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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 | 1U5 | $1.00 | unknown | 80% diode:110% | 500/525Gm | used fair (L) | (M7) (cat:low-1D)
| | 1 | 1R5 | $1.00 | RCA | 120% | 950/525Gm | used good (L) | (M7) (cat:low-1D)
| | 1 | 1S5 | $1.00 | Raytheon | 85% diode:100% | 600/525Gm | used good (L) | (M7) (cat:low-1D)
| | 1 | 2AP1 | $2.50 | Philips Norelco | --- | --- | Used Weak emission | 2 inch CRT
| | 1 | 2C34/RK34/VT-224 | $1.00 | National Union | 110%/110% | --- | Used leaky (5M) | (ST) rabbit ear tube - rectangular black plates
| | 1 | 2C39 | $2.50 | RCA | 50% | --- | Used weak | ---
| | 1 | 2C40 | $10.00 | RCA | 90% | 3000/2800Gm | Used Leaky (1M) | ---
| | 1 | 2C40 | $10.00 | GE | 70% | 3000/2800Gm | Used fair | ---
| | 1 | 2C43 | $7.50 | GE | 70% | 3200/4000Gm | Used fair | ---
| | 1 | 2C43 | $7.50 | GE | 75% | 3600/4000Gm | Used fair | ---
| | 1 | 2C43 | $7.50 | GE | 80% | 3800/4000Gm | Used fair | ---
| | 1 | 2C43 | $4.00 | GE | 70% | 3800/4000Gm | Used Leaky (3M) | ---
| | 1 | 2C43 | $4.00 | GE | 90% | 4700/4000Gm | Used Leaky (2M) | ---
| | 1 | 2C43 | $4.00 | GE | 80% | 4000/4000Gm | Used Leaky (3M) | ---
| | 1 | 2C43 | $4.00 | GE | 80% | 4100/4000Gm | Used Leaky (2M) | ---
| | 1 | 2C43 | $4.00 | GE | 60% | 3000/4000Gm | Used Leaky (2M) | ---
| | 1 | 2C43 | $4.00 | GE | 60% | 2400/2800Gm | Used fair | ---
| | 1 | 2C44 | $5.00 | RCA | 90% | --- | Used Leaky (500K) | ---
| | 1 | 2DV4 | $1.00 | Zenith | 60% | --- | used fair (rb) | Nuvistor (cat:LD-1)
| | 1 | 3B24 | $5.00 | Western Electric | 40% | --- | used weak | JAN - engraved base
| | 1 | 3B24 | $1.00 | Raytheon | 30% | --- | used weak | JAN - brown base
| | 1 | 3B24-W | $1.00 | Raytheon | 20% | --- | used weak | brown base
| | 1 | 3B25 | $1.00 | RCA | 40% | --- | used weak | ---
| | 1 | 3B28 | $1.00 | United Electronics | 60% | --- | used fair | brown base - bayonet pin
| | 1 | 3C24/24G | $2.50 | Eimac | 50% | --- | used weak | ---
| | 1 | 3E29 | $5.00 | RCA | 80%/90% | --- | Used Fair | --
| | 1 | 5R4WGB | $1.00 | Raytheon | 60%/80% | --- | Used Fair | JAN Gray base
| | 1 | 5R4WGA | $1.00 | Chatham | 50%/50% | --- | Used Fair | JAN Tan base
| | 1 | 5R4WGY | $1.00 | Chatham | 60%/60% | --- | Used Fair | JAN Brown base
| | 1 | 5R4WGY | $2.00 | Chatham | 110%/110% | --- | Used | JAN Brown base - white particles inside
| | 1 | 6AR6 | $1.50 | Tung-Sol | 70% | 4400/5400Gm | Used Fair | (GT) brown base - JAN
| | 1 | 6AR6 | $2.00 | Tung-Sol | 75% | 4800/5400Gm | Used Fair | (GT) brown base - JAN
| | 1 | 6AR6 | $2.50 | Tung-Sol | 80% | 5000/5400Gm | Used Fair | (GT) brown base - JAN
| | 1 | 6AR6 | $2.50 | Tung-Sol | 80% | 5000/5400Gm | Used Fair | (GT) brown base - JAN
| | 1 | 6AR6 | $1.00 | Tung-Sol | 110% | 6700/5400Gm | Used Leaky | (GT) brown base - JAN
| | 1 | 6AR6 | $1.00 | Tung-Sol | 60% | 4100/5400Gm | Used Leaky | (GT) brown base - JAN
