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 19 $2.00 Ken-Rad untested heater ok used (L) (ST) solder blobs on pins (cat:BL2)
1 19 $2.00 Zenith 35% / 35% 600:700 / 1000Gm used weak (L) (ST) engraved base (cat:BL2)
1 19 $1.00 Wards 5% / 45% 50:650 / 1000Gm used weak (L) (ST) (cat:BL2)
1 NU-24A $2.50 Nationl Union 120% 1250 / 1000Gm used (L) (ST) cracked base - engraved base (cat:312-16 : BL1)
1 NU-24A $2.50 National Union 120% 1250 / 1000Gm used (L) (ST) particles inside - engraved base (cat:BL1)
1 24A $2.50 Tung-Sol 120% 1100 / 1000Gm used (L) (ST) white particles inside - engraved base - perf plate (cat:BL1)
1 24A $2.50 RCA / Cunningham 120% 1200 / 1000Gm used (L) (ST) loose cap - engraved base (cat:32-131 : BL1)
1 27 $5.00 Philco 100% 1050 / 1000Gm used good (ST) engraved base - loose base - rattle in base
1 27 $5.00 National Union 110% 1200 / 1000Gm used good (ST) engraved base - loose base - rattle in base
1 27 $4.00 National Union 75% 750 / 1000Gm used fair (L) (ST)
1 27 $3.00 Ceco 70% 600 / 1000Gm used fair (L) (ST)
1 27 $7.50 Sylvania 90% 850 / 1000Gm used good (L) (ST)
1 27 $5.50 National Union 80% 850 / 1000Gm used fair (L) (ST) engraved base (pl) (cat:BL2)
1 27 $4.00 Tung-Sol 75% 950 / 1000Gm used good (L) (ST) engraved base (cat:BL2)
1 27 $4.00 RCA 75% 850 / 1000Gm used fair (L) (ST) (cat:BL2)
1 27 $5.00 RCA / Cunningham 80% 800 / 1000Gm used fair (L) (ST) engraved base cat:312-99 : BL2)
1 30 $5.00 Philco 120% 1150 / 900Gm used fair (L) (ST) engraved base - rattle in base
1 30 $2.00 Ken-Rad 65% 700 / 900Gm used fair (L) (ST) engraved base
1 32 $1.00 Wards Super Airline 20% 100 / 640Gm used weak (L) (ST) engraved base
1 32 $2.00 Tung-Sol 80% 600 / 640Gm used weak (L) (ST) engraved base
1 33 $1.50 Wards 60% 800 / 1450Gm used fair (L) (ST)
1 34 $4.50 Wards Airline 70% 350 / 600Gm used fair (L) (ST) engraved base
1 34 $4.00 Wards Airline 60% 300 / 600Gm used fair (L) (ST) engraved base
1 34 $5.00 RCA / Cunningham 70% 650 / 600Gm used fair (L) (ST) engraved base - loose base
1 35 / 51 $3.00 Philco 95% --- used (L) (ST) ---
1 35 / 51 $2.00 Super Silvertone 80% 1050 / 1020Gm used fair (L) (ST) engraved base
1 35 / 51 $1.50 Super Silvertone 80% 750 / 1020Gm used fair (L) (ST)
1 36 $0.50 RCA Victor 70% 700 / 1450Gm used weak (L) (ST) (cat:BL2)
1 41 $6.00 Sylvania / Crosley 105% 1950 / 1600Gm Used Good (L) (ST) engraved base - loose base - rattle in base
1 41 $6.00 Troy 110%1900 / 1600Gm Used Good (L) (ST) engraved base - loose base - rattle in base
1 41 $2.50 Philco 120%2000 / 1600Gm Used Fair (L) (ST) engraved base - small crack in glass
1 41 $4.00 Sylvania 70% 1500 / 1600Gm Used Fair (L) (ST)
1 41 $3.50 RCA 65% 1450 / 1600Gm Used Fair (L) (ST)
1 41 $3.50 Tung-Sol 70% 1300 / 1600Gm Used Fair (L) (ST)
