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 1A7-G $2.50 RCA Victor 85% / 65% 1100: 300 / 900: 275Gm Used fair (L) (TT) (cat:312:324 - C2)
1 1A7-G $0.50 RCA 5% / 5% 50: 0 / 900: 275Gm Used weak (L) (TT) (cat:C2)
1 1A7-G $0.50 Philco 40% / 20% 600: 50 / 900: 275Gm Used weak (L) (TT) (cat:C2)
1 1A7-G $2.50 Sylvania 70% / 120% 1200: 400 / 900: 275Gm Used fair (L) (TT) (cat:C2)
1 1D5-G $1.50 Wards Super Airline 40% 250 / 750Gm Used Weak (ST) (cat:C2)
1 1D5-GP $3.00 Hytron 60% 400 / 750Gm used fair (ST) (cat:C2)
1 1D5-GP $3.00 Sylvania 100% 700 / 750Gm used good (ST) broken locator pin (cat:C2)
1 1D5-GP $3.00 Wards Super Airline 50% 350 / 750Gm used weak (ST) (cat:C2)
1 1E4-G $7.50 Marconi 70% 1400 / 1400Gm Used fair (L) (TT) (cat:312:298 : C2)
1 1E5-G $2.50 National Union 70% 700 / 640Gm Used fair (L) (TT) engraved base (cat: C2)
1 1E7-G $2.50 Philco 100% / 60% 1050: 650 / 1150Gm Used fair (L) (TT) engraved base (cat:C2)
1 1E7-G $2.50 Super Silvertone 70% / 70% 600: 700 / 1150Gm Used fair (L) (TT) engraved base (cat:C2)
1 1F7-GV $1.00 Super Silvertone 110% diodes: 50% / 60% 700 / 650Gm used (L) (ST) (cat:C2)
1 1F7-GV $1.00 National Union 110% diodes: 20% / 20% 900 / 650Gm used (L) (ST) (cat:C2)
1 1F7-G $1.00 Hytron 130% diodes: 90% / 50% 550 / 650Gm used (L) (ST) (cat:C2)
1 1G5-G $0.50 Super Silvertone 5% 50 / 1500Gm Used weak (L) (ST) (cat:C2)
1 1G5-G $0.50 RCA 5% 50 / 1500Gm Used weak (L) (ST) (cat:C2)
1 1G5-G $0.50 Wards Super Airline 5% 50 / 1500Gm Used weak (L) (ST) (cat:C2)
1 1G5-G $0.50 Wards Super Airline 25% 150 / 1500Gm Used weak (L) (ST) (cat:C2)
1 1H4-G $2.50 Philco 65% 600 / 900Gm Used fair (L) (ST) engraved base (cat:C2)
1 1H4-G $1.00 Philco 50% 400 / 900Gm Used weak (L) (ST) engraved base (cat:C2)
1 1H4-G $0.50 Super Silvertone 20% 200 / 900Gm Used weak (L) (ST) engraved base (cat:C2)
1 1H4-G $3.00 Super Silvertone 70% 700 / 900Gm Used fair (L) (ST) (pl) (cat:C2)
1 1H4-G $4.00 Sylvania 75% 600 / 900Gm Used fair (L) (ST) (cat:C2)
1 1N5-G $2.50 Westinghouse 60% 450 / 750Gm Used fair (L) (TT) (cat:312:298 : C2)
1 1N5-G $2.50 GE 60% 350 / 750Gm Used fair (L) (TT) (cat:312:303 : C2)
1 1N5-G $2.50 Sparton 75% 600 / 750Gm Used fair (L) (TT) (cat:C2)
1 1N5-G $2.50 Raytheon 70% 600 / 750Gm Used fair (L) (TT) (cat:C2)
1 1P5-G $4.00 Westinghouse 65% 350 / 575Gm used fair (L) (TT) (cat:C2)
1 5V4-G $4.00 National Union 50% / 90% --- used weak (ST) (cat:BC2)
1 5V4-G $6.00 Sylvania 90% / 75% --- used fair (ST) (cat:BC2)
1 5V4-G $5.00 Sylvania 70% / 60% --- used fair (ST) (cat:BC2)
1 5V4-G $6.00 Ken-Rad 75% / 90% --- used fair (ST) (cat:BC2)
1 5W4-G $2.00 Super Silvertone 70% / 70% --- used fair (ST) (cat:BC2)
