MDB Ventures Low Grade Tubes

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Type: 5AS4 , 5U4 , 5U4-G , 25A6-G , 25A7-G , 25L6-G , 35Z5 , 50Z7-G

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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 Quantity Available Tube Type Price Each Tube Brand Emission Strength Mutual Conductance Description Notes 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 GE 100%/100% --- used good (L) (GT) white particles inside 1 5U4-GA $3.00 GE 60%/50% --- used fair (L) (GT) 1 5U4-GB $6.00 GE 90%/70% --- used fair (L) (GT) 1 5U4-GA/GB $3.00 GE 70%/50% --- used weak (L) (GT) 1 5U4-GA/GB $8.00 GE 80%/95% --- used fair (L) (GT) 1 5U4-GA $5.00 GE 60%/60% --- used fair (L) (GT) 1 5U4-GA/GB $5.00 GE 70%/60% --- used fair (L) (GT) 1 5U4-GA/GB $5.00 GE 60%/70% --- used fair (L) (GT) 1 5U4-GA/GB $3.00 GE 50%/75% --- used fair (L) (GT) 1 5U4-GA/GB $6.00 GE 75%/90% --- used fair (L) (GT) 1 5U4-GA/GB $8.00 GE 95%/95% --- used good (L) (GT) broken locator pin 1 5U4-GA $3.00 GE 50%/50% --- used weak (L) (GT) 1 5U4-GA/GB $5.00 GE 70%/60% --- used fair (L) (GT) 1 5U4-GA/GB $6.00 GE 80%/70% --- used fair (L) (GT) 1 5U4-GA/GB $6.00 GE 70%/70% --- used fair (L) (GT) 1 5U4-GB $5.00 GE 70%/65% --- used fair (L) (GT) 1 5U4-GB $6.00 GE 70%/75% --- used fair (L) (GT) 1 5U4-GB $5.00 GE 60%/75% --- used fair (L) (GT) 1 5U4-GB $8.00 GE 100%/100% --- used good (L) (GT) particles inside 1 5U4-GB $8.00 GE 110%/105% --- used good (L) (GT) particles inside 1 5U4-GA/GB $8.00 GE 105%/100% --- used good (L) (GT) particles inside 1 5U4-GB $6.00 GE 90%/70% --- used fair (L) (GT) 1 5U4-GB $8.00 GE 100%/110% --- used good (L) (GT) broken locator pin 1 5U4-GB $8.00 GE 110%/110% --- used good (L) (GT) broken locator pin 1 5U4-GB $8.00 GE 110%/105% --- used good (L) (GT) broken locator pin 1 5U4-GB $6.00 Westinghouse 75%/70% --- used fair (L) (GT) 1 5U4-GB $6.00 Westinghouse 70%/85% --- used fair (L) (GT) 1 5U4-GB $6.00 Westinghouse 75%/70% --- used fair (L) (GT) 1 5U4-GB $5.00 Westinghouse 65%/80% --- used fair (L) (GT) 1 5U4-GB $8.00 Westinghouse 100%/105% --- used good (L) (GT) broken locator pin 1 5U4-GB $8.00 Westinghouse 110%/110% --- used good (L) (GT) broken locator pin 1 5U4-GB $6.00 Tung-Sol 75%/80% --- used fair (L) (GT) 1 5U4-GB $6.00 Tung-Sol 70%/75% --- used fair (L) (GT) 1 5U4-GB $6.00 Tung-Sol 75%/80% --- used fair (L) (GT) 1 5U4-GB $5.00 Tung-Sol 60%/70% --- used fair (L) (GT) 1 5U4-GB $8.00 Tung-Sol 105%/105% --- used good (L) (GT) broken locator pin 1 5U4-GB $5.00 Olympic 60%/60% --- used fair (L) (GT) 1 5U4-GB $8.00 Hoffman 105%/105% --- used good (L) (GT) particles inside 1 5U4-GB $8.00 Dumont 100%/100% --- used good (L) (GT) particles inside 1 5U4-GB $6.00 Dumont 75%/85% --- used fair (L) (GT) 1 5U4-GB $5.00 Sylvania 