1 41 $3.50 RCA 70% 1450 / 1600Gm Used Fair (L) (ST)
1 41 $3.50 GE 70% 1400 / 1600Gm Used Fair (L) (ST)
1 41 $3.50 RCA 70% 1500 / 1600Gm Used Fair (L) (ST)
1 41 $3.50 Sylvania 65% 1400 / 1600Gm Used Fair (L) (ST)
1 41 $3.00 Philco 65% 1050 / 1600Gm Used Fair (L) (ST) loose base
1 41 $4.25 Raytheon 70% 1850 / 1600Gm Used Fair (L) (ST)
1 41 $3.50 National Union70% 1400 / 1600Gm Used Fair (L) (ST)
1 41 $3.75 National Union65% 1800 / 1600Gm Used Fair (L) (ST) engraved base
1 41 $3.00 Tung-Sol 60% 1050 / 1600Gm Used Fair (L) (ST)
1 41 $3.75 Philco 65% 1400 / 1600Gm Used Fair (L) (ST)
1 41 $3.25 GE 70% 1200 / 1600Gm Used Fair (L) (ST)
1 41 $3.75 National Union65% 1450 / 1600Gm Used Fair (L) (ST) engraved base
1 41 $3.25 GE 65% 1250 / 1600Gm Used Fair (L) (ST)
1 55 $2.00 Ken-Rad 100% diodes:110% / 90% 1050 / 975Gm used leaky (4M) engaved base (cat:LB2)
1 55 $0.50 Sylvania 30% diodes:120% / 110% --- used weak (cat:312-178 : LB2)
1 55 $2.00 Super Silvertone 120% diodes:100% / 50% 1400 / 975Gm used fair (cat:LB2)
1 55 $1.00 Sylvania 80% diodes:120% / 100% --- used fair (cat:LB2) engraved base
1 57 $0.50 Super Silvertone 90% 800 / 1225Gm used (L) (ST) (cat:BL1) used leaky 500K (cat:low:BL2)
1 58 $0.50 RCA / Cunningham 60% 900 / 1600Gm used fair (L) (ST) engraved base (cat:BL2)
1 58 $0.50 RCA 70% 1100 / 1600Gm used fair (L) (ST) engraved base (cat:BL2)
1 71A $9.00 National Union --- --- Used bad (ST) grid to heater short
1 75 $2.50 RCA 110% --- Used (ST) Cap Missing (MC)
1 280 $7.50 Silvertone 75% / 75% --- used good (ST) engraved base (cat:BL2)
1 80 $5.00 National Union 75% / 80% --- used good (ST) engraved base - ribbed plate (cat:BL2)
1 80 $2.00 Sylvania 110% / 110% --- used good (ST) pin tips were cut off and resoldered (cat:BL2)
1 83V $1.00 Westinghouse 110% / 110% --- used - broken pin (ST) (cat:BL2)
1 84 / 6Z4 $1.50 Philco 80% / 110% ---Used Fair (ST) engraved base
1 84 / 6Z4 $1.50 Sylvania 100% / 100% --- Used (ST) engraved base - loose base
1 84 / 6Z4 $1.25 Philco 70% / 75% --- Used Fair (ST) engraved base
1 84 / 6Z4 $1.25 Philco 75% / 85% --- Used Fair (ST)
1 1A4T $0.50 Coronado 10% --- used weak (ST) (cat:401-130 : LB2)
1 1A4 $0.50 Coronado 5% 10 / 750 used weak (ST) (cat:401-130 : LB2) engraved base
1 1B5 / 25S $4.00 Super Silvertone 120% diodes:50% / 40% 800 / 575Gm Used fair (ST) engraved base (cat:BL2)
1 2A5 $2.50 Super Airline 110% 2100 / 1640Gm Used leaky (800K) (ST) engraved base (cat:BL2)
1 2A5 $2.50 RCA 100% 2200 / 1640Gm Used leaky (300K) (ST) (cat:BL2)
1 2A5 $2.50 Cunningham 120% 3000 / 1640Gm Used leaky (1M) (ST) (cat:BL2) gray coat - grid 'c' clip
1 2A5 $2.50 National Union 110% 2250 / 1640Gm Used leaky (200K) (H) (ST) grid 'c' clip (cat:BL2)
