The Man Who Taught a Community

Chuck Rippel, WA4HHG, is arguably the single most influential figure in R-390A restoration and education. Operating from his shop on Herring Ditch Road in Chesapeake, Virginia, Chuck built a body of work that spans virtually every aspect of the Collins-designed R-390A/URR military receiver — from safe power-up procedures for the first-time owner to the precise needle-splitting alignment techniques that separate a functioning radio from a truly restored one.

His contributions are not merely technical. Chuck Rippel created the infrastructure of knowledge that an entire community of boatanchor enthusiasts still depends upon today. Through his writing, his landmark video productions, his professional restoration work, and his generous participation on the R-390 mailing list, he established the standards by which R-390A restoration is judged — and gave thousands of owners the confidence and the knowledge to work on their own receivers.

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The R-390A Owner’s Manual

In January 1998, Chuck published what would become the foundational document for every new R-390A owner: The R-390A Owner’s Manual. Written in a direct, practical, ham-to-ham voice, the manual addressed every question a new owner would face when confronted with 85 pounds of Cold War-era electromechanical complexity.

The manual opened with what became one of the most recognizable passages in boatanchor literature, noting that the R-390A was designed in the early 1950s, released on 24 February 1954 — a date Chuck wryly noted “also happens to be my birthday” — and was capable of copying signals down to its −143 dBm noise floor, approaching the galactic noise limit.

The manual covered critical topics that no military technical manual addressed from a collector’s perspective: the 600-ohm audio output impedance and how to match it to modern speakers using a Radio Shack 70.7-volt line transformer; why you should never put the receiver in Standby mode (and what to do instead); the balanced antenna input and how to properly feed it; and a complete hamfest shopping list with vacuum tube types, quantities, and the firm injunction to purchase only JAN-specification tubes and to never install Chinese or Russian tubes in an R-390A.

The Owner’s Manual was distributed freely through the R-390 mailing list and later archived in the r-390a.net “Pearls” collection, where it remains the single most-referenced document in the R-390A community.

The Video Legacy

Chuck’s most ambitious educational project was his R-390A video tape set — a seven-hour, four-tape production filmed by Floyd Soo, W8RO, for HI-RES Communications, Inc. Released in the late 1990s, the set covered an extraordinary breadth of material: how to select an R-390A at a hamfest, detailed circuit descriptions of every module, front and rear panel operations, complete mechanical and electrical alignment procedures, PTO servicing, performance evaluation techniques, recommended modifications, troubleshooting methodology, and full restoration procedures.

The Hollow State Newsletter reviewed the video set in Issue #46 (Winter 1998–99), noting that while the content might be familiar to experienced R-390A hands, it provided invaluable guidance for newcomers. The reviewer observed that someone watching the complete set might well feel confident enough to take the plunge into R-390A ownership. The HSN also noted that HI-RES Communications had produced many videos for the Collins enthusiast community, positioning Chuck’s work within a broader educational tradition.

Chuck later produced an addendum DVD adding three hours and forty minutes of essential supplementary information. Together, the original set and addendum constitute over ten and a half hours of filmed instruction — a resource without parallel in the vintage military receiver community. Both titles were distributed through Electric Radio Magazine and Universal Radio, and remain listed (though now discontinued in physical format) in their catalogs.

The practical impact of these videos extended far beyond passive education. Community members repeatedly credited the videos with giving them the courage and technique to tackle procedures they would never have attempted from written instructions alone. One reflector contributor noted that he solved a problem by following Chuck’s video tips and would not have had the nerve to remove the RF deck without having watched the video first. Another reported that following Chuck’s PTO endpoint-checking instructions yielded a more than 20 dB increase in signal level.

Beyond the R-390A

While the R-390A was his primary focus, Chuck’s expertise extended across the broader Collins and boatanchor universe. The Collins Collectors Association lists him as an authorized repair resource for the 75A-3, 75A-4, KWS-1, and 32V series receivers and transmitters. His reputation in the Collins A-Line community was as solid as his R-390A work, with owners entrusting him with the restoration of some of the most valuable pieces in the Collins lineup.

Chuck also produced a four-hour video on the Hammarlund SP-600-JX receiver for HI-RES Communications. The SP-600 video was particularly noted for Chuck’s demonstration of how to replace every capacitor in the receiver — including the capacitors in the turret and RF strip, an area described by Universal Radio as one that “many mortals have feared to tread.” The video took the mystery out of this critical restoration step and gave SP-600 owners the confidence to maintain their own receivers for years to come.

The Professional Restorer

Chuck Rippel’s professional restoration service, operated from his Chesapeake shop, set the standard for what a properly restored R-390A should be. His waiting list frequently extended to a year or more — the Hollow State Newsletter noted in 1998 that his backlog was at least eight months, and community discussions suggest it often grew longer.

