The base schematic is the 'Super-Amp' model number 5F4.
There will also only be a single input channel instead of the 2 separate normal and bright input channels.
The first gain stage above uses a 12AY7 but this is to be substituted with an EF86 pentode. This will result in a modification to the circuit for the first gain stage. The circuit will also take advantage of the ability of a pentode to be run as a triode. This will be controlled by the use of a potentiometer, effectively allowing the player to control the tonal shift of the tube being morphed between either pentode or triode.
The tonestack to be employed will be a simple Fender Bandmaster tonestack. This will consist of a bass and treble potentiometer.
The presence feedback loop is to be omitted from the power amp.
Layout:
The following layout files have been produced as a guide,
The layout files above are rough drafts with the layout split with the first and second stage defined on the first image and the phase inverter and power amp visible on the second image.
The circuit will be implemented on a Tag board.
Changes:
Some early deviations from this schematic are that I will not be employing a rectifier tube or a choke in the power supply. Zener diodes will be used instead. I will also include a resistor placed after the first capacitor with a suitable value to induce sag.
The first gain stage above uses a 12AY7 but this is to be substituted with an EF86 pentode. This will result in a modification to the circuit for the first gain stage. The circuit will also take advantage of the ability of a pentode to be run as a triode. This will be controlled by the use of a potentiometer, effectively allowing the player to control the tonal shift of the tube being morphed between either pentode or triode.
The tonestack to be employed will be a simple Fender Bandmaster tonestack. This will consist of a bass and treble potentiometer.
The presence feedback loop is to be omitted from the power amp.
What stays the same:
The second stage is as is from the schematic. Also aside from the removal of the presence loop, the phase inverter and power amp stay as is.
Layout:
The following layout files have been produced as a guide,
The layout files above are rough drafts with the layout split with the first and second stage defined on the first image and the phase inverter and power amp visible on the second image.
The circuit will be implemented on a Tag board.
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