1 2A7 $2.50 Triad 75% 1100:450 / 1000:300Gm used fair (L) (ST) (cat:LB2)
1 2A7 $2.00 RCA / Cunningham 60% 1000:400 / 1000:300Gm used fair (L) (ST) engraved base (cat:LB2)
1 2A7 $2.50 Sylvania 70% 1200:300 / 1000:300Gm used fair (L) (ST) engraved base (cat:LB2)
1 2A7 $1.00 Coronado 50% 750:300 / 1000:300Gm used weak (L) (ST) loose base (cat:LB2)
1 2A7 $2.00 National Union 65% 1000:250 / 1000:300Gm used fair (L) (ST) loose base - engraved base (cat:LB2)
1 2A7 $0.50 Wizard 90% 1150:350 / 1000:300Gm used (L) (ST) intermitent - loose base - engraved base (cat:LB2)
1 2A7 $1.00 Silvania 50% 1050:200 / 1000:300Gm used weak (L) (ST) engarved base (cat:LB2)
1 2A7 $0.25 Majestic 5% 50:10 / 1000:300Gm used weak (L) (ST) engraved base - paint shield (cat:LB2)
1 2A7 $2.50 RCA 70% 1100:400 / 1000:300Gm used fair (L) (ST) engraved base (cat:LB2)
1 2A7 $1.00 Raytheon 50% 600:200 / 1000:300Gm used weak (L) (ST) paint on tube (cat:LB2)
1 2A7 $2.00 Zenith 80% 1000:30 / 1000:300Gm used fair (L) (ST) loose cap - loose base - engraved base - rattle in base (cat:LB2)
1 2A7 $0.50 RCA 40% 750:350 / 1000:300Gm used weak (L) (ST) engraved base (cat:LB2)
1 2A7 $1.00 RCA 50% 750:250 / 1000:300Gm used weak (L) (ST) (cat:LB2)
1 5Z3 / VT-145 $2.00 Ken-Rad 60% / 60% --- Used Fair Rectifier (ST) (CAT:BL2)
1 5Z3 $2.50 Tung-Sol 75% / 90% --- Used Fair Rectifier (ST) (CAT:BL2)
1 5Z3 $2.00 RCA 70% / 65% --- Used Fair Rectifier (ST) (CAT:BL2) US Navy
1 5Z3 $2.00 RCA Victor 60% / 60% --- Used Fair Rectifier (ST) (CAT:BL2)
1 5Z3 $2.00 RCA 60% / 60% --- Used Fair Rectifier (ST) (CAT:BL2)
1 5Z3 $2.00 RCA 80% / 70% --- Used Fair Rectifier (ST) US Navy (CAT:BL2)
1 5Z3 $2.00 RCA 80% / 80% --- Used Fair Rectifier (ST) reglued base (CAT:BL2)
1 5Z3 $2.00 Sylvania 75% / 75% --- Used Fair Rectifier (ST) white particles inside (CAT:BL2)
1 5Z3 $2.00 National Union80% / 80% --- Used Fair Rectifier (ST) engraved base (CAT:BL2)
1 6A6 $0.50 RCA 20% / 120% 0:1600 / 1500Gm Used Weak (ST) (cat:BL2)
1 6A7 $0.50 unknown 25% --- Used Weak (ST) cat:402-38
1 6A7 $0.50 National Union90% / 140% 1300:500 / 1000:300Gm Used leaky (ST) loose base - engraved base (cat:BL2)
1 6A7 $0.50 RCA 120% / 50% 1100:400 / 1000:300Gm Used weak (ST) (cat:BL2)
1 6A7 $0.50 RCA / Cunningham55% / 140% 1150:450 / 1000:300Gm Used Weak (ST) (cat:BL2) - loose base - loose cap - engraved base
1 6A7 $0.50 Tung-Sol 80% / 90% 1000:300 / 1000:300Gm Used fair (ST) (cat:BL2)
1 6A7 $0.50 Philco 100% / 70% 1000:300 / 1000:300Gm Used fair (ST) (cat:BL2) engraved base
1 6A7 $0.50 RCA 90% / 70% 1150:400 / 1000:300Gm Used fair (ST) (cat:BL2)
1 6B7 $0.50 RCA / Cunningham 100% diodes:110% / 110% 250 / 1000Gm used weak (L) (ST) engraved base (cat:LB2)
1 6B7 $0.50 Wards Super Airline 110% diodes:90% / 110% 250 / 1000Gm used weak (L) (ST) engraved base (cat:LB2)
