MDB Ventures Low Grade Tubes

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Type: 6AQ5 , 12AQ5 , 6AQ8 , ECC85 , 6BA7 , 6BM8 , 6BQ5 , 6DA6 , EF89 , 6DJ8 , 6922 , 6DJ8/6922 , 6DT8 , 6ES8 , ECC189 , 6EV7 , 6FQ7 , 6GM8 , 6GK6 , 6J5 , 6JX8 , ECH84 , 6K6 , 6P5 , 6Y6 , 6KE8 , 6X4 , 6X5 , 6202 , 8CG7/8FQ7 , 8EM5 , 12AT7 , 12AU7 , 12AV7 , 12AX7 , 12AY7 , 12X4 , 16A8 , 5670 , 6267 , EF86 , 6883 , 6973

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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 6AQ5 $0.50 RCA 100% 3400/4100Gm Used (M7) 1 6AQ5 $0.50 Philco 110% 2800/4100Gm Used (M7) black coat 1 6AQ5 $0.50 Motorola 100% 2400/4100Gm Used (M7) grid 'c' clip 1 6AQ5 $0.50 unknown 100% 3000/4100Gm Used (M7) black coat - grid 'c' clip 1 6AQ5 $0.50 unknown 120% 3000/4100GmGm Used (M7) grid 'c' clip 1 12AQ5 $0.50 Rogers 110% 3500/4100Gm used (L) (M7) 1 12AQ5 $0.50 FoMoCo 110% 3400/4100Gm used (L) (M7) grid 'c' clip 1 6AQ8/ECC85 $1.00 Siemens 120%/80% 3800:3000/4000Gm used leaky (5M) (wb) (M9) smooth rectangular gray plates - Germany 1 6AQ8/ECC85 $0.50 Valvo 30%/90% 1500:2800/4000Gm used leaky (250K) (wb) (M9) smooth rectangular gray plates 1 6AQ8/ECC85 $4.00 Telefunken 50%/90% 2200:1400/4000Gm used (wb) (M9) smooth rectangular gray plates 1 6AQ8/ECC85 $4.00 Mullard for Eico 70%/60% 3200:3000/4000Gm used (L) (M9) smooth rectangular gray plates 1 6BA7 $0.50 RCA 120%/125% --- used leaky (2M) (L) Compactron (cat:L-H) 1 6BA7 $0.50 RCA 120%/125% --- used leaky (5M) (L) Compactron (cat:L-H) 1 6BM8/ECL82 $1.00 Amperex 80%/120% 70/65dmc used (rb) (M9) Holland 1 6BM8/ECL82 $0.50 Motorola 80%/75% 70/60dmc used (L) (M9) Britain 1 6BQ5 $1.00 Gonset by Sylvania 85% Used Fair 4800/7500Gm Used Weak (M9) (LG-2) 1 6BQ5 $0.50 Philco 35% 5000/7500Gm Used Weak (M9) (LG-2) 1 6BQ5 $0.50 unknown 35% 3000/7500Gm Used Weak (M9) (LG-2) 1 6BQ5 $0.50 Sylvania 40% 4500/7500Gm Used Weak (M9) (LG-2) 1 6BQ5 $0.50 unknown 35% 5000/7500Gm Used Weak (M9) (LG-2) 1 6BQ5 $0.50 Zenith 130% 8000/7500Gm Used Leaky (200K) (M9) (LG-2) 1 6BQ5 $0.50 Zenith 140% 9000/7500Gm Used Leaky (300K) (M9) (LG-2) 1 6BQ5 $0.25 CBS 25% 3000/7500Gm Used Weak (M9) (LG-2) 1 6BQ5 $0.25 RCA 25% 4500/7500Gm Used Weak (M9) (LG-2) 1 6BQ5 $0.25 Tung-Sol 20% 1000/7500Gm Used Leaky (1M) (M9) (LG-2) 1 6BQ5 $0.25 unknown 10% 4000/7500Gm Used Weak (M9) (LG-2) 1 6BQ5 $0.25 unknown 20% 20DMC Used Weak (M9) (LG-2) 1 6BQ5 $0.25 RCA 20% --- Used Weak (M9) (LG-2) 1 6BQ5 $0.50 RCA 40% --- Used Weak (M9) (LG-2) 1 6BQ5 $0.50 Curtis Mathis 50% 6000/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.25 unknown (usa) 25% 1800/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.50 unknown 100% 6500/7500Gm Used Leaky (2M) (M9) (cat:LG-2) 1 6BQ5 $0.50 unknown 50% 4600/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $1.00 unknown (usa) 60% 5200/7500Gm Used Fair (M9) (cat:LG-2) 1 6BQ5 $1.00 unknown (usa) 70% 4000/7500Gm Used Fair (M9) (cat:LG-2) 1 6BQ5 $1.00 Zenith 130% 9000/7500Gm Used leaky (1M) (M9) (cat:LG-2) 1 6BQ5 $1.00 unknown 140% 9500/7500Gm Used leaky (3M) (M9) (cat:LG-2) 1 6BQ5 $1.00 Sylvania 75% 4200/7500Gm Used fair (M9) (cat:LG-2) 1 6BQ5 $0.50 Baldwin 50% 7500/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.50 ITT 110% 10000/7500Gm Used leaky (2M) (M9) (cat:LG-2) 1 6BQ5 $0.50 unknown 40% 3500/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.25 unknown 30% 6500/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.25 Curtis Mathis 30% 2200/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.25 Curtis Mathis 25% 2500/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.25 Philco 10% 1000/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.25 RCA 20% 3000/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.25 RCA 25% 2000/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.25 RCA 30% 3500/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.25 unknown 45% 6500/7500Gm Used weak (M9) (cat:LG-2) 1 6BQ5 $0.50 unknown 85% 3400/7500Gm Used weak (M9) (cat:LG-2) 1 6FQ7 $1.00 Sylvania 85%/95% 2000:2150/2600Gm used (L) (M9) square gray plates - green lettering (cat:LG-2) 1 6FQ7 $1.00 GE 70%/100% 2650:2900/2600Gm used (L) (M9) ribbed rectangular gray plates - red lettering (cat:LG-2) 1 6DA6/EF89 $5.00 Telefunken 100% 2900/2500Gm used leaky 5M (rb) (M9) diamond base (cat:au-30) 1 6DA6/EF89 $0.50 Telefunken 10% 20dmc used weak (wb) (M9) diamond base (cat:au30) 1 6DA6/EF89 $3.00 Siemens 70% 1950/2500Gm used (rb) (M9) (cat:au-30) 1 6DJ8 $2.00 Sylvania 75%/75% 55/60dmc used fair (L) JAN(cat:LH1) 1 6922 $1.00 unknown (usa) 65%/85% 70/65dmc used fair (L) ---(cat:LH1) 1 6922 $1.00 RCA 100%/65% 120/100dmc used fair (L) ---(cat:LH1) 1 6DJ8/ECC88 $4.00 Fisher 80%/110% 8000:7500/8000Gm used leaky (5M) (wb) (M9) britain 1 6DJ8/ECC-88 $3.00 Amperex 75%/100% 65/120dmc used fair (L) ---(cat:LH1) 1 6DT8 $0.50 RCA 100%/110% 5000:4800/4000Gm used leaky (500K) (wb) (M9) oval black plates (6V 12AT7 with shield) 1 6ES8/ECC189 $0.50 Philco 130%/130% 8500:8000/8000Gm used leaky (5M) (rb) (M9) Holland (cat:au-28) 1 6EV7 $1.00 Sylvania 100%/80% 3700:2700/4000Gm used leaky (2M) (rb) (M9) retangular ribbed gray plates - top getter - yellow lettering (cat:au23) 1 6GK6 $0.50 RCA 95% 4500/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.50 RCA 75% 6500/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.50 RCA 70% 4000/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.50 RCA 60% 6500/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.50 RCA 50% 6500/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.50 Zenith 110% 6500/7500Gm Used leaky (500K) (L) (M9) (cat:LG-2) 1 6GK6 $0.50 