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Type: 71 , 79 , 81 , 83-V , 85 , 89 ( NOS and Used )
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 Preoctal Tubes
Quantity
Available | Tube
Type | Price
Each | Tube
Brand | Emission
Strength | Mutual
Conductance |
Description |
Notes
|
| 1 | 71-A* | $45.00 | Sylvania | 120% | 2000/1650Gm | ST - NOS (wb) | bayonet pin on base - engraved base
| | 1 | 71-A | $35.00 | National Union | 120% | 1800/1650Gm | ST - used (wb) | bayonet pin on base
| | 1 | 71-A | $25.00 | Wards | 90% | 1700/1650Gm | ST - used (wb) | --
| | 1 | 79 | $5.00 | Philco | 115%/115% | 1400/1000:1250/1000 | ST - NOS (wb) | ---
| | 1 | 79 | $5.50 | Philco | untested | heater ok | ST - NOS (OB) | sealed in box
| | 1 | 79 | $5.00 | Philco | 115%/120% | 1200/1000:1050/1000 | ST - NOS (OB) | engraved base
| | 1 | 79 | $4.50 | Philco | 105%/100% | 1100/1000:1050/1000 | ST - NOS (OB) | engraved base
| | 1 | 79 | $5.00 | RCA | 120%/120% | 1150/1000:1200/1000 | ST - NOS (OB) | ---
| | 1 | 79 | $4.50 | RCA/Cunningham | 100%/100% | 1000/1000:1050/1000 | ST - NOS (ob) | damaged box
| | 1 | 79 | $5.50 | RCA/Cunningham | untested | heater ok | ST - NOS (OB) | sealed in box
| | 1 | 79 | $5.50 | RCA/Cunningham | untested | heater ok | ST - NOS (OB) | sealed in box
| | 1 | 79 | $5.00 | RCA | 120%/125% | 1050/1000:1000/1000 | ST - NOS (OB) | box end flap missing
| | 1 | 79 | $5.00 | Zenith | 115%/115% | 1250/1000:1400/1000 | ST - NOS (OB) | ---
| | 1 | 79 | $5.00 | Zenith | 115%/115% | 1250/1000:1400/1000 | ST - NOS (OB) | ---
| | 1 | 79 | $4.75 | National Union | 110%/110% | 1200/1000:1100/1000 | ST - NOS (ob) | water damaged box
| | 1 | 79 | $4.25 | Wizard | 100%/120% | 1100/1000:1250/1000 | ST - NOS (ob) | damaged box
| | 1 | 79 | $4.50 | Sylvania | 110%/115% | 1100/1000:1100/1000 | ST - NOS (wb) | engraved base
| | 1 | 79 | $5.50 | Nu-Star | 140%/105% | 1450/1000:1000/1000 | ST - NOS (ob) | engraved base - damaged box
| | 1 | 79 | $3.50 | Sylvania | 120%/125% | 1400/1000:1200/1000 | ST - used (L) | ---
| | 1 | 79 | $3.50 | Sylvania | 120%/115% | 1200/1000:1250/1000 | ST - used (L) | ---
| | 1 | 79 | $3.50 | Arcturus | 100%/90% | 1000/1000:1000/1000 | ST - used (L) | ribbed cap
| | 1 | 79 | $3.50 | RCA | 120%/110% | 1200/1000:1200/1000 | ST - used (L) | ---
| | 1 | 81 | $9.50 | National Union | 95% | --- | ST - used (L) | engraved base - bayonet pin on base - large bulb - particles inside
| | 1 | 81 | $10.00 | National Union | 100% | --- | ST - used (L) | engraved base - bayonet pin on base - large bulb
| | 1 | 81 | $10.00 | RCA Radiotron | 100% | --- | ST - used (L) | bayonet pin on base - large bulb
| | 1 | 81 | $10.00 | RCA Radiotron | 100% | --- | ST - used (L) | engraved base - bayonet pin on base - large bulb
| | 1 | 81 | $10.00 | RCA Radiotron | 100% | --- | ST - used (L) | bayonet pin on base - large bulb
| | 1 | 81 | $10.25 | RCA | 105% | --- | ST - used (L) | bayonet pin on base - large bulb
| | 1 | 81 | $10.00 | RCA | 100% | --- | ST - used (L) | bayonet pin on base - large bulb - cat:402-340
| | 1 | 81 | $12.00 | Tung-Sol | 120% | --- | ST - used (L) | bayonet pin on base - large bulb - particles inside