65%/75% --- used fair (L) (GT) 1 5U4-GB $8.00 Sylvania 100%/100% --- used good (L) (GT) particles inside 1 5U4-GB $6.00 Sylvania 70%/70% --- used fair (L) (GT) 1 5U4-GB $5.00 Sylvania 60%/60% --- used fair (L) (GT) 1 5U4-GB $3.00 Sylvania 50%/50% --- used weak (L) (GT) 1 5U4-GB $6.00 Sylvania 75%/90% --- used fair (L) (GT) 1 5U4-GB $6.00 Sylvania 70%/70% --- used fair (L) (GT) 1 5U4-GB $3.00 Sylvania 55%/70% --- used weak (L) (GT) 1 5U4-GB $5.00 Sylvania 70%/60% --- used fair (L) (GT) 1 5U4-GB $6.00 Sylvania 75%/70% --- used fair (L) (GT) 1 5U4-GB $6.00 Sylvania 90%/70% --- used fair (L) (GT) 1 5U4-GB $8.00 Sylvania 110%/105% --- used good (L) (GT) broken locator pin 1 5U4-GB $8.00 Sylvania 110%/110% --- used good (L) (GT) broken locator pin 1 5U4-GB $8.00 Sylvania 110%/110% --- used good (L) (GT) broken locator pin 1 5U4-GB $8.00 Sylvania 95%/95% --- used good (L) (GT) broken locator pin 1 5U4-GB $8.00 Sylvania 105%/105% --- used good (L) (GT) broken locator pin 1 5U4-GB $8.00 Sylvania 100%/100% --- used good (L) (GT) broken locator pin 1 5U4-GB $6.00 IBM 70%/90% --- used fair (L) (GT) 1 5U4-GB $6.00 IBM 70%/80% --- used fair (L) (GT) 1 5U4-GB $2.00 IBM 50%/50% --- used weak (L) (GT) 1 5U4-GB $6.00 IBM 75%/85% --- used fair (L) (GT) 1 5U4-GB $2.00 IBM 70%/50% --- used weak (L) (GT) 1 5U4-GB $2.00 IBM 50%/50% --- used weak (L) (GT) 1 5U4-GB $6.00 IBM 70%/70% --- used fair (L) (GT) 1 5U4-GB $6.00 IBM 70%/70% --- used fair (L) (GT) 1 5U4-GB $6.00 Zenith 75%/80% --- used fair (L) (GT) 1 5U4-GB $5.00 Zenith 65%/60% --- used fair (L) (GT) 1 5U4-GB $6.00 Zenith 100%/70% --- used fair (L) (GT) 1 5U4-GB $8.00 Zenith 100%/100% --- used good (L) (GT) broken locator pin 1 5U4-GB $6.00 Admiral 80%/70% --- used fair (L) (GT) 1 5U4-GB $8.00 Philco 90%/80% --- used fair (L) (GT) 1 5U4-GB $8.00 Philco 90%/90% --- used good (L) (GT) broken locator pin 1 5U4-GB $8.00 Philco 100%/100% --- used leaky (L) (GT) 1 5U4-GB $6.00 Raytheon 75%/70% --- used fair (L) (GT) 1 5U4-GB $3.00 Raytheon 90%/50% --- used weak (L) (GT) 1 5U4-GB $6.00 Raytheon 70%/90% --- used fair (L) (GT) broken locator pin 1 5U4-GB $6.00 Wards Super Airline 70%/85% --- used fair (L) (GT) 1 5U4-GB $3.00 Motorola 80%/60% --- used fair (L) (GT) 1 5U4-GB $8.00 Motorola 105%/105% --- used good (L) (GT) broken locator pin 1 5U4-GB $8.00 CBS 90%/95% --- used good (L) (GT) paint on tube 1 5U4-GB $8.00 Magnavox 110%/110% --- used good (L) (GT) cracked base 1 5U4-GB $5.00 Magnavox 70%/65% --- used fair (L) (GT) 1 5U4-GB $7.00 unknown 105%/100% --- used good (L) (GT) particles inside 1 5U4-GB $7.00 unknown 95%/95% --- used good (L) (GT) rattle inside 1 5U4-GB $7.00 unknown 105%/105% --- used good (L) (GT) melted plastic on tube 1 5U4-GB $7.00 unknown 110%/110% --- used (L) (GT) loose base - loose getter