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 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
 
Specification:
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.

Magnum 50 Amp

This is one of a kind.

Made with permission from Sebago Amps, this is a unique variant of the rare SSS amps from the world's most elusive amp builder.

Modified blackface clean circuit with bass, middle, treble rotary controls, deep, bright and jazz switches, Hi and Lo Filter rotary switches, 9" short tank transformer driven reverb with Mix, FX loop and Master.

Because I had the space on the chassis, the reverb driver is a 6SN7, and the phase splitter is a 6SL7.  Octal warmth and goodness.  Remaining signal valves are 12AX7.

50 watt 6L6GT power amp.

Weber Chicago and Amsterdam speakers in a 212 cabinet.

This amp is unbelievable, sparkling clean, and so revealing.  Brilliant.


SSS 50 watt amp and 212 cabinet





































50 watt SSS guitar amp














50 watt SSS guitar amp














SSS amp interior

HarpToneAmps

80 watt harp amp
80 watt tube harp amp










Baxandall bass treble, boost/cut middle, presence
Hi gain, Lo gain, Master Volume

Optimised for crystal harp microphones


Quad 6L6GT harp amp









Quad 6L6GT power tubes, solid state rectifier


80 watt valve amp











Weber chassis and transformer set


"Amp looks magnificent front & rear, and internal workmanship superb!!!.....

... connected my mixer to the amp, with, guitar, mic, ipod, & turntable...set levels and enjoyed this for about 6 hrs, or more!!!!.... 

ALL SOUNDING & WORKING BRILLIANTLY!!!!

Very pleased I found your business, and placed the order.   I am sounding your praises near & far!!!....money very well spent, & enjoying every minute of my musical time!!!.....

 Very Best Wishes, & Thanks from me here....

 Denis"

VT40i Ampeg inspired amp

Have just delivered another VT40i amp, inspired by the uber clean Ampeg amps of the early 1970s.

This one is a de-rated 6L6GT variant, still good for 35 watts.  Cathode biased, solid state power supply.  I would have done it with a valve rectifier, but as you can see, the amp already has a lot of bottles.  Too many really, because it's quite a complex circuit (basically, an Ampeg VT4 pre-amp).  My next version of this amp will try to simplify things a bit.

Two inputs - normal and bright channel, each with bright and deep switch.
Shared tone stack, baxandall bass and treble, three way middle control with an inductor based cut/boost control.

Valve/transformer driven short tank reverb.

6L6 valve guitar power amp










  Ampeg inspired valve amp internal layout                                                                                                            












Speakers are Weber Alnico 1230-55 and a Ceramic 12V for a bit of classic brit rock tone


valve guitar amp head with 212 cabinet

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