1 5W4-G $1.50 Firestone Air Chief by Ken-Rad 65% / 55% --- used weak (ST) (cat:BC2)
1 5Y3-G $6.00 National Union 75% / 75% --- used fair (ST) (cat:BC2)
1 5Y3-G $6.00 Ken-Rad 55% / 75% --- used weak (ST) engraved base (cat:C2)
1 5Y3-G $1.00 Super Silvertone 35% / 25% --- used weak (ST) (cat:BC2)
1 5Y3-G $7.50 Tung-Sol 70% / 80% --- used fair (ST) (cat:BC2)
1 5Y3-G $1.00 RCA Victor 90% / 40% --- used weak (ST) (cat:BC2)
1 6A8-G $3.00 Ken-Rad 100% / 105% 1650: 450 / 1000: 300Gm Used leaky (3M) (L) (ST) (cat:C2)
1 6A8-G $5.00 Ken-Rad 120% / 80% 1200: 350 / 1000: 300Gm Used fair (L) (ST) engraved base (cat:C2)
1 6AC5-G $2.00 Sylvania 120% 850 / 1000Gm Used leaky (2M) (L) (ST) gray coat (cat:C2)
1 6AC5-G $5.00 Sparton 75% 700 / 1000Gm Used fair (L) (ST) clear glass (cat:C2)
1 6AC5-G $5.00 Sparton 70% 700 / 1000Gm Used fair (L) (ST) clear glass (cat:C2)
1 6AC5-G $1.00 Super Sivertone 30% 500 / 1000Gm Used weak (L) (ST) gray coat (cat:C2)
1 6AC5-G $1.00 Ken-Rad 80% 1600 / 1000Gm Used leaky (100K) (L) (ST) (cat:C2)
1 6AC5-G $2.00 RCA 95% 1000 / 1000Gm Used leaky (5M) (L) (ST) gray coat (cat:C2)
1 6AC5-G $0.50 Zenith 10% 100 / 1000Gm Used weak (L) (ST) gray coat (cat:C2)
1 6AC5-G $0.50 Zenith 10% 250 / 1000Gm Used weak (L) (ST) gray coat (cat:C2)
1 6AC5-GT $0.50 RCA 120% 1250 / 1000Gm Used (L) (ST) smooth black plate - red lettering - clear glass - heater cathode short (cat:C2)
1 6AC5-GT $2.50 Cunningham 70% 750 / 1000Gm Used fair (L) (ST) black coat (cat:C2)
1 6AD7-G $2.00 Sylvania 110% / 60% 2400: 400 / 2000: 380Gm Used Fair (ST) gray coat (cat:C2)
1 6AD7-G $2.00 Raytheon 120% / 60% 2600: 300 / 2000: 380Gm Used Fair (ST) gray coat (cat:C2)
1 6AD7-G $0.50 RCA 115% / 15% 2400: 100 / 2000: 380Gm Used Weak (ST) gray coat (cat:C2)
1 6AE5-G $4.00 National Union 50% 500 / 1200Gm Used Weak (ST) --- (cat:C2)
1 6AE6-G $1.00 Ken-Rad 30% / 60% 300: 600 / 750: 850Gm Used Weak (ST) --- (cat:C2)
1 6AE6-G $3.00 Ken-Rad 80% / 100% 700: 950 / 750: 850Gm Used Fair (ST) --- (cat:C2)
1 6AF5-G $4.00 Sylvania 75% 1050 / 1500Gm Used fair (ST) --- (cat:C2)
1 6AF5-G $4.00 Super Silvertone 70% 1200 / 1500Gm Used fair (ST) --- (cat:C2)
1 6B4-G $7.50 Philco 30% 1800 / 3000Gm Used weak (L) (ST) (cat:C2)
1 6B6-G $1.00 Zenith 60% diodes: 130% / 130% 300 / 750Gm Used weak (OB) (ST) engraved base (cat:C2)
1 6B6-G $2.50 Super Silvertone 80% diodes: 120% / 120% 400 / 750Gm Used fair (OB) (ST) (cat:C2)
1 6C5-G $2.50 Cunningham 140% 2200 / 2000Gm Used Leaky (2M) (ST) (cat:C2)
1 6C5-G $2.50 Super Silvertone 65% 1100 / 2000Gm Used Fair (ST) engraved base (cat:C2)
1 6CW5 $0.50 Motorola 110% 9000 / 7500Gm Used Leaky (1M) (M9)
