Replacement output transistors for the power amplifier section of the Wurlitzer 200A. These devices form the final stage of the 200A’s solid-state amplifier and are responsible for driving the internal speakers with proper headroom and stability.

Failure of the output transistors is a common cause of:

• No sound from speakers

• Blown fuses

• Distorted or weak output

• Overheating amplifier section

• DC present on the speaker line

This set provides correctly specified, modern replacement transistors suitable for the 200A amplifier topology. Devices are selected to ensure appropriate voltage and current handling for the original circuit design.

Application

• Wurlitzer 200A amplifier output stage

• Suitable for servicing units with failed or shorted outputs

• Recommended when rebuilding or overhauling the amplifier board

When replacing output transistors, it is good practice to:

• Inspect and test driver transistors

• Check emitter resistors

• Verify bias network components

• Replace thermal compound and ensure proper heatsink mounting

Bias should be checked and adjusted (where applicable) after installation to prevent crossover distortion or overheating.

Important Notes

• Intended specifically for the Wurlitzer 200A amplifier circuit.

• Professional installation is recommended if you are not experienced with amplifier servicing.

• Always verify that the root cause of failure (e.g. shorted speakers, failed drivers, PSU faults) has been resolved before installing new output devices.

Servicing Available

If you would prefer the repair carried out professionally, we can replace the output transistors and fully service your instrument.

To book your Wurlitzer in, please contact info@possumpiano.com to arrange assessment and scheduling.