| | 1 | 81 | $9.00 | National Union | 90% | --- | ST - used (L) | engraved base - bayonet pin on base - large bulb
| | 1 | 81 | $8.00 | Super Silvertone | 100% | --- | ST - used (L) | bayonet pin on base - small bulb (pl)
| | 1 | 81 | $12.00 | Sylvania | 110% | --- | ST - used (L) | bayonet pin on base - small bulb - rattle inside base - cat:402-339
| | 1 | 81 | $10.00 | Tung-Sol | 100% | --- | ST - used (L) | engraved base - bayonet pin on base - small bulb
| | 1 | 83-V | $18.00 | Sylvania | 120%/120% | --- | ST - NOS (wb) | ---
| | 1 | 83-V | $18.00 | Sylvania | 115%/115% | --- | ST - NOS (wb) | ---
| | 1 | 83-V | $18.00 | Philco | 115%/115% | --- | ST - NOS (OB) | ---
| | 1 | 83-V | $24.00 | Raytheon | 120%/120% | --- | ST - NOS (wb) | engraved base - four pillar tube (pl)
| | 1 | 83-V | $10.00 | National Union | 120%/120% | --- | ST - used (rb) | ---
| | 1 | 83-V | $10.00 | GE | 115%/115% | --- | ST - used (wb) | ---
| | 1 | 83-V | $6.00 | Sylvania | 80%/80% | --- | ST - used (rb) | ---
| | 1 | 83-V | $12.00 | RCA Victor | 120%/120% | --- | ST - used (L) | ---
| | 1 | 83-V | $8.00 | RCA | 110%/100% | --- | ST - used (L) | ---
| | 1 | 83-V | $10.00 | GE | 120%/120% | --- | ST - used (L) | ---
| | 1 | 83-V | $10.00 | Philco | 120%/120% | --- | ST - used (L) | ---
| | 1 | NU-85 | $5.00 | National Union | 100% diodes:120%/110% | 1100/975Gm | ST - used (L) | engraved base
| | 1 | 85 | $3.00 | National Union | 120% diodes:120%/120% | 1250/975Gm | ST - used (L) | ---
| | 1 | 85 | $2.50 | National Union | 95% diodes:120%/120% | 1100/975Gm | ST - used (L) | engraved base
| | 1 | 85 | $3.00 | National Union | 115% diodes:110%/120% | 1250/975Gm | ST - used (L) | engraved base
| | 1 | 85 | $2.00 | Silvertone | 90% diodes:110%/120% | 1000/975Gm | ST - used (L) | engraved base - cat:312-146
| | 1 | 85 | $3.00 | Silvertone | 110% diodes:110%/120% | 1200/975Gm | ST - used (L) | engraved base (pl)
| | 1 | 85 | $3.00 | Silvertone | 150% diodes:120%/120% | 1500/975Gm | ST - used (L) | engraved base - cat:312-134
| | 1 | 85 | $3.00 | Silvertone | 110% diodes:120%/120% | 1200/975Gm | ST - used (L) | engraved base
| | 1 | 85 | $2.50 | Ken-Rad | 100% diodes:120%/120% | 1100/975Gm | ST - used (L) | engraved base
| | 1 | 85 | $2.50 | RCA | 100% diodes:110%/120% | 1200/975Gm | ST - used (L) | ---
| | 1 | 85 | $3.00 | RCA | 110% diodes:125%/120% | 1200/975Gm | ST - used (L) | ---
| | 1 | 85 | $2.50 | RCA | 100% diodes:110%/110% | 1150/975Gm | ST - used (L) | ---
| | 1 | 85 | $3.00 | RCA/Cunningham | 110% diodes:120%/125% | 1200/975Gm | ST - used (L) | engraved base - rattle in base
| | 1 | 85 | $2.50 | Sylvania | 100% diodes:110%/120% | 1200/975Gm | ST - used (L) | engraved base - black coat
| | 1 | 85 | $3.00 | Sylvania | 120% diodes:120%/120% | 1300/975Gm | ST - used (L) | engraved base - black coat
| | 1 | 85 | $3.00 | Sylvania | 110% diodes:115%/125% | 1050/975Gm | ST - used (L) | ---
| | 1 | 85 | $3.00 | Philco | 110% diodes:120%/120% | 1200/975Gm | ST - used (L) | ---
| | 1 | 85 | $3.00 | Philco | 120% diodes:120%/120% | 1350/975Gm | ST - used (L) | ---
