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About Our Company
Max-Gain Systems, Inc. carries a complete line of fiberglass , including fiberglass round tube, square tube, and solid rod. Most of our product line is designed to "sleeve" inside adjacent sizes, allowing almost any custom length and wall thickness, while at the same time retaining the ability to be shipped via UPS or FedEx!
We are quite unique in that we sell our wide product line in small (even single piece!) retail quantities, which allows individuals and hobbyists, as well as industry prototyping research personnel to economically try multiple possibilities before buying larger quantities.
Max-Gain Systems, Inc. is a leading supplier of vacuum capacitors (both vacuum variable capacitors and fixed vacuum capacitors), in factory new condition (we are an authorized distributor of quality Comet vacuum capacitors), unused surplus, and used / checked / guaranteed condition, all at GREAT savings!
We stock a wide line of vacuum relays by Jennings, Kilovac, and other top manufacturers, in new or used / checked condition, all at lowest prices.
We are a full line factory distributor of top quality products by the Bristol Wrench Company, including the entire line of Bristol spline wrenches. We sell in single piece quantity or in any volume!
We are full line suppliers of high quality RF connectors and RF adapters, both retail and wholesale. (Dealers... ask about wholesale pricing!) We stock many types that are almost impossible to find elsewhere.
We sell an ever-widening line of hard to find RF related parts .... and, WE SHIP ALL OF OUR PRODUCT LINES WORLD WIDE! Let our shipping specialists suggest shipping options for your purchases.
Max-Gain Systems, Inc. is a wholesale supplier of fiberglass tube and rod to many of the best-known names in antenna manufacturing, both in the ham radio and military markets. We supply more fiberglass to more antenna manufacturers than any company in the world. We also supply fiberglass to many other industries and uses, such as ultralight aircraft, tool handles, tents, driveway markers, towed aircraft banners, electrical utilities, universities, national laboratories, concrete reinforcement, hinge pins, recreational vehicles, and the inventor with an idea for a new product. We are a unique source for sleeving adjacent sizes, in stock, and in even single piece quantity for prototyping! No need to pay for mill-runs just to see if a prototype will work. Our contacts and relationships allow us to provide superior product at lower cost than a single commercial user dealing direct with a single factory. Let us quote on your needs!
We can research and locate fiberglass products needed for your manufacturing, and in many cases suggest alternate or lower-cost solutions. Quantities for wholesale price breaks can be surprisingly small, and custom colors and lengths are possible as well. Inquire by email or telephone.
Hours are 7am to 4pm Eastern time, Monday - Saturday.
Fiberglass Products for Amateur Radio
Max-Gain Systems, Inc. stocks a wide variety of fiberglass, ideal for: VHF and UHF antenna construction, satellite antenna cross booms, masts, quad spreaders (UHF to 40 Meters!), shaft material, open wire feedline spacers, and many other hobby uses. . Our line is designed with the needs of the amateur (ham) radio operator in mind. We carry a wide line of spreaders for quads and quagis... (UHF through 40 meters!), custom crossbooms for the satellite enthusiast, and non-inductive fiberglass masts. The ability to ship crossbooms and spreaders via UPS or FedEx can result in big savings compared to motor freight charges. We offer free tech help to our customers. We have the following, in stock, ready for shipment. Click on FIBERGLASS PRICE LIST to see our retail price list.
Fiberglass Push-Up Masts! Our new line of heavy duty fiberglass masts is now available in heights of up to 43 feet. Our line is also EASILY CUSTOMIZED to your particular need, as we sell our mast system BY THE PIECE! Our fiberglass masts all use full 1/8 inch wall fiberglass, not the flimsy thin-wall masts you have seen before. CLICK HERE to go to our push-up mast page!
Bristol spline wrenches, (sometimes erroneously called "Bristo" wrenches) are used in a wide variety of fields, including radio/communications, avionics, astronomy, refrigeration, engraving/printing, and construction/farm equipment. We sell a variety of spline "L" key kits, including the #SS-508, designed for radio/communications hobby use. Custom kits are also available in quantity for your particular industrial need. Visit our spline "L" key page.
We sell the entire line of Bristol spline screwdriver handles and straight bits (both in standard and optional longer lengths) favored by avionics shops, military, and other professional service technicians in many industries. For volume users, we sell many items in boxes of 100. Discounts and/or free shipping are available with increasing volume. For a complete product listing and numerous descriptions, visit our Bristol Wrench Company spline products page.
