Manufacture Date 1972, Week 48 — GEC Genalex factory. Tube Type Beam Power Tetrode. Model KT88. Results: 40 (MARGINAL / LOW). Common Use Power Amplifier. ALL TUBE AUDIO. Tube Specifications. This tube tests below minimum Good, it still may operate fine depending on its use.
Genalex KT88 Vacuum Tube Pair – Made in England – Tested – Vintage Audio
These are highly sought‑after classic audio tubes known for their reliability, strong output, and rich tonal character in high‑fidelity amplifiers.