Kenwood KA-2200

Later, smaller, cheaper versions of Kenwood's big Sigma Drive "L" amplifiers, still unsure whether to label D.A.D. as CD or DAD or whether to stick it as an auxiliary input or not.

The 2200 is basically a KA-1000 deprived of its future-esque looks, of its separate power supply and of its Heat-Pipe cooling system. It also is, mainly, a slightly earlier but cheaper L-03A.
Construction is solid if "industrial" : no copper-all-over here.
Still :

> better wiring : short(er) signal wiring, ground connections with a multi-core wire 6x bigger than usual

> high-speed amplification : D.L.D. system ; fast rise time ; high slew rate

> low-noise phono section : relay-driven inputs which both accept MM or MC cartridges, single NFB loop, low-noise bipolar transistors for the MC section, low-noise FET transistors for the MM section

> Sigma-Drive hookup on loudspeaker "A" pair, all DC structure, two power transformers, four 22,000µF caps, 3-position loudness correction, MC cartridge impedance selector, multiple windings and local PS feeding.

> "slow-fade" muting : instant touch gradually mutes the signal by 20dB while re-touch lets the signal gradually come back to its previous level

The slightly smaller KA-1100 saw several (much) upgraded versions until the late 1980s (KA-1100SD, KA-1100D) while the smaller KA-990 saw even more versions, all very largely upgraded until 1987 : KA-990SD, KA-990V, KA-990D, KA-990EX !

The KA-2200 was somewhat upgraded once in 1986 (D-3300A) but it is such a better beast inside that it should be considered a different amplifier - it even has a digital section !