The Leak Stereo 20 landed in 1963, right when Harold Leak was pushing his "Sandwich" speakers and point-to-point wiring into the living rooms of sensible English audiophiles. It's an integrated amplifier — 20 watts per channel from a pair of EL84s running in push-pull — but those numbers lie. The Stereo 20 isn't about volume; it's about presence.
What makes this box so special? The output transformers. Leak wound them with a ferocious attention to bandwidth and phase linearity that most companies couldn't afford to copy. The result is an amplifier that disappears. You stop listening to the gear and start listening to the music — the cliché, I know, but the Stereo 20 earns it. The midrange is liquid, the top end extends without etching, and the bass is taut and musical in a way that modern Class-D modules can only dream of.
It's also a sleeper. While Quad II and Marantz 8B command silly money ($3k+), the Stereo 20 still floats around $800–$1,500. Partly because it's less famous. Partly because it's not as powerful. But 20 watts from a Stereo 20 will drive a set of efficient speakers (say, 90dB or higher) into a room that makes your $500 solid-state embarrassment feel like a clock radio. I've heard it on Klipsch Heresys and vintage Tannoys — it's a match made in tube heaven.
The caveat? You need efficient speakers. And the original Mullard EL84s are getting expensive and failure-prone. Most units have been recapped and retubed by now; budget for a full service unless the seller shows receipts. Also, it runs hot enough to fry an egg — don't bury it in a cabinet.
But honestly? Buy one. Listen to it. Then sell every transistor amp you own.