6L6 Push Pull Tube Guitar Amplifier, 25-50 Watt Head - diyAudio
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Old 9th July 2012, 07:24 PM   #1
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Join Date: Mar 2011
Default 6L6 Push Pull Tube Guitar Amplifier, 25-50 Watt Head

I have an amp I built myself. It features:

• Switchable Rectifer: Solid State or 5U4GB Tube
• Switchable Bias: Fixed or Cathode
• Three Power Modes:
50 watt- solid state rectifier and fixed bias
35 watt- solid state rectifier and cathode bias, OR tube and fixed bias
25 watt- tube rectifier and cathode bias
• Feedback Control: a unique feature that adjusts the amount of NFB for clean to mean!
• 4 or 8 ohm speaker switch
• Original Hammond Transformers, not painted
• New Roederstein Capacitors on main supply
• New JJ can capacitor for the rest of power supply
• New Mallory and Sprague coupling, tone and bypass capacitors
• NOS Allen Bradley 1 watt or more resistors or new wirewound resistors
• Adjustable bias control and voltage test port
• Dual Stage Footswitch with phat and screamy cascading boost
• Solid Hickory Cabinet with hemp rope handles
• NOS preamp tubes: 12AV7, 12AX7, 12AT7
• New Electro Harmonix 6L6GB power tubes
• Electric or Acoustic Guitar

Price: $550 (paypal accepted)

This was a Hammond AO68 organ amp I gutted and built with my own preamp design. It sound absolutely fantastic!! Great sounding distortion at low volume to awesome grind when cranked. It has clean to mean sound and compares to a Fender Twin to a Marshall Plexi. (IMHO) It works equally as wonderful as an acoustic guitar amp too.

From left to right-

The controls on front are:
On/Off Standby Gain Bass Treble Volume Feedback

The controls on back are:
Speaker Input Footswitch AC Plug

I am calling this and my other amps Mδnster Amplifiers and hope to build this into a business someday.
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Old 15th July 2012, 05:12 PM   #2
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Join Date: Jan 2012
Location: London
nice build! I like the rope handles 😊
the adjustable NFB idea is a neat trick. Do you have to balance it with the volume control to maintain the output level? And I assume the different power modes are separate taps off the PT? I don't suppose there's a chance to have a look at the schematic?
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