Don't see what you need? Contact us. We have many more tubes that are not yet listed.
We also have new and good used tubes in most other numbers including preoctal, globe/balloon,
octal, loctal/loktal, miniature, subminature, metal, power, transmitter tubes and many more.
Loktal tubes were designed by Sylvania in 1938 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.
MDB Ventures Loktal Radio Tubes
Qty
Avail | Tube
Type | Price
Each | Tube
Brand | Emission
Strength | Mutual
Conduct |
Desc |
Notes
|
|
| 1 | 7B8 | $3.00 | RCA | 120% / 130% | 1700 / 1000:1100 / 500Gm | NOS (OB) | Loktal - silver lettering |
| 1 | 7B8 | $3.00 | RCA | 130% / 130% | 1200 / 1000:800 / 500Gm | NOS (OB) | Loktal - red lettering |
| 1 | 7B8 | $3.00 | RCA Victor | 130% / 130% | 1800 / 1000:1100 / 500Gm | NOS (OB) | Loktal - missing box flap |
| 1 | 7B8 | $3.00 | Raytheon | 130% / 130% | 1700 / 1000:1100 / 500Gm | NOS (OB) | Loktal |
| 1 | 7B8 | $3.00 | Tung-Sol | 110% / 130% | 1600 / 1000:1100 / 500Gm | NOS (OB) | Loktal |
| 1 | 7B8 | $3.00 | GE | 120% / 120% | 1500 / 1000:1000 / 500Gm | NOS (OB) | Loktal - white lettering |
| 1 | 7B8 | $3.00 | Hytron | untested | sealed in box | NOS (OB) | Loktal - Bantam Tube |
| 1 | 7B8 | $3.00 | Philco | 110% / 110% | 1500 / 1000:1100 / 500Gm | NOS (OB) | Loktal |
| 1 | 7B8 | $3.00 | Sylvania | 140% / 140% | 1600 / 1000:1100 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 140% / 140% | 1400 / 1000:1000 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 120% / 120% | 1500 / 1000:1100 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 110% / 120% | 1600 / 1000:1200 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 110% / 140% | 1300 / 1000:1000 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 110% / 130% | 1600 / 1000:1100 / 500Gm | NOS (OB) | Loktal - green lettering - damaged box |
| 1 | 7B8 | $3.00 | Sylvania | 110% / 140% | 1700 / 1000:1200 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 120% / 130% | 1800 / 1000:1200 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 110% / 130% | 1700 / 1000:1200 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 120% / 140% | 1800 / 1000:1100 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 120% / 120% | 1700 / 1000:1100 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 110% / 130% | 1700 / 1000:1200 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 120% / 140% | 1700 / 1000:1000 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 120% / 130% | 1700 / 1000:1100 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 110% / 140% | 1600 / 1000:1300 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 140% / 120% | 1600 / 1000:1000 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 130% / 140% | 1400 / 1000:1000 / 500Gm | NOS (OB) | Loktal - green lettering |
| 1 | 7B8 | $3.00 | Sylvania | 130% / 130% | 1800 / 1000:1200 / 500Gm | NOS (OB) | Loktal - yellow lettering |
| 1 | 7B8 | $3.00 | Sylvania | 140% / 120% | 1700 / 1000:1100 / 500Gm | NOS (OB) | Loktal - yellow lettering |
| 1 | 7B8 | $1.50 | Sylvania | 120% / 130% | 2000 / 1000:1300 / 500Gm | used (rb) | Loktal - green lettering |
