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 2E24 $1.00 RCA 110% 3300 / 3200 used (rb) ---
1 2E24 $1.00 RCA 110% 3300 / 3200 used (rb) ---
1 2E24 $1.00 RCA 110% 3600 / 3200 used (rb) ---
1 2E26 $1.00 RCA 110% 4600 / 3500 used (rb) (cat:403-239-60)
1 2E26 $1.00 RCA 110% 5000 / 3500 used (rb) (cat:403-239-53)
1 2E26 $1.00 RCA 110% 4600 / 3500 used (rb) (cat:403-239-7)
1 2E26 $1.00 Westinghouse 120% 4200 / 3500 used (rb) (cat:403-236-5)
1 2E26 $1.00 RCA 110% 4600 / 3500 used (rb) ---
1 2E26 $1.00 RCA 120% 4900 / 3500 used (rb) (cat:403-239-51)
1 6146 $0.25 Westinghouse 20% 1000 / 7000Gm Used weak (L) (GT) loose cap
1 6146 $0.25 Westinghouse 10% 550 / 7000Gm Used weak (L) (GT) loose cap
1 6146 $0.50 Westinghouse 50% 1300 / 7000Gm Used leaky (5M) (L) (GT) ---
1 6146 $0.25 Westinghouse 40% 1000 / 7000Gm Used weak (L) (GT) ---
1 6146 $1.00 Westinghouse 70% 2200 / 7000Gm Used weak (L) (GT) ---
1 6146 $1.00 Westinghouse 60% 2500 / 7000Gm Used weak (L) (GT) ---
1 6146 $2.00 Westinghouse 80% 3500 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.25 GE 10% 500 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.25 GE 20% 750 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.50 GE 50% 8000 / 7000Gm Used weak (L) (GT) ---
1 6146A $0.50 GE 60% 3500 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.50 GE 60% 2000 / 7000Gm Used weak (L) (GT) ---
1 6146A $0.50 GE 60% 2500 / 7000Gm Used weak (L) (GT) ---
1 6146B / 8298A $0.50 GE 80% 2500 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.50 GE 60% 2000 / 7000Gm Used leaky (500K) (L) (GT) JAN
1 6146A $1.00 GE 120% 7500 / 7000Gm Used leaky (1M) (L) (GT) ---
1 6146 $0.25 GE 100% 8000 / 7000Gm Used (L) (GT) heater cathode short
1 6146 $5.00 GE 100% 5000 / 7000Gm Used fair (L) (GT) ---
1 6146 $4.00 GE 90% 4500 / 7000Gm Used fair (L) (GT) cat:402-390
1 6146B / 8298A $4.00 GE 90% 5000 / 7000Gm Used fair (L) (GT) ---
1 6146B / 8298A $4.00 GE 90% 5000 / 7000Gm Used fair (L) (GT) ---
1 6146 $3.00 GE 75% 8000 / 7000Gm Used fair (L) (GT) ---
1 6146 $5.00 GE 120% 7500 / 7000Gm Used good (L) (GT) broken locator pin
1 6146 $3.00 Tung-Sol 75% 5000 / 7000Gm Used fair (L) (GT) ---
1 6146 $0.25 Tung-Sol 20% 900 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.50 Tung-Sol 50% 2500 / 7000Gm Used weak (L) (GT) ---
1 6146 $1.00 Tung-Sol 100% 7500 / 7000Gm Used leaky (5M) (L) (GT) ---
1 6146W $1.00 Tung-Sol 120% 9500 / 7000Gm Used good (OB) (GT) broken locator pin - JAN
1 6146A $1.00 Sylvania 90% 8000 / 7000Gm Used leaky (2M) (L) (GT) ---
1 6146 $0.50 Raythoen 60% 2500 / 7000Gm Used leaky (4M) (L) (GT) ---
1 6146 $0.75 CBS 80% 6000 / 7000Gm Used leaky (2M) (L) (GT) ---
1 6146 $4.00 Daystrom 100% 8000 / 7000Gm Used good (rb) (GT) broken locator pin
1 6146B $2.00 Toshiba 80% 7500 / 7000Gm Used fair (L) (GT) ---
1 6146B $2.00 Toshiba 70% 5500 / 7000Gm Used fair (L) (GT) ---
1 6146 $0.75 RCA 75% 4500 / 7000Gm Used leaky (700K) (L) (GT) ---
1 6146 $0.25 RCA 25% 1000 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.50 RCA 70% 2500 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.50 RCA 60% 2000 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.40 RCA 50% 1800 / 7000Gm Used weak (L) (GT) loose cap
1 6146 $0.50 RCA 60% 1700 / 7000Gm Used weak (L) (GT) ---
1 6146A $0.50 RCA 60% 3800 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.25 RCA 40% 1200 / 7000Gm Used weak (L) (GT) ---
1 6146A $1.00 RCA 110% 7500 / 7000Gm Used leaky (1M) (L) (GT) ---
1 6146 $0.25 RCA 10% 500 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.50 RCA 60% 2200 / 7000Gm Used weak (L) (GT) ---
1 6146A $0.40 RCA 50% 3000 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.50 RCA 60% 4200 / 7000Gm Used weak (L) (GT) ---
