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03-12-2019, 07:09 PM
Hi
Is the output stage hum-balanced? If the cabinet is not stiff enough it will transmit the vibration of the PT and OT to the reverb tank.
A simple yet awkward test to do is to get the tank to howl then lift the tank away from the speaker and hear if it quiets down (after the crashing). If it does, it suggests that there is a hum field within the cabinet - a sympathetic vibration due to shae or size. If the cabinet is square or close to it standing waves are easy to set up.
Is the output stage hum-balanced? If the cabinet is not stiff enough it will transmit the vibration of the PT and OT to the reverb tank.
A simple yet awkward test to do is to get the tank to howl then lift the tank away from the speaker and hear if it quiets down (after the crashing). If it does, it suggests that there is a hum field within the cabinet - a sympathetic vibration due to shae or size. If the cabinet is square or close to it standing waves are easy to set up.
