The 1967 Gretsch Pro Bass amplifier (Model 6170, often associated with factory/catalog numbers like D6262) is a 25-to-35-watt all-tube combo amp built by Valco in Chicago.
General Specifications
- Type: All-tube analog amplifier
- Configuration: Tall 1x15" combo cabinet
- Power Output: 25 watts (transitioning to 35 watts in later 60s production models)
- Manufacturer: Valco (USA-made, sister circuit to the Supro Thunderbolt)
Hardware & Electronics
- Speaker: Single 15-inch speaker (originally Jensen or CTS ceramic/Alnico depending on exact batch month)
- Inputs: 3 instrument inputs
- Channels: Single channel
- Controls: 3 knobs—Volume, Bass, and Treble—plus a line reverse switch
- Tubes: Typically features a 5-tube chassis running a dual 6L6 / 5881 power section
- Width: 19 inches
- Height: 27.5 inches
- Depth: 9.5 inches
- Weight: Approximately 39 lbs
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