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Type: 56 ( 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
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| 1 | 56S | $25.00 | National Union | 130% | 2200/1450Gm | ST - NOS (ob> | factory installed Goat shield - torn box flaps
| | 1 | 56 | $20.00 | Raytheon | 130% | 1750/1450Gm | ST - NOS (wb) | engraved base - four pillar tube - label missing
| | 1 | 56 | $20.00 | Raytheon | 100% | 1450/1450Gm | ST - used (wb) | engraved base - four pillar tube - label missing
| | 1 | 56 | $8.00 | Raytheon | 130% | 1750/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | Raytheon | 140% | 2250/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | RCA | 115% | 1650/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | RCA | 120% | 1700/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | RCA | 120% | 1600/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | RCA | 120% | 1750/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | RCA | 110% | 1600/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | RCA Radiotron | 140% | 2000/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | RCA Radiotron | 110% | 1700/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.50 | RCA/Cunningham | 110% | 1650/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $8.50 | RCA/Cunningham | 115% | 1700/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $8.50 | RCA/Cunningham | 115% | 1650/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $8.50 | RCA/Cunningham | 120% | 1900/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $8.50 | RCA/Cunningham | 120% | 2000/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $8.50 | RCA/Cunningham | 120% | 1700/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $9.00 | RCA/Cunningham | 110% | 1650/1450Gm | ST - NOS (OB) | sealed in box - test flaps opened
| | 1 | 56 | $8.00 | Tung-Sol | 140% | 2000/1450Gm | ST - NOS (ob> | box flap missing
| | 1 | 56 | $8.00 | Tung-Sol | 120% | 1550/1450Gm | ST - NOS (OB) | ---
| | 1 | 56 | $8.00 | Tung-Sol | 140% | 1900/1450Gm | ST - NOS (OB) | ---
| | 1 | 56 | $8.50 | Zenith | 110% | 1650/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $8.50 | Zenith | 120% | 1700/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $8.00 | National Union | 115% | 1800/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | National Union | 110% | 1850/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | National Union | 120% | 1750/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.50 | National Union | 130% | 1950/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $8.50 | National Union | 110% | 1800/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $8.00 | Admiral | 140% | 1800/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | Sylvania | 120% | 2000/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | Sylvania | 110% | 1500/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | Sylvania | 140% | 1900/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | Sylvania | 120% | 1650/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | Sylvania | 110% | 1550/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | Sylvania | 110% | 1950/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.50 | Sylvania | 125% | 1800/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $8.50 | Triad | 150% | 2350/1450Gm | ST - NOS (wb) | engraved base
| | 1 | 56 | $8.00 | Philco | 120% | 1750/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | Philco | 120% | 1700/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | Philco | 110% | 1600/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $8.00 | Wards Super Airline | 120% | 1700/1450Gm | ST - NOS (wb) | ---
| | 1 | 56 | $5.50 | Sylvania | 120% | 1750/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | Sylvania | 120% | 1750/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | Sylvania | 130% | 1700/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $6.00 | Sylvania | 110% | 1550/1450Gm | ST - used (rb) | engraved base
| | 1 | 56 | $6.00 | Sylvania | 120% | 1750/1450Gm | ST - used (rb) | engraved base
| | 1 | 56 | $6.00 | Sylvania | 120% | 1750/1450Gm | ST - used (rb) | engraved base
| | 1 | 56 | $5.00 | Raytheon | 120% | 1050/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | Raytheon | 110% | 1850/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | Arcturus | 110% | 1650/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | Triad | 120% | 1450/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | Lafayette | 100% | 1450/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | Ken-Rad | 140% | 2000/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | National Union | 115% | 1700/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | National Union | 100% | 1450/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.25 | Tung-Sol | 140% | 2150/1450Gm | ST - used (ob) | damaged box
| | 1 | 56 | $5.50 | RCA/Cunningham | 110% | 1550/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | RCA/Cunningham | 120% | 1800/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | RCA | 110% | 1450/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $5.50 | RCA | 120% | 1800/1450Gm | ST - used (rb) | ---