inside - borken locator pin 1 5U4-GB $7.00 unknown 100%/75% --- used fair (L) (GT) 1 5U4-GB $7.00 unknown 80%/80% --- used fair (L) (GT) 1 5U4-GB $6.00 unknown 70%/70% --- used fair (L) (GT) 1 5U4-GB $6.00 unknown 85%/75% --- used fair (L) (GT) shoulder base 1 5U4-GB $10.00 RCA 85%/70% --- used fair (L) (GT) 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%/70% --- used fair (L) (GT) 1 5U4-GB $6.00 RCA 60%/90% --- used fair (L) (GT) 1 5U4-GB $6.00 RCA 70%/60% --- used fair (L) (GT) 1 5U4-GB $10.00 RCA 80%/75% --- used fair (L) (GT) 1 5U4-GB $10.00 RCA 75%/75% --- used fair (L) (GT) shoulder base 1 5U4-GB $15.00 RCA 100%/95% --- used good (L) (GT) broken locator pin 1 5U4-GB $14.00 RCA 90%/90% --- used good (L) (GT) broken locator pin 1 5U4-GB $19.00 RCA 110%/110% --- used good (L) (GT) broken locator pin 1 5U4-GB $17.00 RCA 100%/100% --- used good (L) (GT) broken locator pin 1 5U4-GB $15.00 RCA 95%/95% --- used good (L) (GT) broken locator pin 1 5U4-GB $19.00 RCA 110%/110% --- used good (L) (GT) broken locator pin 1 5U4-GB $19.00 RCA 110%/110% --- used good (L) (GT) broken locator pin 1 5U4-GB $19.00 RCA 110%/110% --- used good (L) (GT) broken locator pin 1 5U4-GB $1.00 Sylvania 45%/50% --- used weak (L) (GT) 1 5U4-GB $1.00 Sylvania 40%/70% --- used weak (L) (GT) 1 5U4-GB $1.00 Sylvania 40%/40% --- used weak (L) (GT) 1 5U4-GB $1.00 IBM 45%/45% --- used weak (L) (GT) 1 5U4-GB $1.00 IBM 40%/40% --- used weak (L) (GT) 1 5U4-GB $1.00 IBM 40%/50% --- used weak (L) (GT) 1 5U4-GB $1.00 IBM 40%/40% --- used weak (L) (GT) 1 5U4-GB $1.00 IBM 40%/40% --- used weak (L) (GT) 1 5U4-GB $1.00 IBM 40%/40% --- used weak (L) (GT) 1 5U4-GB $1.00 IBM 40%/40% --- used weak (L) (GT) 1 5U4-GB $1.00 unknown 40%/110% --- used weak (L) (GT) 1 5U4-GB $1.00 unknown 55%/60% --- used weak (L) (GT) 1 5U4-GB $1.00 RCA 45%/60% --- used weak (L) (GT) 1 5U4-GB $1.00 RCA 40%/40% --- used weak (L) (GT) 1 5U4-GB $1.00 Silvertone 40%/40% --- used weak (L) (GT) 1 5U4-GB $0.50 Sylvania 30%/30% --- used weak (L) (GT) 1 5U4-GB $0.50 IBM 35%/30% --- used weak (L) (GT) 1 5U4-GB $0.50 Zenith 30%/40% --- used weak (L) (GT) broken locator pin 1 5U4-GB $0.50 unknown 50%/35% --- used weak (L) (GT) 1 5U4-GB $0.50 unknown 30%/50% --- used weak (L) (GT) 1 5U4-GB $0.25 IBM 30%/25% --- used weak (L) (GT) 1 5U4-GB $0.25 RCA 15%/80% --- used weak (L) (GT) 1 5U4-GB $0.25 RCA 35%/20% --- used weak (L) (GT) 1 5U4-GA $0.25 GE 20%/20% --- used weak (L) (GT) 1 5U4-GA/GB $0.25 GE 25%/35% --- used weak (L) (GT) 1 5U4-GB $0.25 Packard Bell 25%/30% --- used weak (L) (GT) 1 5U4-GB $0.25 Zenith 20%/20% --- used weak (L) (GT) 1 5U4-GB $0.25 IBM 30%/25% --- used weak (L) (GT) 1 5U4-GB $0.25 IBM 25%/25% --- used weak (L) (GT) 1 5U4-GB $0.25 ITT 75%/20% --- used weak (L) (GT) broken locator pin 1 5U4-GB $0.25 