If you want to join this blog, please send an email to andrew@amplifiers.com.au.
I will then send you an email request to sign up as a blog member.  

Unfortunately, this is not an automatic process due to the old-school clunky blog host I use, and it relies on a real human being (ie: me) to do site admin stuff.
So it might take a day or two.  But hey, I build valve amps, so surely you don't expect too much silicon in this blog zone.  And what's digital all about, anyway...

A Little Gibson rebuild

Vintage Gibson Amplifier

Gibson Amplifier - rebuild

Vintage Deluxe



A JCM800 Conversion

A reworked Marshall - straight JCM800 circuit

JCM800 - amp rebuild

JCM800 rebuild - guts

A Rebuilt Thang

This one is a rebuild from an old PA chassis.

Octal guitar amp

Rebuilt valve PA amp

Rebuilt valve amp - guts

Overdrive Deluxe

Twenty watt Overdrive Deluxe

Overdrive Deluxe 6V6 20 watt amp

6V6 Overdrive Deluxe tube amp

Overdrive Deluxe valve amp guts

Twenty watt harp amp

A twenty watt harp amp.

twenty watt harp amp chassis

valve harp amp

Valve harp amp
Close observers will see three signal tubes in this shot - I needed some more drive for the power amp, so added an extra gain stage.

Push Pull Direct Heated Triode

This is my latest amp for my hi-fi rig. A1939 design using direct heated triodes designed in the 1930s. How does it sound? The best amp I have ever heard, it's that simple.

6B4G direct heated triode

triode stereo amp

Layout is not the tidiest, but it doesnt affect the sound. Polypropylene coupling capacitors, nothing special. I wonder how vintage oil caps would sound.  Hmmm, must try that.

AWA A503 Schematic

push pull square wave
each channel 2 x 6B4G (6.3 volt version of 2A3), 6J7 volt amp, 6V6 concertina phase splitter,
shared power supply with 5T4 47uf+47uf choke pi filter followed by 80uf of oil caps

New Amps

I have been slow in updating this blog with new amps.  Here are some new ones.

small tube amp

6V6 18 watts, Ampeg style amp. Baxandall bass and treble, with a middle control of my own (both cut and boost).

Deluxe trainwreck combo

6V6 18 watt Deluxe (channel 1) Trainwreck (Channel 2)
reverb and tremolo, Weber 12F150 speaker.

Princeton octal pre-amp


Guitar amp with octal tubes

This one is the classic Princeton circuit, but done with 6SL7 octal pre-amp tubes, for warm warm vintage tone.
18 watt 6V6 power amp with GZ34 valve rectifier.

My customer said:

"I tested the amp at school with one of my students, it was the first time he had every played a valve amp ( although I did not tell him until later).

I let him turn it on and let the amp do the rest. He know nothing about the amp at all.

It was beautiful to watch and hear, his playing became instantly more refined, as he could finally hear all the detail in dynamics and tone colour.

The picture told the story immediately. He stopped talking , he listened, his eyes glistened, his playing became instantly expressive, a magic moment for me as a music teacher.

thanks mate..twas a good day."



small guitar amp







6V6 18 watt amp, valve rectifier, fixed tone stack.

Simplified Deluxe

Have just finished a simplified Deluxe amp.

My customer didn't want tone controls, but did want a proper BMT tone stack, so the amp has a scoop, so hardwired the classic blackface circuit as if every control was at 12 o'clock.  The only controls are Gain, Bright, Volume.

5AR4 valve rectifier (5Y3 also provided for a browner, more compressed response), ex-soviet military 6V6GT (cathode biased), cheap and cheerful Chinese AX7s.

A bit loud, apparently...  

Deluxe guitar amp Gain and Volume

6V6GT guitar amp hard wired

Big Red Rack Amp

 I have just finished a stereo rack amp, with a pair of KT66 on one side and a pair of EL34 on the other.  Just Volume and Presence controls for each channel, that's it.

Ben cut down and spray painted an old computer case, so it's Ben's Big Red Rack Amp.

stereo rack amp for guitar

stereo amp KT66 and EL34

19"rack valve amp amplifier

Here is another set of pics, posted by the owner of this amp, showing work in progress images.

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