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 7K7 $5.00 Sylvania 130% diodes 120% / 120% 1300 / 1000Gm NOS (OB) Loktal - green lettering
1 7K7 $5.00 Sylvania 120% diodes 120% / 120% 1300 / 1000Gm NOS (OB) Loktal - green lettering - damaged box
1 7K7 $5.00 Sylvania 120% diodes 120% / 120% 1250 / 1000Gm NOS (OB) Loktal - green lettering
1 7K7 $5.00 Sylvania 110% diodes 120% / 120% 1150 / 1000Gm NOS (OB) Loktal - green lettering
1 7K7 $5.00 Sylvania 130% diodes 120% / 120% 1400 / 1000Gm NOS (OB) Loktal - green lettering
1 7K7 $5.00 Sylvania 120% diodes 120% / 120% 1300 / 1000Gm NOS (OB) Loktal - green lettering
1 7K7 $5.00 Sylvania 120% diodes 120% / 120% 1300 / 1000Gm NOS (OB) Loktal - green lettering
1 7K7 $5.00 National Union 130% diodes 120% / 120% 1400 / 1000Gm NOS (OB) Loktal
1 7K7 $5.00 National Union 130% diodes 120% / 120% 1300 / 1000Gm NOS (OB) Loktal
1 7K7 $5.00 National Union 130% diodes 120% / 120% 1450 / 1000Gm NOS (OB) Loktal
1 7K7 $5.00 National Union 120% diodes 120% / 120% 1250 / 1000Gm NOS (OB) Loktal
1 7K7 $5.00 Philco 110% diodes 120% / 120% 1300 / 1000Gm NOS (OB) Loktal - damaged box
1 7K7 $5.00 RCA 110% diodes 120% / 120% 1100 / 1000Gm NOS (OB) Loktal - silver lettering
1 7K7 $5.00 RCA 130% diodes 120% / 120% 1400 / 1000Gm NOS (OB) Loktal - silver lettering
1 7K7 $5.00 RCA 120% diodes 120% / 120% 1200 / 1000Gm NOS (OB) Loktal - silver lettering
1 7K7 $5.00 RCA 120% diodes 120% / 120% 1350 / 1000Gm NOS (OB) Loktal - red lettering
1 7K7 $5.00 Ken-Rad 130% diodes 120% / 120% 1300 / 1000Gm NOS (OB) Loktal
1 7K7 $5.00 GE 120% diodes 120% / 120% 1350 / 1000Gm NOS (OB) Loktal - sealed in box
1 7L7 $2.00 Philco 140% 2300 / 2000Gm NOS (OB) Loktal - sealed in box
1 7L7 $2.00 Philco 120% 2100 / 2000Gm NOS (OB) Loktal - sealed in box
1 7L7 $2.00 Philco 120% 2200 / 2000Gm NOS (OB) Loktal - sealed in box
1 7L7 $2.00 Philco 130% 2300 / 2000Gm NOS (OB) Loktal - sealed in box
1 7L7 $2.00 Philco 120% 2250 / 2000Gm NOS (OB) Loktal - sealed in box
1 7L7 $2.00 Philco 140% 2750 / 2000Gm NOS (OB) Loktal - sealed in box
1 7L7 $2.00 Philco 130% 2600 / 2000Gm NOS (OB) Loktal - sealed in box - minor corrosion on base
1 7L7 $2.00 Philco 140% 3000 / 2000Gm NOS (OB) Loktal - sealed in box - damaged box
1 7L7 $2.00 Raytheon 130% 2400 / 2000Gm NOS (OB) Loktal - sealed in box
1 7L7 $2.00 Raytheon 140% 2300 / 2000Gm NOS (OB) Loktal
1 7L7 $2.00 GE 140% 2600 / 2000Gm NOS (OB) Loktal - white lettering - damaged box
1 7L7 $2.00 GE 130% 2250 / 2000Gm NOS (OB) Loktal - white lettering
1 7L7 $2.00 GE 130% 2400 / 2000Gm NOS (OB) Loktal - white lettering
1 7L7 $2.00 GE 140% 2400 / 2000Gm NOS (OB) Loktal - white lettering
1 7L7 $2.00 Sylvania 140% 2500 / 2000Gm NOS (OB) Loktal - green lettering
1 7L7 $2.00 Sylvania 130% 2400 / 2000Gm NOS (OB) Loktal - green lettering
1 7L7 $2.00 Sylvania 130% 2250 / 2000Gm NOS (OB) Loktal - green lettering - US Army
1 7L7 $2.00 Zenith 140% 2500 / 2000Gm NOS (OB) Loktal
1 7L7 $2.00 National Union 140% 3000 / 2000Gm NOS (OB) Loktal - damaged box
1 7L7 $2.00 Natioanl Union 140% 2900 / 2000Gm NOS (OB) Loktal
1 7L7 $2.00 Natioanl Union 140% 2500 / 2000Gm NOS (OB) Loktal
