MDB Ventures Radio Loktal Tubes


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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 7B4 $5.00 RCA 140% 1200 / 1000Gm used (rb) Loktal - silver lettering
1 7B4 $5.00 RCA 140% 1500 / 1000Gm used (rb) Loktal - silver lettering
1 7B4 $5.00 Zenith 140% 1150 / 1000Gm used (rb) Loktal
1 7B4 $5.00 National Union 110% 900 / 1000Gm used (rb) Loktal
1 7B4 $5.00 Sylvania 130% 1100 / 1000Gm used (rb) Loktal - green lettering - JAN
1 7B4 $2.50 Zenith 100% 800 / 1000Gm used (rb) Loktal
1 7B4 $15.00 GE 140% 1200 / 1000Gm NOS (OB) Loktal - white lettering
1 7B5 $3.00 Philco 130% 2000 / 1600Gm NOS (OB) Loktal
1 7B5 $3.00 Philco 130% 2000 / 1600Gm NOS (OB) Loktal - sealed in box
1 7B5 $3.00 Philco 110% 2000 / 1600Gm NOS (OB) Loktal
1 7B5 $3.00 Tung-Sol 130% 2100 / 1600Gm NOS (OB) Loktal
1 7B5 $3.00 National Union 130%2000 / 1600Gm NOS (OB) Loktal
1 7B5 $3.00 Delco 130% 2200 / 1600Gm NOS (OB) Loktal
1 7B5 $3.00 Raytheon 120% 2100 / 1600Gm NOS (OB) Loktal - sealed in box
1 7B5 $3.00 GE 135% 2200 / 1600Gm NOS (OB) Loktal - orange lettering
1 7B5 $3.00 GE 130% 2200 / 1600Gm NOS (OB) Loktal - white lettering
1 7B5 $3.00 GE 120% 1900 / 1600Gm NOS (OB) Loktal - white lettering
1 7B5 $3.00 GE 120% 2000 / 1600Gm NOS (OB) Loktal - sealed in box
1 7B5 $3.00 GE 130% 2200 / 1600Gm NOS (OB) Loktal - red lettering - torn box flap
1 7B5 $3.00 GE 120% 2000 / 1600Gm NOS (OB) Loktal - sealed in box
1 7B5 $3.00 Sylvania 120% 2200 / 1600Gm NOS (OB) Loktal - yellow lettering
1 7B5 $3.00 Sylvania 130% 2200 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 130% 2000 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 130% 2200 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 130% 2100 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 120% 2000 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 130% 2100 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 130% 2200 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 140% 2100 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 130% 2100 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 120% 1900 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 130% 2100 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 120% 2000 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 140% 2200 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $3.00 Sylvania 130% 2200 / 1600Gm NOS (OB) Loktal - green lettering
1 7B5 $1.50 Sylvania 120% 2000 / 1600Gm used (rb) Loktal - green lettering
1 7B5 $1.50 Sylvania 130% 2100 / 1600Gm used (rb) Loktal - yellow lettering
1 7B5 $1.50 Sylvania 130% 2500 / 1600Gm used (rb) Loktal - yellow lettering
1 7B5 $1.50 Philco 130% 2200 / 1600Gm used (rb) Loktal
1 7B5 $1.50 Philco 120% 1900 / 1600Gm used (rb) Loktal
1 7B5 $1.50 National Union 120% 2100 / 1600Gm used (rb) Loktal - yellow lettering
1 7B5 $1.50 CBS 110% 1900 / 1600Gm used (rb) Loktal
1 7B5 $1.50 Silvertone 120% 2000 / 1600Gm used rb) Loktal
1 7B5 $1.00 Sylvania 100% 1800 / 1600Gm used (rb) Loktal - yellow lettering
1 7B5 $1.00 Sylvania 100% 1800 / 1600Gm used (rb) Loktal - green lettering
1 7B5 $1.00 unknown 120% 1900 / 1600Gm used (rb) Loktal
1 7B5 $1.50 unknown 120% 500 / 1600Gm used (rb) Loktal
1 7B6 $4.00 National Union 110% diodes: 110% / 110% 1000 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Philco 110% diodes: 120% / 120% 900 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Philco 120% diodes: 120% / 120% 1000 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Philco 110% diodes: 120% / 120% 850 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Philco 120% diodes: 110% / 120% 900 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Philco 130% diodes: 110% / 120% 1200 / 750Gm NOS (OB) Loktal - sealed in box - damaged box