1 6146W / 7212 $1.00 RCA 110% 7000 / 7000Gm Used leaky (5M) (L) (GT) ---
1 6146 $0.25 RCA 30% 750 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.50 RCA 90% 3000 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.25 RCA 20% 600 / 7000Gm Used weak (L) (GT) ---
1 6146A $0.25 RCA 40% 800 / 7000Gm Used weak (L) (GT) ---
1 6146B / 8298A $0.50 RCA 60% 3800 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.50 RCA 50% 2000 / 7000Gm Used weak (L) (GT) ---
1 6146 $0.25 RCA 150% 5000 / 7000Gm Used gassy (L) (GT) cat:402-394-5
1 6146 $1.00 RCA 90% 2600 / 7000Gm Used leaky (1M) (L) (GT) ---
1 6146B / 8298A $0.50 RCA 60% 3000 / 7000Gm Used leaky (2M) (L) (GT) ---
1 6146 $0.50 RCA 90% 7500 / 7000Gm Used leaky (5M) (L) (GT) ---
1 6146 $0.50 RCA 90% 8000 / 7000Gm Used leaky (5M) (L) (GT) ---
1 6146 $0.50 RCA 90% 8500 / 7000Gm Used leaky (5M) (L) (GT) ---
1 6146W $2.00 RCA 70% 4000 / 7000Gm Used fair (L) (GT) JAN
1 6146 $2.00 RCA 70% 8000 / 7000Gm Used fair (L) (GT) ---
1 6146 $2.00 RCA 100% 5000 / 7000Gm Used fair (L) (GT) ---
1 6146 $2.00 RCA 70% 5000 / 7000Gm Used fair (L) (GT) ---
1 6146 $2.00 RCA 120% 5000 / 7000Gm Used fair (L) (GT) ---
1 6146 $2.00 RCA 80% 4500 / 7000Gm Used fair (L) (GT) ---
1 6146 $2.00 RCA 80% 6500 / 7000Gm Used fair (L) (GT) ---
1 6146B / 8298A $2.00 RCA 120% 5000 / 7000Gm Used fair (L) (GT) ---
1 8298 $1.00 Westinghouse 100% 3500 / 7000Gm Used weak (rb) (GT) ---
1 8298 $0.25 RCA 20% --- Used fair (L) (GT) ---
1 8298 $2.50 Westinghouse 100% 5500 / 7000Gm Used fair (rb) (GT) cat:402-384
1 6293 $0.25 RCA 20% 400 / 4600Gm Used weak (rb) (GT) ---
1 8252 $0.25 unknown 5% 200 / 7000Gm Used weak (L) (GT) ---
1 8252 $1.00 RCA 120% 9000 / 3500Gm Used leaky (5M) (rb) (GT)
1 7212 $1.00 Tung-Sol 90% 2600 / 7000Gm Used leaky (1M) (L) (GT) ---
1 6883 $1.00 GE 110% 8000 / 7000Gm Used leaky (5M) (rb) (GT) ---
1 6883 $5.00 RCA 100% 5000 / 7000Gm Used fair (rb) (GT) ---
1 6883 $5.00 RCA 80% 6000 / 7000Gm Used fair (rb) (GT) ---
1 6883 $5.00 RCA 80% 5500 / 7000Gm Used fair (rb) (GT) ---
1 6883 $5.00 GE 80% 4000 / 7000Gm Used fair (L) (GT) loose cap
1 6883 $5.00 GE 120% 5500 / 7000Gm Used fair (L) (GT) ---
1 6883 $5.00 RCA 70% 4200 / 7000Gm Used fair (L) (GT) ---
1 6883 $5.00 RCA 110% 4000 / 7000Gm Used fair (L) (GT) ---
1 6883 $1.00 Westinghouse 120% 5500 / 7000Gm Used weak (L) (GT) ---
1 6883 $1.00 Westinghouse 40% 1800 / 7000Gm Used weak (L) (GT) ---
1 6883 $1.00 Westinghouse 40% 1500 / 7000Gm Used weak (L) (GT) ---
1 6883 $1.00 Westinghouse 50% 3200 / 7000Gm Used weak (L) (GT) ---
1 6883-B / 8032-A / 8552 $1.00 RCA 70% 3500 / 7000Gm Used leaky (2M) (L) (GT) white particles inside
1 8032 $0.50 Westinghouse 75% --- Used fair (L) (GT) --- (cat:L-1G)
1 8042 $0.25 Amperex 10%--- Used weak (L) (GT) ---
1 8042 $0.25 Amperex 20%--- Used weak (L) (GT) ---
1 8042 $0.25 Amperex 30%--- Used weak (L) (GT) ---
1 8042 $0.25 Amperex 30%--- Used weak (L) (GT) ---
1 8042 $0.25 Amperex 20%--- Used weak (L) (GT) ---
1 8042 $0.25 Amperex 20%--- Used weak (L) (GT) ---
1 8042 $0.25 Amperex 20%--- Used weak (L) (GT) ---
1 8042 $0.25 Amperex 10%--- Used weak (L) (GT) ---
1 8042 $0.25 Amperex 20%--- Used weak (L) (GT) ---
1 8042 $0.25 Amperex 5%--- Used weak (L) (GT) ---
1 8042 $2.50 Amperex 80%--- Used fair (L) (GT) ---
1 8042 $2.00 Amperex 70%--- Used fair (L) (GT) ---
1 4652 / 8042 $2.00 RCA 60%--- Used fair (rb) (GT) ---
1 4652 / 8042 $2.00 RCA 70%--- Used fair (L) (GT) ---
1 4652 / 8042 $0.50 RCA 40%--- Used weak (L) (GT) ---
1 4652 / 8042 $0.50 RCA 40%--- Used weak (L) (GT) ---

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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sales@mdbventures.com
or
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