Hallicrafters

Hallicrafters SR-2000 Crystal HC-6/U / CR-18A/U 10.0 MHz for 80 Meters 3.5 to 4.0 Used / Tested

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MPN:: HC-6/U
Condition:: Used
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Description

Hallicrafters SR-2000 Crystal HC-6/U / CR-18A/U 10.0 MHz for 80 Meters 3.5 to 4.0 Used / Tested

marked 10000.00 (10.000 MHz or 10,000.000 kHz) This is the correct heterodyne oscillator crystals (also called premix or injection crystals) for the Hallicrafters SR-2000 "Hurricane" transceiver.The SR-2000 is a vintage tube-type HF transceiver (circa 1965–1972) covering the 80m, 40m, 20m, 15m, and 10m amateur bands with high power (up to 2 kW PEP input on SSB). It uses a double-conversion superheterodyne receiver and a similar heterodyne scheme in the transmitter, where these crystals provide fixed, stable local oscillator injection for band selection and mixing to achieve the operating frequency.

From the official Hallicrafters SR-2000 service/operating manual (and consistent references in restorations and ham radio archives):

These are CR-18A/U type crystals in HC-6 holders.
This crystal is specifically listed for the heterodyne oscillator positions as follows:
- 10,000,000 kHz (10.000 MHz) → Covers the 3.5 MHz band (80 meters, typically 3.5–4.0 MHz).

The SR-2000's bandswitch selects the appropriate crystal (along with other switching for filters, preselector, etc.), and the VFO (permeability-tuned, covering ~500 kHz per band) tunes within each segment. The crystals ensure precise, drift-free injection for the first mixer stage.Other heterodyne crystals in the SR-2000 include:

13,500.000 kHz for 7.0 MHz (40m)
10,250.000 kHz for 14.0 MHz (20m)

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