MDB Ventures Preoctal Radio Vacuum Tubes
Type: 55 , 56 , 57 , 58 ( NOS and Used )
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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/loktal, miniature, subminature, metal, power, transmitter tubes and many more.
MDB Ventures Preoctal Tubes
Qty
Avail | Tube
Type | Price
Each | Tube
Brand | Emission
Strength | Mutual
Conduct |
Desc |
Notes
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| 1 | 55 | $15.00 | Raytheon | 115% diodes:120% / 120% | 1300 / 975Gm | ST - NOS (wb) | engraved base - four pillar tube - no label |
| 1 | 55 | $9.00 | Tung-Sol | 140% diodes:120% / 120% | 1450 / 975Gm | ST - NOS (OB) | engraved base |
| 1 | 55 | $9.00 | National Union | 140% diodes:120% / 120% | 1500 / 975Gm | ST - NOS (wb) | engraved base |
| 1 | 55 | $9.00 | RCA Radiotron | 120% diodes:120% / 120% | 1400 / 975Gm | ST - NOS (wb) | engraved base |
| 1 | 55 | $8.00 | GE | 125% diodes:110% / 115% | 1400 / 975Gm | ST - NOS (OB) | --- |
| 1 | 55 | $8.00 | GE | 115% diodes:110% / 120% | 1300 / 975Gm | ST - NOS (wb) | --- |
| 1 | 55 | $8.00 | Raytheon | 120% diodes:110% / 110% | 1350 / 975Gm | ST - NOS (OB) | box damaged |
| 1 | 55 | $8.00 | Raytheon | 125% diodes:115% / 115% | 1450 / 975Gm | ST - NOS (OB) | sealed in box - box damaged |
| 1 | 55 | $8.00 | Ken-Rad | 130% diodes:100% / 100% | 1450 / 975Gm | ST - NOS (OB) | box end flap missing |
| 1 | 55 | $8.00 | Philco | 120% diodes:115% / 115% | 1350 / 975Gm | ST - NOS (OB) | --- |
| 1 | 55 | $8.00 | Philco | 120% diodes:110% / 110% | 1450 / 975Gm | ST - NOS (wb) | --- |
| 1 | 55 | $8.00 | RCA | 115% diodes:115% / 115% | 1350 / 975Gm | ST - NOS (OB) | box flap missing |
| 1 | 55 | $8.00 | Sylvania | 120% diodes:110% / 110% | 1350 / 975Gm | ST - NOS (OB) | --- |
| 1 | 55 | $8.00 | Sylvania | 120% diodes:120% / 120% | 1400 / 975Gm | ST - NOS (OB) | --- |
| 1 | 55 | $8.00 | Sylvania | 115% diodes:120% / 120% | 1350 / 975Gm | ST - NOS (OB) | damaged box |
| 1 | 55 | $8.00 | Wards Airline | 130% diodes:110% / 110% | 1300 / 975Gm | ST - NOS (wb) | --- |
| 1 | 55 | $5.00 | Cunningham | 120% diodes:120% / 120% | 1400 / 975Gm | ST - used (rb) | engraved base |
| 1 | 55 | $5.00 | Cunningham | 115% diodes:125% / 125% | 1400 / 975Gm | ST - used (wb) | engraved base |
| 1 | 55 | $5.00 | RCA / Cunningham | 120% diodes:120% / 120% | 1350 / 975Gm | ST - used (wb) | engraved base |
| 1 | 55 | $5.00 | Ken-Rad | 130% diodes:115% / 120% | 1300 / 975Gm | ST - used (rb) | engraved base |
| 1 | 55 | $5.00 | Sylvania | 120% diodes:120% / 110% | 1300 / 975Gm | ST - used (rb) | engraved base - damaged box |
| 1 | 55 | $5.00 | Sylvania | 140% diodes:120% / 120% | 1250 / 975Gm | ST - used (rb) | engraved base - damaged box |
| 1 | 55 | $5.00 | Sylvania | 140% diodes:120% / 115% | 1450 / 975Gm | ST - used (rb) | engraved base - damaged box |
| 1 | 55 | $5.00 | Silvertone | 140% diodes:120% / 120% | 1500 / 975Gm | ST - used (rb) | engraved base - particles inside |
| 1 | 55 | $5.00 | RCA / Cunningham | 100% diodes:120% / 120% | 1150 / 975Gm | ST - used (rb) | engraved base - damaged box |
| 1 | 55 | $5.00 | Fada Radio | 130% diodes:100% / 110% | 1400 / 975Gm | ST - used (L) | engraved base |
| 1 | 55 | $5.00 | Ken-Rad | 110% diodes:120% / 120% | 1350 / 975Gm | ST - used (L) | engraved base |
| 1 | 55 | $5.00 | National Union | 105% diodes:110% / 90% | 1200 / 975Gm | ST - used (L) | engraved base |
| 1 | 55 | $5.00 | Super Airline | 125% diodes:110% / 110% | 1250 / 975Gm | ST - used (L) | engraved base |
| 1 | 55 | $4.00 | Ken-Rad | 110% diodes:120% / 120% | 1000 / 975Gm | ST - used (L) | --- |
| 1 | 55 | $4.00 | Ken-Rad | 120% diodes:120% / 120% | 1250 / 975Gm | ST - used (L) | --- |
| 1 | 55 | $4.00 | Sylvania | 140% diodes:110% / 110% | 1550 / 975Gm | ST - used (L) | --- |
| 1 | 55 | $4.00 | unknown | 120% diodes:120% / 120% | 1300 / 975Gm | ST - used (L) | --- |
| 1 | 55 | $3.00 | Sylvania | 90% diodes:100% / 100% | 900 / 950Gm | ST - used (wb) | engraved base |
| 1 | 55 | $2.50 | National Union | 90% diodes:110% / 110% | 1100 / 975Gm | ST - used (ob) | damaged box |
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| 1 | 56 | $5.00 | Sylvania | 100% | 1450 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | Sylvania | 105% | 1650 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | Sylvania | 105% | 1650 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | Sylvania | 100% | 1400 / 1450Gm | ST - used (L) | cat:321-119 |