Tung-Sol 20%/20% --- used weak (L) (GT) 1 5U4-GB $0.10 Olympic 10%/10% --- used weak (L) (GT) 1 5U4-GA/GB $0.10 GE 20%/10% --- used weak (L) (GT) 1 5U4-GB $0.10 IBM 5%/5% --- used weak (L) (GT) 1 5U4-GB $0.10 IBM 5%/5% --- used weak (L) (GT) 1 5U4-GB $0.10 IBM 5%/5% --- used weak (L) (GT) 1 5U4-G $20.00 Raytheon 105%/105% --- used good (L) (ST) broken locator pin (cat:G2) 1 5U4-G $15.00 Raytheon 90%/90% --- used good (L) (ST) paint on tube (cat:G2) 1 5U4-G $2.50 Raytheon 90%/40% --- used weak (L) (ST) (cat:G2) 1 5U4-G/VT-244 $15.00 Raytheon 85%/85% --- used good (L) (ST) white particles inside (cat:G2) 1 5U4-G $15.00 Westinghouse 95%/95% --- used good (L) (ST) white particles inside (cat:G2) 1 5U4-G $10.00 Westinghouse 70%/70% --- used fair (L) (ST) (cat:G2) 1 5U4-G $20.00 Westinghouse 100%/100% --- used good (L) (ST) broken locator pin (cat:G2) 1 5U4-G $12.00 Westinghouse 80%/90% --- used good (L) (ST) broken locator pin (cat:G2) 1 5U4-G/VT-244 $12.00 Ken-Rad 80%/80% --- used good (L) (ST) broken locator pin (cat:G2) 1 5U4-G $7.00 Philco 60%/60% --- used fair (L) (ST) (cat:G2) 1 5U4-G $15.00 National Union 95%/100% --- used good (L) (ST) broken locator pin (cat:G2) 1 5U4-G $7.00 GE 65%/70% --- used fair (L) (ST) (cat:G2) 1 5U4-G $20.00 Sylvania 100%/100% --- used good (L) (ST) broken locator pin (cat:G2) 1 5U4-G $15.00 Sylvania 90%/90% --- used good (L) (ST) broken locator pin (cat:G2) 1 5U4-G $10.00 Sylvania 70%/80% --- used fair (L) (ST) (cat:G2) 1 5U4-G $10.00 Sylvania 80%/70% --- used fair (L) (ST) white particles inside (cat:G2) 1 5U4-G $20.00 Sylvania 100%/100% --- used good (L) (ST) loose glass inside (cat:G2) 1 5U4-G $20.00 Emerson 100%/100% --- used good (L) (ST) white particles inside (cat:G2) 1 5U4-G $12.00 Emerson 85%/80% --- used good (L) (ST) white particles inside (cat:G2) 1 5U4-G $12.00 Emerson 90%/80% --- used good (L) (ST) white particles inside (cat:G2) 1 5U4-G $12.00 Silvertone 85%/80% --- used good (L) (ST) white particles inside (cat:G2) 1 5U4-G $7.00 Silvertone 80%/60% --- used fair (L) (ST) broken locator pin (cat:G2) 1 5U4-G $10.00 Arvin 75%/70% --- used fair (L) (ST) (cat:G2) 1 5U4-G $7.00 Sheldon 80%/65% --- used fair (L) (ST) (cat:G2) 1 5U4-G $18.00 unknown 100%/100% --- used good (L) (ST) broken locator pin (cat:G2) 1 5U4-G $7.00 Cunningham 60%/60% --- used fair (L) (ST) (cat:G2) 1 5U4-G $15.00 Admiral 90%/90% --- used gassy (L) (ST) gassy (cat:G2) 1 5U4-G $20.00 RCA 90%/90% --- used good (L) (ST) loose glass inside (cat:G2) 1 5U4-G $12.00 RCA 70%/70% --- used fair (L) (ST) (cat:G2) 1 5U4-G $12.00 RCA 80%/75% --- used fair (L) (ST) (cat:G2) 1 5U4-G $12.00 RCA 75%/75% --- used fair (L) (ST) (cat:G2) 1 5U4-G $10.00 RCA 60%/60% --- used fair (L) (ST) (cat:G2) 1 5U4-G $10.00 RCA 65%/70% --- used fair (L) (ST) (cat:G2) 1 