Choosing a vintage signal generator for rf network cable telecom test work means balancing the controls you want against condition, documentation, and listed price. These two used RF signal generators take different approaches: the Knight KG-650 emphasizes coarse and fine tuning plus modulation connections, while the Hewlett-Packard 606A brings an original operating and service manual, a stated 50 KC to 65 MC dial range, and two analog meters. Both are described as untested, making their stated configuration especially important to the decision.
Quick verdict
- Pick the Knight KG-650 when a listed price of USD 45.00, RF coarse and fine tuning, internal/external modulation, audio input, and RF output are the priority. It is the lower-priced choice in this comparison.
- Pick the Hewlett-Packard 606A when the original operating and service manual, large analog frequency dial, and percent-modulation plus DBM/volts meters are more important. Its listed price is USD 161.10.
- The listed-price spread is USD 116.10. Neither choice is described as tested, so this is chiefly a choice between the Knight's control set and the Hewlett-Packard's documented operating format.
Compact comparison
| Comparison point | Knight KG-650 | Hewlett-Packard 606A |
|---|---|---|
| Listed price | USD 45.00 | USD 161.10 |
| Condition | Used, untested | Used, untested |
| Tuning and range details | RF coarse and fine tuning | Analog dial stated from 50 KC to 65 MC |
| Modulation and readout details | Internal/external modulation and audio input | Percent-modulation and DBM/volts analog meters |
| Included documentation | Not stated | Original operating and service manual |
Where each product wins
Knight KG-650: control-focused vintage radio setup
The Knight has the clearer edge for shoppers seeking a compactly described RF-generator control set: coarse and fine tuning are both named, along with internal/external modulation, audio input, and RF output. Its lower listed price also keeps the initial outlay below the Hewlett-Packard option. The metal cabinet, original captive power cord, readable front-panel lettering, and apparently original knobs add useful vintage-equipment character without changing the central consideration that it is untested.
Hewlett-Packard 606A: manual and meter-oriented selection
The Hewlett-Packard 606A stands out for shoppers who specifically want accompanying operating and service documentation. Its frequency dial is described as covering 50 KC to 65 MC, while the pair of analog meters is designated for percent modulation and DBM/volts. Those stated controls offer a more explicitly instrument-oriented layout than the Knight description. Visible enclosure paint wear is noted, though the description also says there are no major dents.
Product notes
Knight KG-650 RF Signal Generator Vintage Tube Radio Test Equipment USA
The Knight Model KG-650 makes sense when you want a vintage RF signal generator with directly stated adjustment and connection features rather than a manual-centered package. Coarse and fine RF tuning give it a clearly described tuning arrangement, and the internal/external modulation options, audio input, and RF output give the unit several named signal-related controls. The original captive power cord and metal cabinet are also part of its described configuration. Its key limitation is condition: this used unit is offered untested. Cosmetic wear includes normal scratches, scuffs, dust, and signs of age, although the front-panel lettering is described as very readable. The included item is the Knight KG-650 RF generator only.
Hewlett-Packard 606A Signal Generator Vintage RF Test Equipment With Manual
Choose the Hewlett-Packard 606A if an original operating and service manual belongs at the center of your vintage test-equipment decision. The front-panel format is especially well defined: a large analog frequency dial covers 50 KC to 65 MC, and two analog meters are identified for percent modulation and DBM/volts. Multiple control knobs and a heavy metal enclosure with ventilation holes round out the stated physical design. The tradeoff is that it is also a used, untested unit, with visible wear to the enclosure paint and sides. It is described as having no major dents, but the listed condition still suits a shopper comfortable evaluating vintage equipment on its stated features and appearance.
Final choice by use case
Choose the Knight KG-650 for the lower listed price and its stated combination of coarse/fine tuning, modulation options, audio input, and RF output. Choose the Hewlett-Packard 606A when the original manual, 50 KC to 65 MC analog dial, and dedicated modulation and DBM/volts meters better fit the features you want on the front panel. For either vintage RF signal generator, the shared untested condition is a defining part of the choice.
