Eico HF-11 (1956)
The HF-11 is a mono integrated amplifier from Eico's "High Fidelity" series, introduced in 1956. It runs in triode mode and is rated at 12 watts. The output stage is a push-pull pair of EL84 tubes, with a 12AX7 input stage, a 12AU7 phase splitter, and a 5Y3GT rectifier. It was the mono companion to the Eico HF-10. Because it is monaural, two HF-11s were required for stereo, and the pair could be used that way.
The design is typical of the era, with point-to-point wiring on a chassis. Eico's own advertising in High Fidelity (November 1958, p.11) promoted the broader HF line. By the early 1960s the company was leaning heavily on its "uncompromising engineering + moderate price" formula for the newer stereo gear. The HF-11 predates that push, and the period record for this specific model is thin.
The HF-11 is a straightforward, well-regarded-in-its-day mono amp that is now scarce. Its siblings are scarce too, and the HF-11 is difficult to find in working condition today. No original price, dimensions, or detailed performance measurements are documented in the available record.
Known specs:
- Mono integrated amplifier, triode mode
- Output: 12 W
- Tubes: 12AX7, 12AU7, 2 × EL84, 5Y3GT
- Introduced 1956
- Mono companion to the HF-10; two units used for stereo
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