| 1 | 7B8 | $1.50 | National Union | 110% / 120% | 1400 / 1000:1000 / 500Gm | used (rb) | Loktal |
| 1 | 7B8 | $1.50 | Philco | 110% / 130% | 1700 / 1000:1200 / 500Gm | used (rb) | Loktal |
| 1 | 7B8 | $1.50 | Philco | 120% / 110% | 1400 / 1000:1100 / 500Gm | used (rb) | Loktal |
| 1 | 7B8 | $1.00 | Raytheon | 100% / 120% | 1200 / 1000:1000 / 500Gm | used (rb) | Loktal |
| 1 | 7B8 | $1.00 | Philco | 100% / 100% | 1200 / 1000:900 / 500Gm | used (rb) | Loktal |
|
|
|
| 1 | VT-243 / 7C4 / 1203A | $3.00 | Philco | untested | sealed in box | NOS (OB) | Loktal - US Army |
| 1 | VT-243 / 7C4 / 1203A | $3.00 | Philco | untested | selaed in box | NOS (OB) | Loktal - US Army |
| 1 | 7C4 | $3.00 | GE | 110% | --- | NOS (OB) | Loktal - white lettering |
| 1 | 7C4 | $3.00 | GE | 110% | --- | NOS (OB) | Loktal - white lettering |
| 1 | 7C4 / 1203 | $3.00 | Tung-Sol | 110% | --- | NOS (OB) | Loktal - damaged box |
| 1 | 7C4 / 1203 | $3.00 | Tung-Sol | 120% | --- | NOS (OB) | Loktal |
| 1 | 7C4 / 1203A | $3.00 | Sylvania | 110% | --- | NOS (OB) | Loktal - green lettering |
| 1 | 7C4 / 1203A | $3.00 | Sylvania | 110% | --- | NOS (OB) | Loktal - green lettering |
| 1 | 7C4 / 1203A | $3.00 | Sylvania | 120% | --- | NOS (OB) | Loktal - green lettering |
| 1 | 7C4 / 1203A | $3.00 | Sylvania | 120% | --- | NOS (OB) | Loktal - green lettering |
| 1 | 7C4 / 1203A | $3.00 | Sylvania | 110% | --- | NOS (OB) | Loktal - green lettering |
| 1 | 7C4 / 1203A | $3.00 | Sylvania | 110% | --- | NOS (OB) | Loktal - green lettering |
| 1 | 7C4 / 1203A | $3.00 | Sylvania | 120% | --- | NOS (OB) | Loktal - green lettering |
| 1 | 7C4 / 1203A | $3.00 | Sylvania | 120% | --- | NOS (OB) | Loktal - green lettering |
| 1 | 7C4 / 1203A | $3.00 | Raytheon | 110% | --- | NOS (OB) | Loktal |
| 1 | 7C4 / 1203A | $3.00 | Raytheon | 110% | --- | NOS (OB) | Loktal |
| 1 | 7C4 / 1203A | $3.00 | Raytheon | 120% | --- | NOS (OB) | Loktal |
| 1 | 7C4 / 1203A | $3.00 | Philco | 120% | --- | NOS (OB) | Loktal |
| 1 | 7C4 / 1203A | $3.00 | National Union | 120% | --- | NOS (OB) | Loktal |
| 1 | 7C4 / 1203A | $3.00 | National Union | 110% | --- | NOS (OB) | Loktal |
| 1 | 1203A | $3.00 | National Union | untested | sealed in box | NOS (OB) | Loktal |
| 1 | 1203A | $3.00 | National Union | untested | sealed in box | NOS (OB) | Loktal |
| 1 | 7C4 / 1203A | $1.50 | Raytheon | 120% | --- | used (OB) | Loktal |
|
Notes:
(OB) = original box, (rb) = relabeled/replacement box, (wb) = white box,
(L) = loose (no box), (pl) = paper label on tube (original or third party)
(H) = tested on Hickok 539A
(ST)=ST Style, (GT)=GT Style, (TT)=Tall Tubular, (M7)=7pin miniature,
M9=9pin miniature, (SM)=subminiature, JAN = Military
Emission Strength = Percentage of emission measured on Eico 666 tube tester
(Emission Strength = 100% baseline reference, >80%:good, >60%:fair >40%=diode good).
Gm = Mutual conductance measured on Hickok 533 tube tester; Except (H)=tested on Hickok 539A
(Gm = measured/baseline, measured1:measured2/baseline, measured1:measured2/baseline1:baseline2).
How To Order:
Purchasing our Loktal Radio tubes is easy.
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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