Zenith 110% 8000/7500Gm Used leaky (1M) (L) (M9) (cat:LG-2) 1 6GK6 $0.50 Zenith 50% 7000/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.50 Westinghouse 80% 6000/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.50 unknown 100% 7250/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.50 unknown (usa) 135% 10500/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.50 GE 120% 8500/7500Gm Used leaky (3M) (L) (M9) (cat:LG-2) 1 6GK6 $0.25 RCA 30% 5000/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.25 RCA 20% 5500/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.25 Westinghouse 20% 4500/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.25 unknown (usa) 10% 400/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.25 unknown 20% 200/7500Gm Used (L) (M9) (cat:LG-2) 1 6GK6 $0.50 Motorola 135% 8500/7500Gm Used leaky (3M) (L) (M9) (cat:LG-2) 1 6GK6 $0.50 Motorola 140% 8000/7500Gm Used leaky (5M) (L) (M9) (cat:LG-2) 1 6GK6 $0.50 Motorola 140% 8750/7500Gm Used leaky (1M) (L) (M9) (cat:LG-2) 1 6GK6 $0.50 Motorola 130% 7500/7500Gm Used leaky (300K) (L) (M9) (cat:LG-2) 1 6J5-G $7.50 Super Silvertone 80% 1500/2000Gm Used fair (L) (ST) rect. rib. plate - grid 'c' clip 1 6J5-G $7.50 Zenith 80% 1550/2000Gm Used fair (L) (ST) oval plate - engraved base 1 6J5-G $5.00 Zenith 70% 1300/2000Gm Used fair (L) (ST) oval plate - engraved base 1 6J5-G $5.00 Sylvania 70% 1250/2000Gm Used fair (L) (ST) oval plate - grid 'c' clip - green lettering 1 6J5-G $5.00 Super Silvertone 65% 1000/2000Gm Used fair (L) (ST) rect. rib. plate - grid 'c' clip 1 6J5-G $5.00 Super Silvertone 65% 1100/2000Gm Used fair (L) (ST) oval plate - engarved plate 1 6J5-G $5.00 RCA 65% 1100/2000Gm Used fair (L) (ST) rect. rib. plate 1 6JX8/ECH84 $0.50 Telefunken 130%/60% 100/70dmc used fair (wb) (M9) diamond base (cat:au-30) 1 6K6-G $1.00 Wards Super Airline 80% 1350/1600Gm Used fair (L) (ST) black coat - grid 'c' clip (L1-H) 1 6K6-GT $1.00 Majestic 85% 1700/1600Gm Used good (L) (ST) black coat (L1-H) 1 6P5-G $10.00 Super Silvertone 70% 1100/1450Gm Used fair (L) (ST) --- 1 6P5-G $10.00 Super Silvertone 100% 1600/1450Gm Used leaky (1M) (L) (ST) --- 1 6X5-G $5.00 Zenith 80%/90% --- Used fair (L) (ST) --- 1 6X5-G $5.00 RCA 90%/80% --- Used fair (L) (ST) (cat:401-465) 1 6Y6-G $1.00 Sylvania 80% 5000/5000Gm Used good (L) (ST) gray coat - JAN (L1-H) 1 6Y6-G $1.00 Sylvania 85% 6500/5000Gm Used good (L) (ST) gray coat - JAN (L1-H) 1 6Y6-G $1.00 Philco 90% 5000/5000Gm Used good (L) (ST) gray coat (L1-H) 1 6Y6-G $1.00 Philco 80% 7000/5000Gm Used good (L) (ST) clear glass (L1-H) 1 6KE8 $1.00 RCA 100%/60% 110/100dmc used (OB) (cat:tx-24) 1 6KE8 $1.00 RCA 110%/80% 80/80dmc used (OB) (cat:tx-24) 1 6KE8 $1.00 RCA 80%/110% 50/70dmc used (OB) (cat:tx-24) 1 6KE8 $1.00 unknown 110%/80% 100/90dmc used (rb) (cat:tx-24) 1 6KE8 $0.50 Magnavox 110%/70% 40/90dmc used leaky 5M (rb) (cat:tx-24) 1 6202 $1.00 GE 100%/100% --- used leaky (1M) (rb) (M7) red lettering - special 6X4 (cat:au-27) 1 6X4 $1.00 GE 120%/120% --- used leaky (3M) (OB) (M7) white lettering (cat:au-27) 1 8CG7/8FQ7 $0.50 GE 110%/130% 2300:2800/2600Gm used leaky (1M) (L) (M9) rectangular gray plate - top getter - white letters (cat:au-21) 1 8EM5 $0.50 RCA 80% 9000/7500Gm used fair (OB) (M9) (cat:LG-2) 1 8EM5 $0.50 RCA 80% 6000/7500Gm used fair (OB) (M9) (cat:LG-2) 1 8EM5 $0.25 RCA 55% 4000/7500Gm used weak (L) (M9) (cat:LG-2) 1 12AT7/ECC81 $3.00 Philips Miniwatt 100%/110% 4000:4000/4000Gm used leaky (2M) (ob) (M9) gray oval plates (cat:au-19) 1 12AT7/ECC81 $5.00 Tungsram 60%/100% emission --- used fair smooth gray plates - made in Hungary 1 12AT7/ECC81 $5.00 Amperex 50%/100% emission 3000:4000/4000Gm used fair single wing rectangular gray plates - bugle boy 1 12AU7/ECC82 $2.50 Amperex 60%/100% 1750:2450/2200Gm used fair (OB) (M9) bugle boy - Holland - rectangular ribbed gray plates 1 12AV7 $0.50 Sylvania 120%/120% 5100:4900/4100Gm used leaky (5M) (OB) (M9) oval gray plates - green letters (cat:au-24) 1 12AX7/ECC83 $5.00 Telefunken 60%/50% 1250:1100/1250Gm used weak (OB) (M9) rectangular ribbed gray plates - Germany 1 12AX7A/ECC83 $5.00 Realistic 80%/80% 1000:1000/1250Gm used fair (L) (M9) smooth oval gray plates - top halo getter - Poland 1 12AY7 $0.50 GE 50%/55% 800:850/1250Gm used weak (L) (M9) (L-BH) 1 12AY7 $0.50 Sylvania 40%/50% 650:700/1250Gm used weak (L) (M9) (L-BH) 1 12AY7 $0.50 RCA 70%/50% 850:700/1250Gm used weak (L) (M9) (L-BH) 1 12AY7 $0.50 unknown 85%/85% 850:1050/1250Gm used leaky (L) (M9) (L-BH) 1 12AZ7 $1.50 Packard Bell 130%/140% 4400:5000/4100Gm used leaky (5M) (OB) (M9) tripple mica - tall rect. black plates 1 12X4 $1.00 Raytheon 120%/120% --- used leaky (5M) (OB) (M7) (cat:au-27) 1 16A8/PCL82 0.50 Zenith 80%/50% 80/90dmc used leaky (2M) (OB) (M10) usa 1 5670 $0.50 unknown 100%/100% 4500:4700/5000Gm used leaky (5M) (L) (M9) (5670/2C51/396A) (cat:au-23) 1 GB-5670 $0.50 Sylvania 50%/50% 1400:1800/5000Gm used (L) (M9) (5670/2C51/396A) - gold brand (cat:au-23) 1 6267/EF86 $7.50 IEC/Mullard 110% 2150/2000Gm used leaky (3M) (ob) (M9) mesh plate - Holland (cat:au-30) 1 6267/EF86 $5.00 Amperex 115% 2000/2000Gm used leaky (1M) (ob) (M9) mesh plate - France (cat:au-30) 1 6267/EF86 $4.00 IEC/Mullard 50% 1500/2000Gm used (ob) (M9) smooth gray plate - Britain (cat:au-30) 1 6267/EF86 $2.00 Valvo 30% 500/2000Gm used (rb) (M9) mesh plate (cat:au-30) 1 6883 $1.00 RCA 75% 6500/7000Gm Used (L) (M9) (cat:G2 - 402-150-1) 1 6883 $1.00 RCA 75% 6500/7000Gm Used (L) (M9) (cat:G2 - 402-150-2) 1 6973 $2.50 unknown 60% 50dmc used weak (L) (cat:14) --- 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