1 6D8-G $3.00 National Union 70% / 150% 800: 500 / 1000: 240Gm Used Fair (ST) (cat:C2)
1 6D8-G $3.00 Wards Super Airline 95% / 110% 130: 350 / 1000: 240Gm Used Leaky (5M) (ST) (cat:C2)
1 6D8-G $3.00 Sylvania 75% / 150% 850: 500 / 1000: 240Gm Used Fair (ST) black coat (cat:C2)
1 6D8-G $3.00 Firestone Air Chief 70% / 90% 1300: 300 / 1000: 240Gm Used Fair (ST) black coat (cat:C2)
1 6EZ8 $0.50 GE 90% / 80% / 70% 60 / 60 / 60dmc used (rb) (M9) white lettering
1 6F5-G $5.00 Crosley by Ken-Rad 100% --- used Leaky (100K) (ST) --- (cat:C2)
1 6F5-G $7.50 Zenith 75% 700 / 1000Gm Used Fair (ST) engraved base (cat:C2)
1 6F5-G $5.00 Zenith 120% 1300 / 1000Gm Used Leaky (2M) (ST) (cat:C2)
1 6F5-G $10.00 RCA 80% 800 / 1000Gm Used Fair (ST) broken locator pin (cat:C2)
1 6F5-G $8.00 GE 120% 1250 / 1000Gm Used Leaky (200K) (ST) (cat:C2)
1 6F5-G $5.00 Tung-Sol 120% 1200 / 1000Gm Used Leaky (5M) (ST) engraved base (cat:C2)
1 6F5-G $5.00 Westinghouse 140% 1450 / 1000GmUsed Leaky (100K) (ST) (cat:C2)
1 6F6-G $5.00 Philco 60% 1500 / 2000Gm Used Leaky (2M) (ST) engraved base (cat:C2)
1 6F6-G $8.00 Philco 85% 1850 / 2000Gm Used Leaky (150K) (ST) engraved base - ribbed black plate (cat:C2)
1 6F6-G $5.00 Raytheon 60% 1500 / 2000Gm Used Fair (ST) (cat:C2)
1 6F6-G $5.00 Firestone Air Chief 70% 1700 / 2000Gm Used Fair (ST) (cat:C2)
1 6F6-GT $3.00 RCA 120% 2450 / 2000Gm Used Leaky (2M) (GT) (cat:C2)
1 6F6-GT $2.50 National Union 55% 1400 / 2000Gm Used Weak (GT) (cat:C2)
1 6F6-GT $2.00 Coronado 45% 800 / 2000Gm Used Weak (GT) (cat:C2)
1 6F6 $2.00 Sylvania 100% 2100 / 2000Gm Used Leaky (500K) Metal tube (cat:C2)
1 6F6 $2.50 RCA 80% 1800 / 2000Gm Used Fair Metal tube - minor rust on tube (cat:C2)
1 6F6 $2.50 RCA 125% 2500 / 2000Gm unused Metal tube - minor rust on tube (cat:C2)
1 6G6-G $1.00 National Union 120% 2600: 2100Gm used leaky (2M) (L) (ST) clear glass (cat:1g)
1 6G6-G $1.00 Hytron 70% 2200: 2100Gm used (L) (ST) clear glass (cat:1g)
1 6G6-G $1.00 Ken-Rad 75% 2200: 2100Gm used (L) (ST) black coat (cat:1g)
1 6G6-G $1.50 Tung-Sol 85% 2000: 2100Gm used (L) (ST) clear glass (cat:1g)
1 6G6-G $0.50 Raytheon 110% 2750: 2100Gm used (L) (ST) black coat - intermitent (cat:1g)
1 6G6-G $1.50 RCA 85% 2200: 2100Gm used (L) (ST) clear glass - (cat:401-421 - 1g)
1 6G6-G / VT-198A $1.00 RCA 65% 1750: 2100Gm used (L) (ST) clear glass - JAN (cat:1g)
1 6N6-G $7.50 Philco 50% 1100 / 1300Gm Used Weak (ST) (cat:C2)
1 6N6-G $7.50 Sylvania 100% 700 / 1300Gm Used Fair (ST) (cat:C2)
1 6N6-G $10.00 Sylvania 60% 1200 / 1300Gm Used Fair (ST) (cat:C2)
1 6N6-G $5.00 Sylvania 40% 1500 / 1300Gm Used Weak (ST) engraved base (cat:C2)
