RL Drake L-4B Grid / Volt Meter Used, in Excellent Working Condition

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MPN:: L4-B
Condition:: Used
Shipping:: $8.00 (Fixed Shipping Cost)

$99.99

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Description

Description

RL Drake L-4B Grid / Volt Meter Used, in Excellent Working Condition

This hard to find part was removed from a working Drake L4-B amplifier.

This is the multi-function analog meter from the front panel of the classic R.L. Drake L-4B HF linear amplifier (a popular 1960s/1970s 2 kW PEP amp using a pair of 3-500Z tubes). The L-4B has two taut-band suspension meters: one primarily for plate current, and the other (often called the Grid/Volt meter) that switches between grid current (typically 0–500 mA or similar range) and high voltage/plate voltage (typically 0–3000 V or scaled accordingly).

Key Specifications

Type: Taut-band suspension analog meter (sensitive, low-current movement for accuracy).
Functions (via meter switch): Grid current (mA) and Plate/High Voltage (kV or V scale).
Grid Current Scale: Commonly 0–200 mA or 0–500 mA DC (exact range depends on shunt; users confirm ~200 mA full scale typical).
Voltage Scale: High-voltage reading (e.g., 0–3000 V) for monitoring plate supply.
Mounting: Front-panel mount with specific bezel/housing; includes illumination lamps.
Purpose: Critical for safe tuning/operation — monitor grid current to avoid over-driving tubes and HV for power supply health.