Product Overview
Victoreen RX-1 Hi-Meg Hermetic Glass Resistor - 10 MΩ, 2% Tolerance, 0.5W, 1000V
Condition
Unused NOS. Glass envelope is clear with no chips, cracks, or contamination observed. Red-printed markings - VICTOREEN, 10 MEGOHMS, 2%, and series code 492 - are crisp and fully legible. Wire leads intact and clean at both ends. Internal element visible through the glass. Sourced from legacy electronics supply chain recovery. Photos show the specific unit you will receive.
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Product Overview
Victoreen RX1-106G glass-encapsulated hermetic resistor. 10 Megohms, 2% tolerance. The RX-1 series was Victoreen's standard half-watt glass-sealed high-megohm line - purpose-built for circuits where surface leakage, atmospheric humidity, and dust would corrupt the measurement. The resistive element is suspended inside a sealed glass envelope, isolating it completely from external contamination. Victoreen supplied these to nuclear instrumentation, defense laboratories, and precision measurement programs through the mid-twentieth century. Series code 492 is printed vertically on the capsule. Approximately 45 mm body length as observed in photos.
Key Features
- Resistance: 10 Megohms (10 MΩ)
- Tolerance: 2%
- Power rating: 0.5W at 25°C
- Voltage rating: 1000V (1.0 kV)
- Construction: Glass-encapsulated hermetic - resistive element fully sealed, isolated from humidity and surface contamination
- Axial lead configuration, approximately 45 mm glass body
- Series code 492 printed vertically on capsule
- Red-printed VICTOREEN, 10 MEGOHMS, and 2% markings confirmed by photo
- No chips, cracks, or damage observed on glass envelope
Applications
- Restoring a Victoreen CD V-715 Civil Defense survey meter to original spec - desoldering the failed or drifted resistor and fitting this NOS unit to bring the meter back to calibration
- Replacing the feedback resistor in a vintage Keithley or similar electrometer where the original glass-hermetic unit has drifted outside tolerance
- Building or maintaining ionization chamber circuitry for a physics lab or home radiation detection project where surface leakage at the resistor body would corrupt the low-current measurement
- Integrating into a custom Geiger counter build where a high-megohm, contamination-resistant resistor is needed at the anode load position
- Experimental electrometer and vacuum tube circuit work where a sealed, stable 10 MΩ element is needed and a standard film resistor would introduce leakage error
- Makers and instrument collectors: a direct-fit replacement for any vintage instrument specifying an RX-1 series 10 MΩ value, or a distinctive build element for a scratch-built cloud chamber or particle detector
Frequently Asked Questions
Why does this resistor need a glass hermetic seal instead of a standard epoxy body?
At 10 Megohms, even a small surface contamination path - skin oils, humidity, or dust - creates a parallel resistance that measurably alters the effective value. The glass envelope seals the resistive element in an inert environment, eliminating surface leakage entirely. For ionization chambers, electrometers, and Geiger tube circuits operating at very low currents, that isolation is not optional.
What power and voltage ratings does this carry?
0.5W power rating at 25°C, 1000V (1.0 kV) voltage rating. Both are confirmed specifications for the Victoreen RX-1 series.
Is the 2% tolerance confirmed, or is that nominal for the series?
Confirmed. The 2% tolerance is explicitly stamped in red on the glass envelope and is visible in multiple product photos. The part number suffix G denotes the 2% tolerance grade within the RX-1 series.
Will this fit where an original Victoreen RX-1 10 Megohm resistor was installed?
Yes. This is an original Victoreen RX-1 series unit, not a substitute or modern equivalent. Axial lead configuration, approximately 45 mm glass body length. If the original circuit called for an RX-1 10 MΩ, this is the direct replacement.
Is a datasheet or documentation included?
Not included. This is a passive component - resistance value, tolerance, power rating, and voltage rating are marked directly on the glass body.
Mid-century nuclear instrumentation demanded resistors that simply would not budge - sealed against the lab air, stable across the measurement range, honest to within 2%. Sixty-plus years later, this one still reads VICTOREEN in crisp red letters. Put it where it belongs.
