The Harp Mic Shop

Item SCAU33
These Vintage Stromberg Carlson AU33 PA amplifiers make absolutely great Harp Amplifiers with Excellent Breakup and a strong output they produce.  This particular amplifier has been modified by installing 1/4" jacks for all 3 inputs and also for the Speaker Outputs.
 There are 3 Microphone input channels with separate volume controls for each channel and a 2 Terminal Phono Input with a lower gain than the microphone inputs. 
​ The Amplifier is in perfect working condition and has been thoroughly tested. All capacitors have been replaced with new capacitors and the inter-stage coupling capacitors have been upgraded to 0.1 uF to pass more low frequencies. Any defective components have also been replaced with new components.

The tubes are all in excellent condition (3-6SJ7 tubes, 1-6SF5 tube, 1-6N7 tube, 2-6L6 Power Tubes, 1-5U4G Rectifier tube.   All mic channels and all other controls are working perfectly.  You will also appreciate the presence of separate Bass & Treble Controls!  
  As you can see in the pictures there is a grounded 3 prong cord and a fuse to protect the amplifier in the event of a power problem.
  On the left side of the amp are 3 Speaker Jacks (1/4") for 4, 8 or 16 Ohm Speaker Loads.. Also on the left side are 3 microphone inputs (1/4") and the Phono Input. The 30 Watts of power is sufficient to power a variety of speaker loads.
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The amplifier measures approximately 14"x 9"x 9" and it weighs 25 pounds outside of the box.  Most of the weight is from the Huge Power Supply Transformer and Output Transformer which are necessary to provide a good constant output at the Bottom End and this amp definitely delivers there as well as throughout the Harmonica Range.

This is a great Harp Amp! Don't pass it up!