| | 1 | 85 | $3.00 | Philco | 110% diodes:115%/120% | 1200/975Gm | ST - used (L) | engraved base
| | 1 | 85 | $2.50 | Tung-Sol | 105% diodes:115%/120% | 1150/975Gm | ST - used (L) | ---
| | 1 | 85 | $2.50 | unknown | 115% diodes:120%/120% | 1350/975Gm | ST - used (L) | ---
| | 1 | 89 | $4.00 | Sylvania | 130% | 2000/1550Gm | ST - used (L) | cat:22-351 (pl)
| | 1 | 89 | $4.00 | Sylvania | 110% | 1600/1550Gm | ST - used (L) | ---
| | 1 | 89 | $3.50 | RCA | 100% | 1700/1550Gm | ST - used (L) | engraved base - paint on tube
| | 1 | 89 | $3.50 | RCA Radiotron | 105% | 1650/1550Gm | ST - used (L) | engraved base - cat:32-651
| | 1 | 89 | $3.00 | RCA | 95% | 1550/1550Gm | ST - used (L) | ---
| | 1 | 89 | $4.00 | RCA/Cunningham | 110% | 1700/1550Gm | ST - used (L) | engraved base
| | 1 | 89 | $4.00 | RCA/Cunningham | 110% | 1750/1550Gm | ST - used (rb) | engraved base
| | 1 | 89 | $3.50 | RCA/Cunningham | 100% | 1550/1550Gm | ST - used (L) | engraved base
| | 1 | 89 | $4.00 | National Union | 120% | 1800/1550Gm | ST - used (L) | engraved base - cat:32-511
| | 1 | 89 | $3.00 | National Union | 100% | 1650/1550Gm | ST - used (L) | engraved base
| | 1 | 89 | $4.00 | Tung-Sol | 130% | 2000/1550Gm | ST - used (L) | engraved base
| | 1 | 89 | $3.50 | Tung-Sol | 100% | 1550/1550Gm | ST - used (L) | engraved base
| | 1 | 89 | $3.50 | Cunningham | 100% | 1600/1550Gm | ST - used (L) | engraved base
| | 1 | 89 | $3.50 | GM | 105% | 1250/1550Gm | ST - used (L) | engraved base
| | 1 | 89 | $3.50 | Super Airline | 100% | 1500/1550Gm | ST - used (L) | engraved base
| | 1 | 89 | $3.50 | Ken-Rad | 100% | 1800/1550Gm | ST - used (L) | black coat
| | 1 | 89 | $2.50 | unknown | 95% | 1500/1550Gm | ST - used (L) | paint on tube
| | 1 | 89 | $4.00 | RCA | 125% | 1750/1550Gm | ST - used (L) | brown base US Navy - gray coat
| | 1 | 89 | $4.00 | RCA | 110% | 1550/1550Gm | ST - used (L) | brown base US Navy - gray coat
| | 1 | 89 | $4.00 | RCA | 110% | 1700/1550Gm | ST - used (L) | brown base US Navy - gray coat - cat:312-182
| | 1 | 89 | $4.00 | RCA | 110% | 1550/1550Gm | ST - used (L) | brown base US Navy - gray coat
| | 1 | 89 | $4.00 | RCA | 110% | 1550/1550Gm | ST - used (L) | brown base US Navy - gray coat
| | 1 | 89 | $4.00 | RCA | 110% | 1700/1550Gm | ST - used (L) | brown base US Navy - gray coat
| | 1 | NU-89T | $7.00 | National Union | 110% | 1650/1550Gm | ST - used (L) | cat:32-601 (pl)
| | 1 | 89Y | $6.00 | Sylvania | 120% | 1600/1550Gm | ST - used (L) | brown base - gray coat
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Notes:
(OB) = original box, (rb) = relabeled/replacement box, (wb) = white box,
(L) = loose (no box), (pl) = paper label on tube (original or third party)
(H) = tested on Hickok 539A
ST=ST Style, GT=GT Style, 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; Except (H)=tested on Hickok 539A
(Gm = measured/baseline, measured1:measured2/baseline, measured1:measured2/baseline1:baseline2).
How To Order:
Purchasing our preoctal 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
Due to the highly volatile nature of the tube business, all Prices are subject to change without notice.
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