MDB Ventures Industrial, Ham Radio Transmitter and Power 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.

MDB Ventures Industrial, Ham Radio Transmitter and Power Tubes
Qty
Avail
Tube
Type
Price
Each
Tube
Brand
Emission
Strength
Mutual
Conduct

Desc

Notes
1 1N1239 $10.00 unknown (usa) 140% / 140% --- used (L) solid state 5R4 (ideal for Collins 516-FR) 2800V 1Amp (tx2)
1 3B28 $10.00 Tung-Sol 110% --- NOS (ob) box end flap missing - cat:401-388 (tx2)
1 3B28 $10.00 Chatham 115% --- NOS (OB) JAN (tx2)
1 3B28 $10.00 United Electronics 120% --- NOS (wb) JAN (tx2)
1 3B28 $10.00 Electronics Enterprises 120% --- NOS (wb) JAN (tx2)
1 3B28 $10.00 Electronics Enterprises 120% --- NOS (wb) --- (tx2)
1 3B28 $10.00 Cetron 120% --- NOS (OB) JAN - cat:401-384 - water damaged box (tx2)
1 GXU1 / 3B28 / CV1835 $20.00 Zaerix 110% --- NOS (OB) cat:401-389-2 (tx2)
1 GXU1 / 3B28 / CV1835 $20.00 Zaerix 130% --- NOS (wb) cat:401-389-7 (tx2)
1 GXU1 / 3B28 / CV1835 $20.00 Zaerix 130% --- NOS (wb) cat:401-389-1 (tx2)
1 GXU1 / 3B28 / CV1835 $20.00 Zaerix 130% --- NOS (wb) cat:401-389-3 (tx2)

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, (A)=Acorn, (N)=Nuvistor, (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 Industrial, Ham Radio Transmitter and Power 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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Contact MDB Ventures
sales@mdbventures.com
or
sales@fourwater.com