18W Guitar Tube Amplifier

Ok, well, another bonus page!

Recently completed a guitar tube amplifier and speaker cabinet build.  Schematic chosen is that of a TMB variation on an 18 Watt Marshall 1974 series tube amplifier design.  There are a dozen variants floating around on the web.  Check out first plug-in video on YouTube at the bottom (yeah, I got a little excited when the dial was turned only to about 4 or 5).


Back of Head and Cabinet

Completed Amp Head and Speaker Cabinet

Below are images of cabinet construction for the Head and Speaker:









Below are images of the electronics which operate through and drive the various tubes (transmit, modify and amplify the input sound from the electric guitar):

parts from various online sources

preliminary chassis layout

most of chassis layout before turret board

partially done turret board

near final chassis

near final chassis


final amplifier build


Images of the final build:


Modification to final build (speaker grille cloth changed to more 'period' look with black&tan cloth):

And 50W power attenuator added to the back of the cabinet (18 watts is a lot of power and this amp is too loud at anything above '4'):


 Video of first plug-in and 'test':



Video demo of amp sound:



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