1 6N6-G $12.50 Sylvania 130% 1800 / 1300Gm Used Good (ST) broken locator pin (cat:C2)
1 6N6-G $10.00 Super Silvertone 60% 1100 / 1300Gm Used Fair (ST) engraved base - gray coat (cat:C2)
1 6N6-G $12.50 National Union 100% 1600 / 1300Gm Used Fair (ST) broken locator pin (cat:C2)
1 6N7-G $5.00 Sylvania 70% / 70% 850: 850 / 1500Gm Used Fair (ST) engraved base (cat:C2)
1 6N7-G $3.00 Zenith 150% / 140% 2250: 2000 / 1500Gm Used Leaky (3M) (ST) engraved base (cat:C2)
1 6N7-G $2.00 Zenith 100% / 45% 1600: 10 / 1500Gm Used Leaky (300K) (ST) engraved base (cat:C2)
1 6N7-G $2.00 GM 90% / 80% 1750: 1550 / 1500Gm Used Fair (ST) engraved base (cat:C2)
1 6N7-G $4.00 unknown 70% --- Used Fair (ST) cat:401-102 (cat:C2)
1 6N7-GT $2.50Tung-Sol 130% / 120% 1650: 1750 / 1500Gm Used Leaky (5M) (GT) broken locator pin (cat:C2)
1 6N7 $2.00 GE 70% / 70% 700: 700 / 1500Gm Used Fair Metal tube (cat:C2)
1 6N7 $1.50 RCA 60% / 45% 600: 500 / 1500Gm Used Weak Metal tube (cat:C2)
1 6N7 $2.50 Raytheon 90% / 75% 950: 800 / 1500Gm Used Fair Metal tube (cat:C2)
1 6N7 $2.50 Sylvania 110% / 120% 1500: 1500 / 1500Gm Used leaky (50K) Metal tube (cat:C2)
1 6N7 $2.50 US Navy 75% / 80% 900: 1000 / 1500Gm Used Fair Metal tube (cat:C2)
1 6N7-GT $2.50 RCA 40% / 60% 450: 650 / 1500Gm Used weak (GT) gray coat (cat:C2)
1 6N7-GT $2.50 RCA 90% / 80% 1200: 1450 / 1500Gm Used Fair (GT) JAN - gray coat (cat:C2)
1 6N7-GT $2.50 RCA 120% / 120% 1600: 1600 / 1500Gm Used leaky (3M) (GT) JAN - gray coat (cat:C2)
1 6N7-GT $2.50 RCA 70% / 70% 800: 900 / 1500Gm Used Fair (GT) gray coat (cat:C2)
1 6SC7GTY $2.00 Westinghouse 70% / 90% 600: 800 / 1000Gm Used Fair (GTY) brown base - pin 1 ground stap - black coat
1 6SL7GT $0.50 RCA 30% / 20% 200: 350 / 1250Gm Used Weak (GT) round black plates - gray coat
1 6SL7GT $0.50 RCA 40% / 40% 600: 500 / 1250Gm Used Weak (GT) gray coat
1 6X5WGT $1.00 Raytheon 110% / 110% --- Used leaky (5M) JAN - brown base
1 6SU7GTY $0.25 Tung-Sol 0% / 105% --- Used Bad (GTY) brown base
1 6Y6-G $1.00 CBS / Hytron 70% 4800 / 5000Gm Used fair (ST) (cat:C2)
1 6Y6-G $1.00 CBS / Hytron 80% 4600 / 5000Gm Used fair (ST) (cat:C2)
1 6Y6-G $0.50 RCA 80% 2600 / 5000Gm Used weak (ST) (cat:C2)
1 12A8-G $0.50 Sylvnaia 30% / 60% 350: 200 / 1000: 300Gm Used weak (L) (ST) (cat:C2)
1 12A8-G $1.00 Sylvania 50% / 90% 650: 250 / 1000: 300Gm Used weak (L) (ST) (cat:C2)
1 12A8-G $1.50 Zenith 120% / 70% 1650: 500 / 1000: 300Gm Used fair (L) (ST) (cat:C2) broken locator pin
1 12AZ7A $2.50 Packard Bell 130% / 140% 4400: 5000 / 4000Gm used leaky (5M) (L) (M9) tall bottle
1 12BZ7 $0.10 CBS / Columbia 60% / 30% 550: 200 / 1000Gm used weak (L) (M9) rectangular ribbed black plates
