1650G

Overview

The Hammond Manufacturing 1650G is a chassis-mount audio output transformer designed for push-pull tube amplifier applications. It features a primary impedance of 6,600 CT and supports secondary impedances of 3.5, 8, 16, 250, and 500 Ohms. The unit handles up to 35W of power with a frequency range of 30Hz to 30kHz. Primary DC resistance is specified at 200 mA current rating. It utilizes insulated flexible leads for connection and is enclosed in a shielded steel case.

Feature Summary

• Push-pull configuration for high-fidelity tube audio output stages
• Enclosed and shielded construction for electromagnetic interference reduction
• Multiple secondary tap options to accommodate various speaker impedances
• Chassis mounting design with bottom-mounted lead connections

Applications

• High-fidelity (Hi-Fi) tube amplifier output stages
• Guitar amplifier construction and modification
• Audio equipment requiring push-pull tube topology
• Custom audio engineering projects utilizing vacuum tubes

Procurement Notes

Verify the specific secondary impedance requirements against the available taps (3.5, 8, 16, 250, 500 Ohms) before ordering. Confirm that the chassis dimensions and lead lengths are compatible with the target enclosure design. Ensure the power handling capacity of 35W meets the amplifier's maximum output demands. Check for RoHS compliance status if environmental regulations apply to the manufacturing process.

Selection Notes

Select this model when a push-pull tube output stage requires a primary impedance of 6,600 CT. The wide range of secondary taps allows flexibility in matching different speaker loads without external transformers. Consider the physical size and weight constraints of the chassis, as these units are substantial. Verify compatibility with the specific tube types used in the circuit to ensure proper impedance matching and optimal performance.

Part Context

The 1650G belongs to the Hammond 1608A-1650A series of enclosed, shielded audio transformers. This series is characterized by plastic coil forms for insulation and support, along with minimum 8-inch insulated flexible leads. These transformers are engineered for above-chassis Type X mounting and are part of Hammond's classic audio transformer portfolio for tube applications.

Replacement Considerations

Direct substitutes within the same series include models like the 1650HA, though impedance values differ. Verify that any replacement maintains the required 6,600 CT primary impedance and push-pull configuration. Cross-reference secondary impedance availability and physical mounting dimensions to ensure mechanical fit.