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Estimated price (community-sourced)
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About the MK III
The Dynaco/Dynakit Mark III (also written MK III) is a classic all-valve, single-channel (monoblock) power amplifier introduced in 1957. It was sold primarily as a Dynakit kit, with factory-wired versions also associated with Dynaco. Its output stage uses a pair of 6550 or KT88 beam-power tubes in push-pull configuration, driven by one 6AN8 tube and supplied by a GZ34/5AR4 rectifier. The amplifier is built around Dynaco’s A-431 output transformer and provides separate 4, 8, and 16 ohm loudspeaker taps. Two Mark IIIs are required for stereo operation. Specifications can vary modestly between production eras, published literature, and modified/restored examples; the data below reflects original manufacturer-published performance figures where available.
Specifications
Key Specifications
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