1 6C6 $2.00 RCA 110% --- used Good (ST) loose cap (cat:401-119 : LB2)
1 6D6 $2.00 RCA 120% 2000 / 1600Gm used leaky 2M (ST) ---
1 6D6 $2.00 RCA 110% 1900 / 1600Gm used good (ST) loose cap
1 6E7 $2.00 unknown 120% 600 / 1000Gm used weak (ST) no shield
1 6F7 $1.00 RCA / Cunningham 50% / 90% 650:400 / 700:315Gm used leaky (1M) (L) (ST) (cat:LB2) engraved base (H)
1 6F7 $2.00 RCA / Cunningham 80% / 100% 900:400 / 700:315Gm used fair (L) (ST) (cat:LB2) engraved base (H) - loose cap
1 6F7 $1.00 RCA Victor 90% / 100% 1050:400 / 700:315Gm used leaky (50K) (L) (ST) (cat:LB2) engraved base (H)
1 6F7 $0.50 Sylvania 40% / 30% 700:200 / 700:315Gm used weak (L) (ST) (cat:LB2) engraved base (H)
1 6F7 $2.00 Sylvania 80% / 100% 1000:450 / 700:315Gm used fair (L) (ST) (cat:LB2) (H)
1 6F7 $1.00 Sylvania 80% / 140% 750:150 / 700:315Gm used weak (L) (ST) (cat:LB2) (H)
1 6F7 $1.00 Sylvania 140% / 70% 800:500 / 700:315Gm used weak (L) (ST) (cat:LB2) gray coat (H)
1 6F7 $1.00 Wards Super Airline 70% / 80% 1050:300 / 700:315Gm used leaky (2M) (L) (ST) (cat:LB2) engraved base (H)
1 6F7 $0.50 National Union 90% / 20% 950:50 / 700:315Gm used weak (L) (ST) (cat:LB2) engraved base (H)
1 6F7 $1.00 National Union 70% / 120% 800:500 / 700:315Gm used fair (L) (ST) (cat:LB2) (H)
1 NU-6F7 $2.50 National Union 90% / 90% 950:450 / 700:315Gm used fair (L) (ST) (cat:LB2) engraved base (H)
1 6F7 $2.00 Philco 110% / 60% 1050:450 / 700:315Gm used fair (L) (ST) (cat:LB2) engraved base (H)
1 6F7 / VT-70 $1.00 Ken-Rad 90% / 60% 950:200 / 700:315Gm used fair (L) (ST) (cat:LB2) (H)
1 6F7 $0.50 Ken-Rad 110% / 10% 1250:50 / 700:315Gm used weak (L) (ST) (cat:LB2) (H)
1 6F7 $2.00 Ken-Rad 80% / 110% 1000:400 / 700:315Gm used fair (L) (ST) (cat:LB2) (H)
1 12A7 $1.00 RCA 110% Diode:20% 1500 / 610Gm Used Weak (ST) intermittent short
1 12A7 $1.50 Ken-Rad 120% Diode:120% 1300 / 610Gm Used Leaky (1M) (ST) engraved base - black coat
1 12Z3 $0.50 RCA 100% --- Used Leaky (1M) Rectifier (ST) engraved base - cat:401-504
1 12Z3 $0.50 RCA / Cunningham 95% --- Used Leaky (5M) Rectifier (ST) engraved base - cat:403-109
1 12Z3 $0.50 Super Silvertone55% --- Used Leaky (500K) Rectifier (ST) engraved base - paint on tube
1 25Z5 $2.50 RCA Victor 100% / 100% --- Used Rectifier (ST) resoldered pins
1 25Z5 $0.50 Raytheon 50% / 50% --- Used weak Rectifier (ST)
1 25Z5 $2.50 National Union 95% / 95% --- Used Rectifier (ST) resoldered pins
1 25Z5 $2.50 Sylvania 110% / 110% --- Used leaky Rectifier (ST) loose base
1 485 $6.00 National Union 70% 1200 / 1300Gm used fair (L) black cylinder plate (cat:BL2)
1 485 $7.50 National Union 55% --- used weak (L) single wing mesh cylinder plate (cat:BL2)
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