1 7L7 $2.00 National Union 130% 2400 / 2000Gm NOS (OB) Loktal
1 7L7 $2.00 Hytron untested sealed in box NOS (OB) Loktal - sealed in box
1 7L7 $2.00 Hytron untested sealed in box NOS (OB) Loktal - sealed in box
1 7L7 $1.00 Sylvania 130% 2200 / 2000Gm used (rb) Loktal - green lettering
1 7L7 $0.50 Raytheon 90% 1500 / 2000Gm used (OB) Loktal
1 7N7 $10.00 RCA 110% / 120% 2400 / 2600Gm NOS (OB) Loktal - silver lettering - black coat
1 7N7 $10.00 GE 120% / 120% 2500 / 2600Gm NOS (OB) Loktal - white lettering - angled square black plates
1 7N7 $10.00 GE 120% / 120% 2600 / 2700Gm NOS (OB) Loktal - white lettering - angled square black plates
1 7N7 $10.00 GE 120% / 120% 2600 / 2700Gm NOS (OB) Loktal - white lettering - angled square black plates
1 7N7 $10.00 RCA 120% / 120% 2400 / 2600Gm NOS (OB) Loktal - silver lettering - angled square black plates
1 7N7 $10.00 RCA 120% / 120% 2400 / 2600Gm NOS (OB) Loktal - silver lettering - angled square black plates
1 7N7 $10.00 RCA 120% / 120% 2550 / 2700Gm NOS (OB) Loktal - silver lettering - angled square black plates
1 7N7 $10.00 National Union 140% / 120% 3000 / 2600Gm NOS (OB) Loktal - torn box flap - angled square black plates
1 7N7 $10.00 CBS 125% / 120% 2600 / 2500Gm NOS (OB) Loktal - torn box flap - angled square black plates
1 7N7 $10.00 CBS 120% / 120% 2500 / 2500Gm NOS (OB) Loktal - angled square black plates
1 7N7 $10.00 CBS 130% / 130% 2800 / 2800Gm NOS (OB) Loktal - angled square black plates
1 7N7 $10.00 Philco 125% / 130% 2500 / 2600Gm NOS (OB) Loktal - angled square black plates
1 7N7 $10.00 Tung-Sol 130% / 120% 2650 / 2500Gm NOS (OB) Loktal - angled square black plates
1 7N7 $10.00 Tung-Sol 110% / 120% 2150 / 2400Gm NOS (OB) Loktal - angled square black plates
1 7N7 $10.00 Westinghouse 120% / 120% 2600 / 2500Gm NOS (OB) Loktal - angled square black plates
1 7N7 $10.00 Raytheon 120% / 115% 2600 / 2600Gm NOS (OB) Loktal - angled square black plates
1 7N7 $10.00 Raytheon 120% / 120% 2400 / 2450Gm NOS (OB) Loktal - angled square black plates
1 7N7 $10.00 Raytheon 120% / 120% 2750 / 2700Gm NOS (OB) Loktal - angled square black plates
1 7N7 $10.00 Raytheon 120% / 120% 2500 / 2500Gm NOS (OB) Loktal - angled square black plates
1 7N7 $10.00 Raytheon 120% / 120% 2500 / 2500Gm NOS (OB) Loktal - missing box flap - angled square black plates
1 7N7 $5.00 Sylvania 110% / 140% 2600 / 3000Gm used (rb) Loktal - black coat - green lettering
1 7N7 $5.00 Sylvania 120% / 120% 2700 / 2700Gm used (rb) Loktal - black coat - US Navy
1 7N7 $5.00 Sylvania 120% / 120% 2600 / 2650Gm used (rb) Loktal - yellow lettering - angled square black plates
1 7N7 $5.00 unknown 110% / 110% 2250 / 2300Gm used (L) Loktal - angled square black plates
1 7N7 $5.00 unknown 140% / 140% 2900 / 3000Gm used (L) Loktal - straight square black plates
1 7N7 $5.00 Sylvania 110% / 110% 2450 / 2500Gm used (L) Loktal - straight square black plates
1 7N7 $5.00 unknown 130% / 130% 2400 / 2200Gm used (L) Loktal - straight square black plates

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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