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Old 26th December 2013, 06:32 PM   #1
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Default Pure DIY Guitar Amp Project Ending... And Restarting !

Hello All,

I am finishing this Tube Guitar amplifier project, a one-of-a-kind fully designed and built by myself... A "Pure DIY" one, or nearly...

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Specs :

pure clean = 20W pentode / 5W triode.
overdriven = 25W pentode / 8W triode.
Volume/Treble/Middle/Bass/Reverb.
2x12AX7, 1x12AT7, 2x5881/6L6WGB.
Middle booster FSW.
10" speaker (Fender V1030 / 8ohms / 30W).
mass = 13.9kg.
size = 315x315x225mm (196mm top).

To complete the instrument, the faceplates (front and rear) are awaiting replacement soon for custom-engraved Black-Face style models...

A+!
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Last edited by tubelectron; 10th May 2014 at 09:01 PM.
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Old 26th December 2013, 11:10 PM   #2
DUG is offline DUG  Canada
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Very nice.
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Old 27th December 2013, 10:41 AM   #3
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very nice!
un petit bijou!
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Old 27th December 2013, 02:50 PM   #4
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Thank you, guys +++

A+!
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Old 27th December 2013, 03:40 PM   #5
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Wow, very nice. If I may ask, how did you go about designing it? Did you start with a basic schematic/build and then add to it (filtering, EQ, mid boost, etc) or did you design and build everything all at once? I ask because you've managed to fit an amazing amount of components, options and watts into a fairly small chassis!
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Old 27th December 2013, 03:51 PM   #6
esgigt is offline esgigt  Netherlands
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Nice work!!! The looks really Rock! I hope the sound does too ...
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Old 27th December 2013, 04:41 PM   #7
troystg is offline troystg  United States
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Awesome work! Doesn't even look DIY...
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Old 28th December 2013, 08:21 PM   #8
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Thank you, Guys !

Quote:
Nice work!!! The looks really Rock! I hope the sound does too ...
Here are two samples, showing various sounds and settings, recorded "direct-live" in a friend's music shop. The guitars were an 70's ES-345 and a Mini-Humbucker Les Paul :

R05 0002 PGJV2 Juju2.MP3 by tubelectron on SoundCloud - Hear the world?s sounds

R05 0001 PGJV2 Juju1.MP3 by tubelectron on SoundCloud - Hear the world?s sounds

Quote:
Wow, very nice. If I may ask, how did you go about designing it? Did you start with a basic schematic/build and then add to it (filtering, EQ, mid boost, etc) or did you design and build everything all at once? I ask because you've managed to fit an amazing amount of components, options and watts into a fairly small chassis!
It is a personal design and conception, but evidently I took some inspiration from many ideas coming from other circuits, and tested what was worth or useless to keep, add or modify...

For example, the power tubes sockets are mounted on a suspended plate, along with a damping screen, to avoid microphonics due to the compactness vs. power of the amp :

Click the image to open in full size.

The amp shows no adverse noise or microphonics and an excellent S/N ratio at any setting, even at full power : it is a great deal of design and labour to achieve that...

I am currently reworking the booster to give it a "more overtone, less midrangey" effect.

A+!
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if it works, don't fix it !
si cela fonctionne, ne touchez à rien !

Last edited by tubelectron; 28th December 2013 at 08:27 PM.
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Old 31st December 2013, 10:03 PM   #9
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End of the story :

- front and back faceplates changed to "BlackFace" custom engraved ones.
- revised footswitchable booster circuit, more brilliant, less midrangey-centered.

Click the image to open in full size.

Click the image to open in full size.

Happy New Year 2014 & Guitars & Amps & Audio & DIY &... Etc...

A+!
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Old 1st January 2014, 02:07 PM   #10
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Last pictures of the finished amp, taken outside this morning 1st day of the new year 2014 :

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A+!
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