5U4-G $20.00 RCA 95%/95% --- used good (L) (ST) broken locator pin (cat:G2) 1 5U4-G $12.00 RCA 70%/90% --- used fair (L) (ST) (cat:G2) 1 25A6-G $12.00 Philco 110% 2800/2300Gm used leaky (50K ohm) (L) (ST) engraved base (cat:G2) 1 25A6-G $12.00 Wards Super Airline 30% 1500/2300Gm used (L) (ST) (cat:G2) 1 25A6-G $12.00 Philco 110% 2700/2300Gm used leaky (50K ohm) (L) (ST) engraved base - loose base (cat:G2) 1 25A6-G $12.00 Zenith 100% 2800/2300Gm used leaky (750K ohm) (L) (ST) engraved base (cat:G2) 1 25A7-G $0.50 National Union 85% Diode:5% 2000/1800Gm used (L) (ST) loose base - engraved base - clear glass (cat:G2) 1 25L6-G $12.00 Raytheon 100% 8000/8000Gm used leaky (2M ohm) (L) (ST) fat bulb - clear glass (cat:G2) 1 25L6-G $12.00 National Union 115% 10000/8000Gm used leaky (3M ohm) (L) (ST) fat bulb - clear glass (cat:G2) 1 25L6-G $12.00 Ken-Rad 80% 6000/8000Gm used leaky (300K ohm) (L) (ST) fat bulb - blak coat (cat:G2) 1 25L6-G $12.00 Hytron 120% 9500/8000Gm used leaky (2M ohm) (L) (ST) fat bulb - clear glass (cat:G2) 1 25L6-G $12.00 Zenith 120% 10000/8000Gm used leaky (50K ohm) (L) (ST) fat bulb - gray coat - engraved base (cat:G2) 1 25L6-G $12.00 GE 115% 11000/8000Gm used leaky (1M ohm) (L) (ST) fat bulb - gray coat (cat:G2) 1 25L6-G $12.00 RCA 120% 10500/8000Gm used leaky (500K ohm) (L) (ST) fat bulb - gray coat (cat:G2) 1 25L6-G $12.00 National Union 110% 11000/8000Gm used leaky (750K ohm) (L) (ST) fat bulb - gray coat (cat:G2) 1 25L6-G $12.00 Zenith 120% 12000/8000Gm used (L) (ST) fat bulb - gray coat - intermittent grid short (cat:G2) 1 25L6-G $12.00 Tung-Sol 135% 12500/8000Gm used leaky (50K ohm) (L) (ST) skinny bulb - black coat (cat:G2) 1 25L6-G $12.00 Champion 110% 10500/8000Gm used leaky (1M ohm) (L) (ST) skinny bulb - gray coat (cat:G2) 1 25L6-G $12.00 Champion 110% 11500/8000Gm used leaky (3M ohm) (L) (ST) skinny bulb - black coat (cat:G2) 1 25L6-G $12.00 Champion 120% 11500/8000Gm used leaky (2M ohm) (L) (ST) skinny bulb - gray coat (cat:G2) 1 25L6-G $12.00 GE 130% 8000/8000Gm used leaky (250K ohm) (L) (ST) skinny bulb - gray coat (cat:G2) 1 35Z5-GT/G $12.00 Raythoen 100% --- used leaky (3M ohm) (L) (TT) tall tubular bulb (cat:G2) 1 35Z5-G $12.00 Zenith 100% --- used leaky (2M ohm) (L) (ST) (cat:G2) 1 35Z5-G $12.00 National Union 75% --- used fair (L) (ST) (cat:G2) 1 50Z7-G $0.50 Zenith --- --- used heater 1/2 open (L) (ST) (cat:G2) 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). 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. Contact MDB Ventures sales@mdbventures.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. Go back to the TOP Bargain Bin Tubes Shipping and Handling Information MDB Ventures Home Don't forget to visit our Discount Bargain Packs for more savings! Email: MDB Ventures sales@mdbventures.com