MDB Ventures Low Grade Tubes


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Save on low grade tubes!

Some tubes fail testing because they have a weak output, are leaky, or have a minor defect such as a missing cap. These tubes can still be usable to experimenters, as backup tubes, or in an undemanding service may still operate as well as a new tube. We offer them here at a reduced price.

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, miniature, subminiature, metal, power, transmitter tubes and many more.

MDB Ventures Low Grade Tubes
Qty
Avail
Tube
Type
Price
Each
Tube
Brand
Emission
Strength
Mutual
Conduct

Desc

Notes
1 2E25A $0.50 Hytron untested --- used (L) brown base (cat:g1)
1 3B29 $0.50 Raytheon untested --- used (L) brown base - some minor corrosion on pins and cap (cat:g1)
1 5AS4A $5.00 Sylvania 100% / 100% --- used good (OB) (GB) burned pin
1 5U4-GB / 5AS4A $6.00 GE 75% / 70% --- used fair (L) (GT)
1 5U4-GB / 5AS5A $3.00 GE 55% / 90% --- used weak (L) (GT)
1 5U4-GB $8.00 Hoffman 105% / 105% --- used good (L) (GT) particles inside
1 5U4-GB $8.00 Magnavox 110% / 110% --- used good (L) (GT) cracked base
1 5U4-GB $8.00 GE 110% / 105% --- used good (L) (GT) particles inside
1 5U4-GB $17.00 RCA 100% / 100% --- used good (L) (GT) particles inside
1 5U4-GB $17.00 RCA 100% / 100% --- used good (L) (GT) particles inside
1 5U4-GB $17.00 RCA 100% / 100% --- used good (L) (GT) particles inside
1 5U4-GB $19.00 RCA 105% / 105% --- used good (L) (GT) white particles inside
1 5U4-GB $19.00 RCA 105% / 105% --- used good (L) (GT) particles inside
1 5U4-GB $19.00 RCA 105% / 105% --- used good (L) (GT) particles inside
1 5U4-GB $14.00 RCA 95% / 90% --- used good (L) (GT) particles inside
1 5U4-GB $10.00 RCA 80% / 75% --- used fair (L) (GT)
1 5U4-G $10.00 Westinghouse 95% / 95% --- used good (L) (ST) white particles inside (cat:G1)
1 5U4-G $10.00 Emerson 100% / 100% --- used good (L) (ST) white particles inside (cat:G1)
1 5U4-G $5.00 Emerson 85% / 80% --- used good (L) (ST) white particles inside (cat:G1)
1 5U4-G $5.00 unknown 100% / 100% --- used good (L) (ST) broken locator pin (cat:G1)
1 5U4-G $2.00 Admiral 90% / 90% --- used gassy (L) (ST) gassy (cat:G1)
1 5U4-G $10.00 RCA 70% / 70% --- used fair (L) (ST) (cat:G1)
1 5U4-G $10.00 RCA 80% / 75% --- used fair (L) (ST) (cat:G1)
1 5U4-G $10.00 RCA 75% / 75% --- used fair (L) (ST) (cat:G1)
1 5U4-G $10.00 RCA 70% / 90% --- used fair (L) (ST) (cat:G1)
1 6BD4A $0.25 RCA untested --- used (L) --- (cat:g1)
1 6BG6-G $1.00 Emerson 100% 6000 / 6000Gm used (L) (ST) loose cap (cat:G1)
1 6BG6-GA $1.00 GE 70% 4000 / 6000Gm used (L) (GT) Grid Clip - Dual Side Getters - White Lettering (cat:G1)
1 6BY5GA $2.00 Raytheon 120% / 120% --- used leaky (300k) (L) (ST) (cat:G1)
1 6BY5GA $1.00 Cornell 80% / 140% --- used leaky (750k) (L) (ST) (cat:G1)
1 12G-B3 $1.00 Ten untested --- used (L) grid clip - dual top halo getters (cat:g1)
1 25A6-G $12.00 Philco 110% 2800 / 2300Gm used leaky (50K ohm) (L) (ST) engraved base (cat:G1)
