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 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 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 $0.25 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 6K6-GT $1.00 Majestic 85% 1700 / 1600Gm Used good (L) (ST) black coat (L1-H)
1 36LW6 $5.00 Admiral 100% 6500 / 6000Gm used (L) dual side halo getter - screen grid fins - loose cap
1 6X5-G $5.00 Zenith 80% / 90% --- Used fair (L) (ST) --- (L1-H)
1 6X5-G $5.00 RCA 90% / 80% --- Used fair (L) (ST) (cat:401-465) (L1-H)
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 12AT6 $0.50 GE 100% diodes 70% / 70% 950 / 1250Gm used (rb) ---
1 12AT6 $0.50 unknown 80% diodes 80% / 90% 750 / 1250Gm used (rb) ---
1 12AT7WA $7.50 RCA 110% / 110% 4000:4000 / 4000Gm used leaky 1M (wb) (M9) small rectangular ribber plates - red lettering
1 12AT7/ECC81 $7.50 Mullard 95% / 100% 3000:3300 / 4000Gm used (wb) (M9) oval gray plates - great britain
1 12AT7/ECC81 $4.00 Mullard for Heath 80% / 100% 2400:3000 / 4000Gm used (wb) (M9) oval gray plates - great britain
1 12AT7/ECC81 $3.00 Mullard 60% / 90% 2100:2300 / 4000Gm used (wb) (M9) oval gray plates - great britain
1 12AT7/ECC81 $3.00 Mullard 60% / 80% 2300:3200 / 4000Gm used (wb) (M9) oval black plates - Italy
1 12AT7 $5.00 Telefunken 70% / 100% 2300:2900 / 4000Gm used (wb) (M9) oval gray plates - diamond base
1 12AT7 $1.00 Telefunken 5% / 5% 0:0 / 4000Gm used (wb) (M9) oval gray plates - diamond base - west germany
1 12AV6 $1.00 unknown 115% diodes 90% / 90% 1000 / 1250Gm used (wb) ---
1 12AV6 $0.50 GE 70% diodes 80% / 90% 600 / 1250Gm used (rb) ---
1 12GN7/12GN7A $0.50 RCA 100% 8000 / 6500Gm used leaky (1M) (rb) (M7)
1 12GN7/12GN7A $0.50 Philco 90% 8050 / 6500Gm used leaky (2M) (rb) (M7)
1 12GN7 $0.50 unknown 85% 9000 / 6500Gm used leaky (3M) (L) (M7)
1 12GN7 $0.50 Philco 80% 8000 / 6500Gm used (L) (M7)
1 12GN7A $0.50 Magnavox 80% 9000 / 6500Gm used (L) (M7)
1 12GN7A $0.50 Magnavox 80% 8500 / 6500Gm used (L) (M7)
1 12GN7A $0.50 Sylvania 80% 8500 / 6500Gm used (L) (M7)
1 12GN7A $0.50 Zenith 80% 8000 / 6500Gm used (L) (M7)
1 12GN7A $0.50 unknown 80% 8000 / 6500Gm used (L) (M7)
1 12AZ7 $1.50 Packard Bell 130% / 140% 4400:5000 / 4100Gm used leaky (5M) (OB) (M9) tripple mica - tall rect. black plates
1 12AZ7A $2.50 Packard Bell 130% / 140% 4400:5000 / 4000Gm used leaky (5M) (L) (M9) tall bottle
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 5963 $0.50 Honeywell 80% / 90% 2050:2400 / 2200Gm used (L) (M9) gray plates (b20) (special 12AU7)
1 5963 $0.50 RCA 85% / 115% 1700:2000 / 2200Gm used (rb) (M9) black plates (b20) (special 12AU7)
1 5963 $0.50 Hewlett Packard by Sylvania 85% / 110% 2350:2750 / 2200Gm used (L) (M9) gray plates (b20) (special 12AU7)
1 5963 $0.50 RCA 80% / 120% 2000:2700 / 2200Gm used (L) (M9) gray plates (b20) (special 12AU7)
1 5963 $0.20 unknown 110% / 60% 3300:1500 / 2200Gm used weak (L) (M9) rectangular black plates
1 5963 $0.20 RCA 100% / 75% 2600:1950 / 2200Gm used (L) (M9) gray plates (b20) (special 12AU7)
1 5963 $0.20 Honeywell 70% / 110% 2250:2600 / 2200Gm used (L) (M9) gray plates (b20) (special 12AU7)
1 5963 $0.20 RCA 75% / 120% 1700:2500 / 2200Gm used (L) (M9) gray plates (b20) (special 12AU7)
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
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