What distinguished Chuck’s restorations was both thoroughness and documentation. He went over every receiver with meticulous attention, not merely making it functional but restoring it to meet or exceed original factory specifications. Cosmetically, he repainted knobs, escutcheons, and meter bezels with black epoxy paint that he baked on. Electrically, every paper capacitor was replaced, every resistor checked, every tube tested, and a complete precision alignment performed. Each restoration included a full written summary of all work performed and final performance measurements — a level of documentation that was virtually unheard of in the boatanchor restoration trade.

The eHam.net review database describes him as a master craftsman, and one of very few restorers capable of bringing an R-390A to better-than-new performance. Community members who received their receivers back from Chuck described the experience with language normally reserved for fine craftsmanship — calling his work a labor of love. At one point, Chuck mentored a protégé to handle repetitive bench work under his direct supervision, maintaining quality control while managing the volume of work.

Technical Articles and Community Contributions

Chuck’s written contributions to the R-390A community are woven throughout the FAQ, the Pearls archive at r-390a.net, and the R-390 mailing list archives. His authored articles that became standard references include:

Article	Subject
IERC Tube Shields for R-390A	Identifying and sourcing the five sizes of heat-dissipating IERC shields; references Collins Service Bulletin #303 on shielded vs. unshielded tube performance
Variable IF Reference & Stage Gain	The tracking IF sections and their role in the R-390A’s selectivity and immunity to strong nearby signals
RF Deck Electrical Test	Procedures for testing and troubleshooting the RF deck, including the sub-band oscillator and antenna trimmer circuits
IF Deck Alignment	Proper alignment technique including the stagger-tuned IF strip philosophy and the importance of Q-spoiling resistors
R-390A Capsule History	Historical overview of the receiver’s development, manufacturers, and military service — cited in the Wikipedia R-390A article
Hamfest Shopping List	Complete tube inventory with quantities, JAN part numbers, and pricing guidance for building a spare tube stock
Vitamin Q Capacitor Replacement	Why and how to replace the original paper capacitors throughout the receiver, with guidance on voltage ratings and physical fit
PTO Servicing	Endpoint checking procedures and maintenance techniques for the permeability-tuned oscillator

His influence extended beyond his own articles. Chuck was a named contributor to the definitive R-390A production history compiled by Les Locklear for the Hollow State Newsletter and Electric Radio magazine, alongside Tom Marcotte N5OFF, Wally Chambers K5OP, and others. The Pearls index at r-390a.net lists dedicated topic entries for his alignment methods and his stagger-tuned IF strip philosophy. His reminder that the R-390A is fundamentally an AM receiver — and that faster AGC modifications for SSB compromise AM performance — became a touchstone of community wisdom, influencing even professional receiver designers. John Thorpe, designer of the Lowe HF-225 and AOR AR7030, reportedly restored an R-390A to use as his bench reference for the AR7030 design, vindicating the approach Chuck championed.

The Website

Chuck maintained a personal R-390A website, originally hosted at r390a.com and later at avslvb.com/R390A/. The Hollow State Newsletter described it as one of the best R-390A websites available, praising both its technical section — which featured articles on modifications, restoration procedures, RF deck testing, and antenna feeding — and its historical section, which provided an excellent capsule history of the receiver.

The site also served as the front door to his restoration business, listing parts availability and restoration services. Chuck’s website content is now cited as a primary reference source in the Wikipedia article on the R-390A — listed alongside official U.S. Army technical manuals, a remarkable distinction for a private restorer’s personal website. Though the original site is no longer online, the community preserved its essential content in the r-390a.net Pearls archive, ensuring that his knowledge remains accessible.

Legacy

Chuck Rippel’s legacy is measured not merely in the number of receivers he restored or the articles he wrote, but in the self-sufficiency he created within the R-390A community. Before Chuck, working on an R-390A required either military training or apprenticeship with someone who had it. After Chuck — after the Owner’s Manual, after the videos, after the website, after years of patient answers on the mailing list — an owner with reasonable technical aptitude had a complete path from unboxing a hamfest acquisition to operating a fully restored, factory-specification receiver.

His articles are quoted in the FAQ. His alignment methods are the standard procedures. His tube recommendations are the community consensus. His capacitor replacement philosophy is the accepted practice. His videos gave people the nerve to pull RF decks, service PTOs, and replace mechanical filters. His restorations set the benchmark against which all other work is measured.

In the world of boatanchor radio, where knowledge is currency and generosity with that knowledge defines character, Chuck Rippel stands as a giant. His work ensured that the R-390A — designed by Fred Johnson’s mechanical team and Ernie Pappenfus’s electronics team at Collins Radio in Cedar Rapids — will continue to be understood, maintained, and enjoyed for generations to come.

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References and Resources

Primary Sources

Community and Archival Sources