1 25A6-G $12.00 Wards Super Airline 30% 1500 / 2300Gm used (L) (ST) (cat:G1)
1 25A6-G $12.00 Philco 110% 2700 / 2300Gm used leaky (50K ohm) (L) (ST) engraved base - loose base (cat:G1)
1 25A6-G $12.00 Zenith 100% 2800 / 2300Gm used leaky (750K ohm) (L) (ST) engraved base (cat:G1)
1 25A7-G $0.50 National Union 85% Diode: 5% 2000 / 1800Gm used (L) (ST) loose base - engraved base - clear glass (cat:G1)
1 25L6-G $5.00 Raytheon 100% 8000 / 8000Gm used leaky (2M ohm) (L) (ST) fat bulb - clear glass (cat:G1)
1 25L6-G $5.00 National Union 115% 10000 / 8000Gm used leaky (3M ohm) (L) (ST) fat bulb - clear glass (cat:G1)
1 25L6-G $5.00 Ken-Rad 80% 6000 / 8000Gm used leaky (300K ohm) (L) (ST) fat bulb - blak coat (cat:G1)
1 25L6-G $5.00 Hytron 120% 9500 / 8000Gm used leaky (2M ohm) (L) (ST) fat bulb - clear glass (cat:G1)
1 25L6-G $5.00 Zenith 120% 10000 / 8000Gm used leaky (50K ohm) (L) (ST) fat bulb - gray coat - engraved base (cat:G1)
1 25L6-G $5.00 GE 115% 11000 / 8000Gm used leaky (1M ohm) (L) (ST) fat bulb - gray coat (cat:G1)
1 25L6-G $5.00 RCA 120% 10500 / 8000Gm used leaky (500K ohm) (L) (ST) fat bulb - gray coat (cat:G1)
1 25L6-G $5.00 National Union 110% 11000 / 8000Gm used leaky (750K ohm) (L) (ST) fat bulb - gray coat (cat:G1)
1 25L6-G $5.00 Zenith 120% 12000 / 8000Gm used (L) (ST) fat bulb - gray coat - intermittent grid short (cat:G1)
1 25L6-G $5.00 Tung-Sol 135% 12500 / 8000Gm used leaky (50K ohm) (L) (ST) skinny bulb - black coat (cat:G1)
1 25L6-G $5.00 Champion 110% 10500 / 8000Gm used leaky (1M ohm) (L) (ST) skinny bulb - gray coat (cat:G1)
1 25L6-G $5.00 Champion 110% 11500 / 8000Gm used leaky (3M ohm) (L) (ST) skinny bulb - black coat (cat:G1)
1 25L6-G $5.00 Champion 120% 11500 / 8000Gm used leaky (2M ohm) (L) (ST) skinny bulb - gray coat (cat:G1)
1 25L6-G $5.00 GE 130% 8000 / 8000Gm used leaky (250K ohm) (L) (ST) skinny bulb - gray coat (cat:G1)
1 28D7 $1.00 Sylvania 110% / 120% --- used (ob) (ST) intermitent - JAN (cat:G1)
1 35Z5-GT / G $5.00 Raythoen 100% --- used leaky (3M ohm) (L) (TT) tall tubular bulb (cat:G1)
1 35Z5-G $5.00 Zenith 100% --- used leaky (2M ohm) (L) (ST) (cat:G1)
1 35Z5-G $5.00 National Union 75% --- used fair (L) (ST) (cat:G1)
1 50Z7-G $0.50 Zenith --- --- used heater 1 / 2 open (L) (ST) (cat:G1)

Notes: ST=ST Style, GT=GT Style, GL=Globe/Balloon Style, MT=Metal Style,
MN=Miniature(7/9pin) Style, SM=Subminature Style
EN=Engraved Base, CB=Cracked Base, LB=Loose Base, LC=Loose Cap, MC=Missing Cap, 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
(Gm = measured/baseline, measured1:measured2/baseline, measured1:measured2/baseline1:baseline2).
DMC = Mutual conductance measured on B&K 747 tube tester.
(DMC<55:weak, DMC55<>65:fair, DMC>65:good, DMC>40=diode good).


How to Order:

Purchasing our bargain bin 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


We cannot guarantee our Bargain Bin tubes. All sales of our Bargain Bin tubes are final.

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