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Loktal Radio Tube Store


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Loktal tubes were designed for mobile radio use. The proper name is "Loktal" although the name is sometimes misspelled as "loctal" since "Loktal" doesn't look like the right spelling. The tubes "lock" into the socket via a spring clamp around the locator pin.

Often the tubes will have a black coating on the pins. This is not as bad as it seems. The pins are coated with silver to provide a better contact, but silver oxidizes with age which is the cause of the black color. Silver oxide is still conductive, although not as conductive as unoxidized silver.

Loktals had a short production life. Sylvania created them in 1938 as an alternative to the octal base tubes from RCA. By 1947 the tubes had fallen from favor. Probably the biggest cause of the failure was the difficulty of removing the tube from the socket because of the locking spring. This often resulted in scraped knuckles. Sometimes the tube base would remain behind still in the socket because the glue bond broke. Since the only locator indication on the tube is the base locator, that made it very difficult to figure out how to orient the tube to reglue it into the base. Generally it ment the tube was thrown out even if it was otherwise good.

The real death of the Loktals was probably driven by the rise of the 7 and 9 pin miniature tubes. They allowed manufacturers to make smaller radios, and since the miniature tubes didn't have a separate base, they were cheaper to make. Repairmen liked them because they were easier to replace and took up less storage space.

Like metal tubes, Loktal tubes were a good idea that didn't work out in real life.

Loktal Radio Tubes

Loktal Radio Tubes

Type: 7A4, XXL, VT-192, 7A5, 7A6, 5679, 7AD7, 6145, 7AF7, 7AG7, 7AH7, 7AK7
Type: 7A7, 7A8
Type: 7B4, 7B5, 7B6, 7B7
Type: 7B8, 7C4, 1203, VT-243, 7C5
Type: 7C6, 7C7, VT-193, 1273, 7E5, 1201, VT-241
Type: 7E6, VT-188, 7E7, 7H7, VT-190, 7J7
Type: 7F7, VT-189, 7F8, 7G7, 1232, 7G8, 1206
Type: 7K7, 7L7, 7N7
Type: 7Q7, 7R7, 7T7, 7V7, 1231, 7W7
Type: 5AZ4, 7X6, 7X7, XXFM, 7Y4, 7Z4
Type: 14A4, 14A5, 14A7, 12B7, 14AF7, XXD, 14B6, 14B8, 14C5, 14E6, 14E7, 14F7, 14F8, 14W7, 14Y4
Type: 14C7, 1280, 14H7, 14J7, 14Q7, 14R7, 14S7, 14X7
Type: 35A5, 35Y4, 35Z3
Type: 50A5, 50X6


How To Order:

Purchasing our Radio tubes is easy.
Click on the desired link above to find the tubes you need.
Then just send us an email indicating the tubes (including quantities) you want.
We will let you know the total price including shipping and handling.

Shipping and Handling Information

Contact MDB Ventures
sales@mdbventures.com
or
sales@fourwater.com

Due to the highly volatile nature of the tube business, all Prices are subject to change without notice.


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Contact MDB Ventures
sales@mdbventures.com
or
sales@fourwater.com