Make
RCA
Model
WV-98C
Year
~1964-
Overview
The RCA WV-98C Senior VoltOhmyst is a vacuum tube voltmeter (VTVM) introduced during the 1960s for servicing radio, television, communications, and electronic equipment. It was designed to provide high input impedance measurements while minimizing circuit loading, making it useful for testing sensitive vacuum tube circuits and early transistorized equipment.
The WV-98C became a common bench instrument in electronics repair shops, schools, amateur radio stations, and laboratories. It provided measurements for DC voltage, AC voltage, resistance, and peak-to-peak signal voltage.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | RCA |
| Model | WV-98C Senior VoltOhmyst |
| Type | Vacuum Tube Voltmeter (VTVM) |
| Introduced | Approximately 1964 |
| Measurement Functions | DC Voltage, AC Voltage, Resistance, Peak-to-Peak Voltage |
| DC Input Resistance | 11 Megohms |
| Maximum DC Voltage | 1500 V |
| Maximum AC Voltage | 1500 V RMS |
| Peak-to-Peak Voltage Range | Up to 4200 V |
| Resistance Range | Up to 1000 Megohms |
| Frequency Response | Approximately 30 Hz to 3 MHz |
| Tube Complement | 12AU7A, 6AL5 |
| Display | Analog meter |
| Power Requirement | 117 VAC |
| Country of Manufacture | USA |
Physical Description
The WV-98C features a compact metal cabinet finished in RCA gray-blue styling commonly used on RCA test equipment of the period. The front panel includes a large analog meter with multiple color-coded scales for AC, DC, resistance, and peak-to-peak measurements.
Controls include:
- Function selector
- Range selector
- Mechanical zero adjustment
- Ohms calibration control
- DC balance adjustment
Most units used an RCA WG-299 series probe assembly containing an internal resistor network for high impedance DC voltage measurements.
History
The RCA VoltOhmyst series was developed to provide more accurate voltage measurements than conventional passive volt-ohm meters commonly used during the vacuum tube era. Traditional analog meters could load sensitive circuits and alter measured voltages, especially in high impedance stages.
The WV-98C was commonly used for:
- Radio servicing
- Television servicing
- Audio equipment troubleshooting
- RF and IF alignment
- Amateur radio equipment testing
- General electronics bench service
The instrument remained popular well into the 1970s due to its large analog display, smooth meter response, and usefulness when servicing tube equipment. Many examples continue to be used by vintage electronics restorers and collectors.
The WV-98C was available in both factory-wired and kit versions. Optional accessories included RF probes and high-voltage probes for specialized measurements.
References
- https://www.radiomuseum.org/r/rca_senior_voltohmyst_wv_98c.html
Technical specifications, tube lineup, photographs, and historical information for the RCA WV-98C. - https://www.qsl.net/w0mpm/RCAwv98C.html
Restoration notes, operational discussion, servicing information, and vintage catalog references for the RCA WV-98C. - https://kb8ojh.net/projects/wv-98c/
Detailed restoration article covering repairs, circuitry, calibration, and internal construction of the RCA WV-98C. - https://archive.org/details/manualsplus_02891
Archived scanned documentation and manual files related to the RCA WV-98C. - https://www.youtube.com/watch?v=pJdVCwD2yE8
Video restoration and repair demonstration of the RCA WV-98C Senior VoltOhmyst.