1 7B6 $4.00 Philco 140% diodes: 110% / 120% 1300 / 750Gm NOS (OB) Loktal - sealed in box
1 7B6 $4.00 Delco 110% diodes: 110% / 110% 900 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Delco 110% diodes: 110% / 110% 900 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Zenith 110% diodes: 110% / 110% 850 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Admiral 120% diodes: 120% / 120% 1000 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 National Union 140% diodes: 120% / 120% 900 / 750Gm NOS (OB) Loktal - damaged box
1 7B6 $4.00 Natioanl Union 120% diodes: 120% / 120% 1000 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Raytheon 110% diodes: 110% / 110% 1000 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Raytheon 110% diodes: 110% / 120% 950 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Raytheon 140% diodes: 110% / 110% 1000 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Raytheon 110% diodes: 120% / 120% 1000 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 Raytheon 120% diodes: 120% / 120% 1000 / 750Gm NOS (OB) Loktal
1 7B6 $4.00 RCA 140% diodes: 120% / 120% 1100 / 750Gm NOS (OB) Loktal - silver lettering
1 7B6 $4.00 RCA 120% diodes: 110% / 110% 1000 / 750Gm NOS (OB) Loktal - red lettering
1 7B6 $4.00 Sylvania 120% diodes: 120% / 120% 1100 / 750Gm NOS (OB) Loktal - green lettering
1 7B6 $4.00 Sylvania 110% diodes: 110% / 110% 850 / 750Gm NOS (OB) Loktal - green lettering
1 7B6 $4.00 Sylvania 110% diodes: 110% / 110% 950 / 750Gm NOS (OB) Loktal - green lettering
1 7B6 $2.00 Sylvania 110% diodes: 110% / 110% 850 / 750Gm used (rb) Loktal - green lettering
1 7B6 $2.00 Sylvania 110% diodes: 110% / 110% 1000 / 750Gm used (rb) Loktal - yellow lettering
1 7B6 $2.00 RCA 110% diodes: 120% / 120% 950 / 750Gm used (rb) Loktal - silver lettering
1 7B6 $2.00 Philco 110% diodes: 110% / 90% 850 / 750Gm used (rb) Loktal
1 7B6 $2.00 Philco 120% diodes: 110% / 110% 850 / 750Gm used (rb) Loktal
1 7B6 $2.00 Philco 110% diodes: 110% / 120% 1000 / 750Gm used (rb) Loktal
1 7B6 $2.00 Philco 110% diodes: 120% / 110% 900 / 750Gm used (rb) Loktal
1 7B6 $2.00 GM 120% diodes: 110% / 120% 900 / 750Gm used (rb) Loktal
1 7B6 $2.00 Raytheon 110% diodes: 120% / 120% 1000 / 750Gm used (rb) Loktal
1 7B6 $1.00 GM 100% diodes: 110% / 120%950 / 750Gm used (rb) Loktal
1 7B6 $1.00 Delco 100% diodes: 110% / 110%950 / 750Gm used (wb) Loktal
1 7B6 $1.00 Zenith 100% diodes: 110% / 120% 950 / 750Gm used (rb) Loktal
1 7B6 $0.50 Raytheon 90% diodes: 110% / 110% 700 / 750Gm used (rb) Loktal
1 7B7 $15.00 Raytheon 140% 2300 / 1700Gm NOS (OB) Loktal
1 7B7 $5.00 Sylvania 130% 2100 / 1700Gm used (rb) Loktal - green lettering
1 7B7 $5.00 Sylvania 110% 1650 / 1700Gm used (rb) Loktal - green lettering
1 7B7 $5.00 GE 115% 2000 / 1700Gm used wb) Loktal - white lettering
1 7B7 $5.00 GE 130% 2250 / 1700Gm used (rb) Loktal - white lettering
1 7B7 $5.00 Philco 110% 1850 / 1700Gm used (rb) Loktal
1 7B7 $5.00 Silvertone 110% 1900 / 1700Gm used (rb) Loktal
1 7B7 $5.00 Ken-Rad 130% 2200 / 1700Gm used (rb) Loktal
1 7B7 $5.00 Emerson 140% 2150 / 1700Gm used (rb) Loktal
1 7B7 $5.00 Emerson 120% 1900 / 1700Gm used (wb) Loktal
1 7B7 $1.00 unknown 100% 1600 / 1700Gm used (rb) 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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