| | 1 | 6AR6 | $1.50 | Tung-Sol | 70% | 4400/5400Gm | Used Fair | (GT) brown base
| | 1 | 6DS4 | $1.00 | RCA | 80% | --- | used fair (rb) | Nuvistor (cat:LD-1)
| | 1 | 6DS4 | $1.00 | RCA | 80% | --- | used fair (rb) | Nuvistor (cat:LD-1)
| | 1 | 6DS4 | $1.00 | RCA | 80% | --- | used fair (rb) | Nuvistor (cat:LD-1)
| | 1 | 6DS4 | $1.00 | RCA | 80% | --- | used fair (rb) | Nuvistor (cat:LD-1)
| | 1 | 6DS4 | $1.00 | RCA | 75% | --- | used fair (rb) | Nuvistor (cat:LD-1)
| | 1 | 6DS4 | $1.00 | RCA | 70% | --- | used fair (rb) | Nuvistor (cat:LD-1)
| | 1 | 6DS4 | $1.00 | RCA | 70% | --- | used fair (rb) | Nuvistor (cat:LD-1)
| | 1 | 6DS4 | $1.00 | RCA | 65% | --- | used fair (rb) | Nuvistor - light rust on tube (cat:LD-1)
| | 1 | 6ML8 | $0.50 | unknown | 110%/105%/110% | 90/80/90dmc | used leaky (2M) (OB) | (cat:LD-1)
| | 1 | 6ML8 | $0.50 | Sylvania | 130%/135%/130% | 110/120/115dmc | used leaky (2M) (OB) | (cat:LD-1)
| | 1 | 6ML8 | $0.50 | unknown | 70%/100%/100% | 50/70/80dmc | used leaky (1M) (L) | (cat:LD-1)
| | 1 | 407A | $2.50 | Westinghouse | 70%/65% | --- | used (rb) | (M9)
| | 1 | 446A | $2.00 | GE | 110% | 3200/1560Gm | Used Leaky (500K) | ---
| | 1 | 446A | $2.00 | GE | 70% | 4200/1560Gm | Used fair | ---
| | 1 | 446A | $1.00 | RCA | 60% | 2400/1560Gm | Used leaky (1M) | ---
| | 1 | 446A | $2.00 | RCA | 50% | 2300/1560Gm | Used weak | ---
| | 1 | 572-B | $1.00 | Cetron | --- | --- | used | weak - bayonet pin - heater 1/2 dead - graphite plate - display
| | 1 | NU-615/VT-235 | $5.00 | Philco | 100% | 2300/2200Gm | used leaky (5M) | rabbit ear tube - similar to E1148
| | 1 | 954/VT-120 | $0.50 | Tung-Sol | --- | 800/1100Gm | used fair (rb) | Acorn
| | 1 | 955 | $0.50 | RCA | --- | 1350/1900Gm | used fair (rb) | Acorn
| | 1 | 955/VT-121 | $0.50 | GE | --- | 1500/1900Gm | used fair (rb) | Acron
| | 1 | 959 | $0.50 | RCA | --- | 300/900Gm | used fair (rb) | Acron
| | 1 | 1616 | $2.50 | Hytron | 50% | --- | Used Weak | --
| | 1 | 1619 | $2.50 | RCA | 30% | 1100/3400Gm | Used weak (rb) | 2.5V 6L6 - metal tube - in Addison TV Parts Ltd Montreal box
| | 1 | 6173 | $0.50 | unknown | dead | no heeater | used (rb) | display only
| | 1 | 6336B | $2.50 | Cetron | intermittent grid short | --- | Used | ceramic base - metal supports - graphite plates
| | 1 | 6550 | $0.50 | GE | 20% | --- | used weak (wb) | broken locator pin (cat:604-10 : LH)
| | 1 | 7586 | $0.50 | RCA | 55% | --- | used weak (L) | Nuvistor
| | 1 | 7586 | $0.50 | RCA | 40% | --- | used weak (L) | Nuvistor
| | 1 | 8156 | $0.50 | GE | 10% | 10dmc | Used weak | Compactron - (cat:1g)
| | 1 | 12E1/CV345 | $5.00 | unknown | 70% | --- | Used Fair | cat:401-335
| | 1 | 12E1/CV345 | $2.00 | unknown | 150% | --- | Used Gassy | --
|
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.
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