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 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 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 6BJ6A $1.00 Sylvania 120% 3200 / 2500Gm used leaky (1M) (OB) green lettering - JAN
1 6FQ7 $1.00 Sylvania 85% / 95%2000: 2150 / 2600Gm used (L) (M9) square gray plates - green lettering (cat:LH-1)
1 6FQ7 $1.00 GE 70% / 100%2650: 2900 / 2600Gm used (L) (M9) ribbed rectangular gray plates - red lettering (cat:LH-1)
1 6DA6 / EF89 $5.00 Telefunken 100% 2900 / 2500Gm used leaky 5M (rb) (M9) diamond base (cat:au-30)
1 6DA6 / EF89 $3.00 Siemens 70% 1950 / 2500Gm used (rb) (M9) (cat:au-30)
1 6DT8 $0.50 RCA 100% / 110% 5000: 4800 / 4000Gm used leaky (500K) (wb) (M9) oval black plates (6V 12AT7 with shield)
1 6GK6 $0.50 RCA 95% 4500 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.50 RCA 75% 6500 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.50 RCA 70% 4000 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.50 RCA 60% 6500 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.50 RCA 50% 6500 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.50 Zenith 110% 6500 / 7500Gm Used leaky (500K) (L) (M9) (cat:LH-1)
1 6GK6 $0.50 Zenith 110% 8000 / 7500Gm Used leaky (1M) (L) (M9) (cat:LH-1)
1 6GK6 $0.50 Zenith 50% 7000 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.50 Westinghouse 80% 6000 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.50 unknown 100% 7250 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.50 unknown (usa) 135% 10500 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.50 GE 120% 8500 / 7500Gm Used leaky (3M) (L) (M9) (cat:LH-1)
1 6GK6 $0.25 RCA 30% 5000 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.25 RCA 20% 5500 / 7500Gm Used (L) (M9) (cat:LH-1
1 6GK6 $0.25 Westinghouse 20%4500 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.25 unknown (usa) 10% 400 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.25 unknown 20% 200 / 7500Gm Used (L) (M9) (cat:LH-1)
1 6GK6 $0.50 Motorola 135% 8500 / 7500Gm Used leaky (3M) (L) (M9) (cat:LH-1)
1 6GK6 $0.50 Motorola 140% 8000 / 7500Gm Used leaky (5M) (L) (M9) (cat:LH-1)
1 6GK6 $0.50 Motorola 140% 8750 / 7500Gm Used leaky (1M) (L) (M9) (cat:LH-1)
1 6GK6 $0.50 Motorola 130% 7500 / 7500Gm Used leaky (300K) (L) (M9) (cat:LH-1)
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 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 6LW6 $10.00 Admiral 120% 7000 / 6000Gm used (L) dual top halo getters - grid clip - loose cap
1 6LW6 $10.00 GE 120% 7000 / 6000Gm used (L) dual top halo getters - grid clip - loose cap
1 26LW6 $5.00 GE 100% 6000 / 6000Gm used (L) white lettering - dual top halo getter - grid clip - loose cap
1 36LW6 $5.00 Admiral 100% 6500 / 6000Gm used (L) dual side halo getter - screen grid fins - loose cap
1 36LW6 $5.00 Lindal 130% 6500 / 6000Gm NOS (OB) white lettering - dual top halo getter - grid clip
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:LH-1)
1 8EM5 $0.50 RCA 80% 6000 / 7500Gm used fair (OB) (M9) (cat:LH-1)
1 8EM5 $0.25 RCA 55% 4000 / 7500Gm used weak (L) (M9) (cat:LH-1)
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 12AX7A / ECC83 $5.00 Realistic 80% / 80% 1000: 1000 / 1250Gm used fair (L) (M9) smooth oval gray plates - top halo getter - Poland
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 4604 $0.50 RCA --- untested used (L) (GT)
1 5670 $0.50 unknown 100% / 100% 4500: 4700 / 5000Gm used leaky (5M) (L) (M9) (5670/2C51/396A) (cat:au-23)
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 $1.00 unknown 60% 50dmc used weak (L) (cat:14) ---
1 7061 $0.50 EF Johnson 110% 4400 / 3600Gm used leaky (500K) (rb) ---
1 7061 $0.50 RCA 110% 4000 / 3600Gm 85dmc used leaky (2M) (L) for EF Johnson
1 7119 $0.50 Amperex PQ shorted --- used shorted (wb) has internal element short

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