Air Tight
ATM-1S
Introduced 2013$14,975 MSRP
Hand-wired EL34 push-pull stereo power amplifier from A&M Ltd with custom Hashimoto output transformers and point-to-point wiring; a refinement of the original 1986 ATM-1.
MSRP
$14,975
Used market · Excellent
$8,500est.
-43% vs MSRP
as of Aug 15, 2026MSRP to used market
From $14,975 at launch to $8,500 today (estimated).
Specifications
- Type
- power amplifier
- Inputs
- 1 RCA stereo pair
- Outputs
- speaker terminals (4/8/16 ohm taps)
- Topology
- tube push-pull, 4x 6CA7/EL34, 2x 12AU7, 1x 12AX7
- Weight
- 48.4 lbs
- Power output
- 36 Wpc into 8 ohms
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