| | 1 | 56 | $6.00 | Triad | 115% | 1800/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $5.50 | Triad | 120% | 2000/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | National Union | 110% | 1650/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | National Union | 120% | 1000/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | National Union | 115% | 1700/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | National Union | 110% | 2050/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | National Union | 120% | 1850/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $5.50 | National Union | 115% | 1650/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | National Union | 130% | 1850/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | National Union | 110% | 1800/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | National Union | 130% | 1700/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Ceco | 110% | 1650/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $5.50 | Wards Super Airline | 140% | 2200/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Wards Super Airline | 140% | 2050/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Wards Super Airline | 130% | 1800/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.00 | Wards Super Airline | 125% | 1700/1450Gm | ST - used (L) | particles inside
| | 1 | 56 | $5.00 | Wards Super Airline | 140% | 1950/1450Gm | ST - used (L) | engraved base - paint on tube
| | 1 | 56 | $6.00 | Tung-Sol | 140% | 2000/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | Tung-Sol | 140% | 2000/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | Tung-Sol | 140% | 2000/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | Tung-Sol | 110% | 1350/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $5.50 | Tung-Sol | 130% | 1800/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Tung-Sol | 130% | 1900/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Tung-Sol | 140% | 2000/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Tung-Sol | 140% | 2000/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Tung-Sol | 130% | 2000/1450Gm | ST - used (L) | ---
| | 1 | 56 | $6.00 | Sylvania | 115% | 1900/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | Sylvania | 120% | 1800/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $5.50 | Sylvania | 125% | 1850/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Sylvania | 110% | 2000/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.00 | Sylvania | 130% | 1900/1450Gm | ST - used (L) | loose glass bead inside tube
| | 1 | 56 | $5.50 | Sylvania | 130% | 1900/1450Gm | ST - used (L) | (pl)
| | 1 | 56 | $5.50 | Sylvania | 120% | 1750/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Sylvania | 130% | 1800/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Sylvania | 115% | 2000/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Sylvania | 140% | 1900/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Sylvania | 120% | 2000/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Sylvania | 115% | 2000/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Sylvania | 115% | 1700/1450Gm | ST - used (L) | ---
| | 1 | 56 | $6.00 | Ken-Rad | 110% | 2000/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $5.50 | Philco | 115% | 1550/1450Gm | ST - used (L) | ---
| | 1 | 56 | $6.00 | Arcturus | 140% | 2000/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $5.50 | Arcturus | 120% | 2350/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Admiral | 125% | 1700/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Delco | 120% | 1800/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | RCA | 115% | 1650/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | RCA Radiotron | 110% | 1700/1450Gm | ST - used (L) | ---
| | 1 | 56 | $6.50 | RCA Victor | 120% | 1600/1450Gm | ST - used (L) | ---
| | 1 | 56 | $6.00 | RCA/Cunningham | 110% | 1650/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | RCA/Cunningham | 120% | 1750/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | RCA/Cunningham | 120% | 1600/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | RCA/Cunningham | 110% | 1600/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | RCA/Cunningham | 110% | 1900/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | Zenith | 115% | 1900/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | Zenith | 110% | 2000/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | Zenith | 130% | 1700/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | Zenith | 125% | 1950/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $6.00 | Lafayette | 110% | 1950/1450Gm | ST - used (L) | engraved base
| | 1 | 56 | $5.00 | Sparton | 140% | 1950/1450Gm | ST - used (L) | engraved base - rattle inside
| | 1 | 56 | $5.00 | unknown | 130% | 1900/1450Gm | ST - used (L) | ---
| | 1 | 56 | $5.50 | Ken-Rad | 120% | 1650/1450Gm | ST - used (L) | (pl)
| | 1 | 56 | $5.00 | Ken-Rad | 120% | 1650/1450Gm | ST - used (L) | engraved base - cracked base
| | 1 | 56 | $5.00 | Crosley by Ken-Rad | 120% | 1600/1450Gm | ST - used (L) | engraved base - cracked base
| | 1 | 56 | $5.00 | Raytheon | 130% | 1850/1450Gm | ST - used (L) | ---
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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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