tube rectifier or a solid-state rectifier. The SS rectifier does have more of a harder sound. Using a small 10uF input cap to a LC makes the amp dead quiet & provides some voltage sag with the SS rectifier. Anyways, on to the next project.

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24th January 2006, 04:17 PM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi amperex, Looks good. Bottom shot? Schematic? I'm sure there are a few out there that may want to try it. -Chris

10th February 2006, 08:07 AM	#4
xirxious diyAudio Member Join Date: Feb 2006 Location: Saginaw	What does it cost to build?

10th February 2006, 06:56 PM	#5
amperex diyAudio Member Join Date: Feb 2005 Location: MI	It cost about $400- not cheap. I have not wrote up schematics, just 'floats in my head'. Sorry about bottom pix, but I had the amp installed in the finished cab & do not want to disassemble. Looks like any other guitar amp underside.

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