RF Connectors and Adapters
Max-Gain Systems, Inc. (MGS) is proud to offer a new line of the most popular types of RF adapters to our customers at very reasonable prices! After a long search, we have located a producer whose quality we were satisfied with (no small task at a reasonable cost) and we have become direct importers of these lines. We carry all of the "usual" types like UHF, N, BNC, RCA, TNC, SMA, mini-UHF, double banana, and 3.5 mm, AND the "hard-to Find" ones, too ... including types C, MC, MCX, MMCX, reverse polarity N (RP-N), reverse polarity SMA (RP-SMA), reverse polarity TNC (RP-TNC), SMB, and SMC! Whether you are looking for adapters for Wi-fi, GPS, or Wi-Max, we are likely to have exactly what you need, all in top quality at VERY reasonable pricing!
Unlike most sellers of adapters, it is actually EASY to locate the adapter you need. Our adapter catalog page is cross-referenced, and contains PHOTOS of all adapters if you "aren't quite sure what it is called". Our catalog lists each adapter both ways....for example: the very popular part number i330 (N male / UHF female adapter), is listed both under the "N" male adapters and under the UHF female (SO-239) sections. Simply pick either end of the adapter you want, look under that section, and quickly find your adapter. Still in doubt about what you need? Just view the product photos below or click on the part number listed below to quick jump to the photo area! It's very hard to mistake what you want that way!
Your satisfaction is always 100% guaranteed. If not satisfied for any reason whatsoever, just email for a return authorization, return connectors to us prepaid, and your purchase price will be immediately and cheerfully refunded. All you ever risk is shipping. Ask about price breaks for quantities, as well as wholesale pricing for resellers!
Don't see what you want? We WILL be increasing our lines, but wish to see what our customers need first, so if you need one that we currently don't carry, email us ( firstname.lastname@example.org ) with a description of what you want, and we will consider it for our next shipments.
Click here to go to our Connectors and Adapters pages:
RF and Microwave Components
MGS is pleased to announce that we will be offering a LARGE selection of hard to find RF and microwave related items! After many customer requests to expand the very popular "President's page" section, we have decided to expand the MGS product line to include military and commercial surplus RF and microwave items at VERY affordable prices, and with our famous MGS customer service and satisfaction guarantee. We will also be able to take many payment forms such as Visa and Mastercard, which are not available on the President's page. Adding these lines to our website will take some time, but watch this section for an ever expanding list of vacuum variable capacitors, vacuum relays, tube sockets, high-end microwave components, and much, much more! If you have these items to sell, email us your list! (Photos helpful)
***NOTE: The President's page section (below) will remain in operation while our new online catalogs are being prepared, and after completion to some degree.
Interested in great deals on vacuum variable capacitors, ceramic transmitting tubes, vacuum relays, roller inductors, test equipment, and more? From time to time all of these items can be found on These President's pages:
Max-Gain Systems, Inc. also buys and sells vacuum variable capacitors (by Jennings, Aperex, and Dolinko & Wilkins, Inc.), vacuum relays (by Jennings, Kilovac, and Torr), KNOWN GOOD RF transmitting tubes (both ceramic and glass), variable inductors (both roller inductors and wiping contact types), and RF wattmeters and slugs by Bird, Struthers, and others. If you have any of these types of items to sell, (vacuum variable capacitors, vacuum relays, "doorknob" capacitors, variable inductors, or transmitting tubes ), either new, or good used stock, please state description, condition, and price by email or post. We are also interested in purchasing your non-working Racal RA-6790GM receivers to increase our parts inventories. Again, please state condition and price.
DC motors -- We have a large inventory of 26 volt DC, multi-pole, high quality, mil-spec motors at rock-bottom prices. Inquire by email.
Presenting the best ham-radio related links page on the planet! (At least WE think so!) The gang at Max-Gain has surfed the web for thousands of hours in search of the best ham radio sites. Here is a list of the best of the best. If you follow these links, you should be able to find the answer to any question you might have --as long as it's related to ham radio---the greatest hobby on earth! Our links will let you find the answer fast without having to be away from the radio too long. Links to this site are invited and are very much appreciated! If you are a webmaster, or if you have a personal webpage, all we ask is that you link to this main index page, and not one of our side pages. URL's of the side pages are subject to change, but will always be accessible from this main MGS index page. Thank you!
This list of page URL's is a partial listing of page URLs within our website. If any of the links above or drop-down menus do not work for any reason, this will allow direct access to the associated "most popular" pages.
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Connectors & Adapters: Main Connector & Adapter List (DON'T MISS!)
Our customers have told us that the following terms have legitimately helped them find us, and the products that we index and sell on this page. If you have an idea of another term you were looking for where that need would be legitimately satisfied by goods indexed or found on this page only, please let us know. Please be very selective in suggesting additional terms for this section. We want potential customers to be able to quickly and easily find us, but under no circumstances do we want to "spam" anyone with unrelated search results!
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