1 12SL7GT $2.00 RCA 90% / 80% 1200: 1150 / 1250Gm used (L) cat:403-327-3
1 12SL7GT $2.00 RCA 80% / 90% 1300: 1500 / 1250Gm used (L) cat:403-327-2
1 12SL7GT $1.50 RCA 70% / 90% 1300: 1150 / 1250Gm used (L) cat:403-327-6 loose base
1 12SL7GT $1.50 Western Union 90% / 70% 700: 700 / 1250Gm used (L) Chrome top - top getter - round black plates
1 12SL7GT / VT-289 $2.50 Sylvania 110% / 110% 1200: 1200 / 250Gm used (L) bottom getter - round black plates - cracked base - JAN
1 12SL7GT $0.50 GE 40% / 65% 500: 900 / 1250Gm used weak (L) side getter - round silver plates
1 12SL7GT $2.00 RCA 110% / 110% 1350: 1350 / 1250Gm used Leaky (L) gray coat
1 12SN7GT $2.50 GE 85% / 85% --- Used (L) (GT) bottom getter - rectangular black plates
1 12SN7GT $2.50 GE 90% / 80% 2100 / 1900Gm Used (L) (GT) side getter - rectangular gray plates
1 12SN7GT $2.00 Raytheon 90% / 70% 1600: 1450 / 2000Gm Used (L) (GT) bottom getter - rectangular black plates - grid 'c' clips
1 12SN7GT $2.50 Sylvania 80% / 100% 2150: 2350 / 2000Gm Used (L) (GT) top getter - square black plates - yellow lettering
1 307-A / VT-225 $10.00 Sylvania 110% 2400 / 2000Gm Used leaky (500K) (ST) (H) dual getter - ribbed black plate
1 802 $1.00 RCA 60% 2300 / 2100Gm Used Leaky (ST) engraved base (cat:402-163)
1 802 $1.00 RCA 60% 1350 / 2100Gm Used Leaky (300K) (ST) engraved base
1 802 $1.50 RCA 100% 2100 / 2100Gm Used Leaky (2M) (ST) engraved base
1 802 $1.00 RCA / Deforest 2% 350 / 2100Gm Used weak (ST) engraved base
1 807 $5.00 RCA 100% 3400 / 3800Gm Used fair (ST) mica supports
1 837 $2.50 Westinghouse 130% 3000 / 4000Gm Used fair (ST) bayonet pin - brwon base
1 837 $2.50 US Navy 110% 500 / 4000Gm Used weak (ST) bayonet pin - brown base
1 1626 / VT-137 $1.00 RCA 110% 2300 / 2100Gm used leaky (5M)(L) US Army - brown base - grid clip (cat:401-561) (cat:C2)
1 1626 / VT-137 $1.00 RCA 110% 2250 / 2100Gm Used Leaky (2M) (ST) brown base - grid clip (cat:C2)
1 1626 / VT-137 $1.00 RCA 120% 2350 / 2100Gm Used Leaky (750K) (ST) brown base - grid clip (cat:C2)
1 6888 $0.50 Sylvania 50% --- Used weak USAF - metal base
1 6888 $0.25 Sylvania 25% --- Used weak USAF - metal base
1 6888 $0.40 Sylvania 40% --- Used leaky (5M) USAF - metal base
1 7199 $1.00 Lafayette 100% / 60% 70 / 40dmc Used Leaky (2M) (M9)
1 7355 $0.50 Harmon Kardon30% 2300 / 5000Gm Used Weak (GT)
1 7355 $0.50 Bogen 20% 1100 / 5000Gm Used Weak (GT)
1 7355 $1.00 Bogen 50% 3300 / 5000Gm Used Weak (GT)
1 7591 $5.00 GE 90% --- Used Leaky (GT)
1 7591 $5.00 GE 70% --- used fair (L) ---
1 7591 $5.00 Sylvania 85% --- used good (L) ---
1 7591 $0.50 RCA 120% --- used (L) heater cathode short - brown base

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