Vintage RF Test Gear: Choose Between a Probe, Signal Generators, and an SWR Meter

Quick take

If you work on vintage radios or maintain an RF test bench, the first decision is what the bench is missing: a probe to demodulate a signal, a generator to create a signal, or a meter to measure standing-wave ratio. These four vintage RF test instruments cover those jobs across American and Soviet designs, and they differ in condition as much as in price. Your choice will come down to whether you want a tool that is ready to use, an accessory for gear you already have, or a project you are willing to repair.

Listed price comparison

Decision matrix

• Need a focused probe to add to an existing RF setup? The Dynascan PR-23 is the probe to choose.
• Need a signal generator for a working bench? The EICO Model 324 is the instrument to look at.
• Looking for a classic HP meter to restore? The HP 415E SWR meter is the model to target.
• Prefer a tube-based Soviet generator? The Soviet RF Signal Generator is the match.

Product notes

Dynascan PR-23 RF Demodulator Probe

At USD 29.99, the Dynascan PR-23 is the lowest-priced item in this group. It is a used RF demodulator probe made in the United States, and it comes with leads and clips already included, so you can connect it to a circuit without hunting for accessories. If your bench already has a signal source and you just need to demodulate RF for measurement, this probe is the focused choice. The limitation is its role: it is an accessory, not a generator, so it cannot produce an RF signal by itself. It is also a pre-owned unit, so the way it looks in the photos should guide your expectations.

EICO Model 324 Signal Generator

The EICO Model 324 is listed at USD 99.99, the highest price in the set, and it is the only unit whose title says fully working. It is a used signal generator made in the United States, finished in gray, and identified as model 324. If you want a vintage RF radio test generator that you can put on the bench without first repairing it, this EICO is the most direct match. The trade-off is the price: it asks for the largest cash outlay of the four. For a ready-to-run signal generator, the additional money buys you the stated working condition.

Vintage HP 415E SWR Meter

At USD 39.00, the Hewlett-Packard 415E SWR meter sits in the middle of the price range. Its title says untested and its condition is for parts or not working, so this is not a grab-and-go instrument. The appeal is as a restoration candidate or a source of classic HP test gear. The item is identified as a meter with MPN 415E. If you are comfortable with an instrument that may not function, the lower listed price makes it a reasonable project. The condition wording is the main limitation: there is no claim that the meter works.

Vintage Soviet RF Signal Generator

This Soviet-era tube generator is priced at USD 89.99 and covers 0.7-1.4 MHz, which makes it the second most expensive item here. It is described as used and sourced from Ukraine, and its construction includes a vacuum tube and a КПВ-2 variable capacitor. The design is very different from the American EICO, both in appearance and in the front-panel markings, so it will appeal to collectors of Soviet radio equipment. The limitation is the frequency range: 0.7-1.4 MHz is a narrow slice of the RF spectrum, so this generator is a specialty tool rather than a general-purpose replacement for a wider-band unit.

Final recommendation by use case

• If you need a signal generator for a working bench: choose the EICO Model 324.
• If you need a lower-priced accessory for gear you already own: choose the Dynascan PR-23 probe.
• If you want a restoration project: choose the HP 415E SWR meter.
• If you prefer vintage Soviet construction: choose the Soviet tube RF Signal Generator.