Pair of Vintage Hammond AO-39 Tube Power Amplifiers – A100 – EL84 – 220V

For sale is a pair of original vintage Hammond AO-39 tube power amplifier chassis, originally used in Hammond A-100 series tonewheel organs.

These classic American-made amplifiers feature point-to-point wiring, original Hammond output transformers and vintage components.

An excellent opportunity for Hammond organ restoration or custom tube amplifier projects.

Tube configuration (each amplifier):

- 2 × 6BQ5 / EL84 output tubes, push-pull configuration

- 1 × 12AX7 / ECC83

- 1 × 5U4 rectifier tube

Main features:

- Original vintage Hammond AO-39 design

- Original Hammond output transformers

- Power transformers suitable for 220V mains

- Traditional point-to-point construction

- Vintage components and wiring

Condition and testing

Both amplifiers have undergone preliminary power supply checks, with normal operating voltages measured.

Both chassis show normal cosmetic signs of age, including surface marks and oxidation. Please refer to the detailed photographs showing the external chassis and internal circuitry.

These amplifiers are suitable for restoring Hammond A-100 organs or for custom hi-fi and guitar amplifier conversion projects.

Please note that the original Hammond circuit requires the appropriate input interface, speaker load and electrical connections. These are not plug-and-play guitar amplifiers.

Sale includes both amplifier chassis.

A set of tubes, as shown in the photographs, is also available by separate agreement.

Careful packing and international shipping from Italy can be arranged.

Please feel free to contact me for additional technical information or photographs.