| 1 | 56 | $5.00 | RCA Radiotron | 100% | 1300 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | RCA Radiotron | 100% | 1450 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | RCA Radiotron | 100% | 1450 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | RCA Radiotron | 100% | 1450 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | RCA Victor | 100% | 1500 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | RCA | 100% | 1450 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | Wards Super Airline | 100% | 1600 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | GE | 100% | 1300 / 1450Gm | ST - used (L) | paint on tube |
| 1 | 56 | $5.00 | Zenith | 100% | 1800 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | Tung-Sol | 100% | 1400 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | National Union | 100% | 1500 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $5.00 | National Union | 105% | 1750 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $4.00 | National Union | 90% | 1450 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $4.00 | National Union | 95% | 1450 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $4.00 | National Union | 90% | 1500 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $4.00 | Silvertone | 90% | 1500 / 1450Gm | ST - used (L) | (pl) engraved base |
| 1 | 56 | $4.00 | Philco | 90% | 1100 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $4.00 | Sylvania | 95% | 1450 / 1450Gm | ST - used (L) | engraved base |
| 1 | 56 | $4.00 | Sylvania | 90% | 1250 / 1450Gm | ST - used (L) | engraved base |
| 1 | 56 | $4.00 | Sylvania | 90% | 1550 / 1450Gm | ST - used (L) | engraved base |
| 1 | 56 | $4.00 | RCA Victor | 95% | 1450 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $4.00 | RCA / Cunninghma | 90% | 1300 / 1450Gm | ST - used (L) | engraved base |
| 1 | 56 | $4.00 | Zenith | 90% | 1300 / 1450Gm | ST - used (L) | engraved base |
| 1 | 56 | $4.00 | Super Airline | 90% | 1400 / 1450Gm | ST - used (L) | engraved base |
| 1 | 56 | $4.00 | Arcturus | 90% | 1350 / 1450Gm | ST - used (L) | engraved base |
| 1 | 56 | $3.00 | National Union | 85% | 1350 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $3.00 | National Union | 85% | 1100 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $3.50 | Silvertone | 85% | 1250 / 1450Gm | ST - used (L) | (pl) |
| 1 | 56 | $3.00 | RCA Victor | 85% | 1200 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $3.00 | Crosley by Ken-Rad | 85% | 1300 / 1450Gm | ST - used (L) | engraved base - cracked base |
| 1 | 56 | $3.00 | Triad | 85% | 1200 / 1450Gm | ST - used (L) | engraved base |
| 1 | 56 | $2.00 | RCA Victor | 80% | 1300 / 1450Gm | ST - used (L) | --- |
| 1 | 56 | $2.00 | RCA / Cunninghma | 80% | 1450 / 1450Gm | ST - used (L) | engraved base |
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| 1 | NU-57 | $7.50 | National Union | 130% | 1300 / 1225Gm | ST - used (L) | engraved base |
| 1 | NU-57 | $7.50 | National Union | 115% | 1300 / 1225Gm | ST - used (L) | engraved base |
| 1 | NU-57 | $7.50 | National Union | 120% | 1200 / 1225Gm | ST - used (L) | engraved base |
| 1 | NU-57 | $7.50 | National Union | 110% | 1200 / 1225Gm | ST - used (L) | engraved base |
| 1 | NU-57 | $7.50 | National Union | 120% | 1300 / 1225Gm | ST - used (L) | engraved base |
| 1 | NU-57 | $7.50 | National Union | 120% | 1300 / 1225Gm | ST - used (L) | engraved base |
| 1 | G-57-S | $6.00 | Majestic | 120% | 1300 / 1225Gm | ST - used (L) | engraved base - paint shield |
| 1 | G-57-S | $6.00 | Majestic | 150% | 1900 / 1225Gm | ST - used (L) | engraved base - paint shield |
| 1 | G-57-S | $6.00 | Majestic | 150% | 1700 / 1225Gm | ST - used (L) | engraved base - paint shield |
| 1 | G-57-S | $6.00 | Majestic | 140% | 1550 / 1225Gm | ST - used (L) | engraved base - paint shield |
| 1 | 57 | $5.00 | National Union | 105% | 1000 / 1225Gm | ST - used (L) | --- |
| 1 | 57 | $5.00 | Sylvania | 100% | 950 / 1225Gm | ST - used (L) | --- |
| 1 | 57 | $5.00 | Triad | 100% | 900 / 1225Gm | ST - used (L) | engraved base |
| 1 | 57 | $5.00 | Tung-Sol | 100% | 1500 / 1225Gm | ST - used (L) | cat:312-250 |
| 1 | 57 | $5.00 | Philco | 100% | 1400 / 1225Gm | ST - used (L) | engraved base cat:312-249 |
| 1 | 57 | $4.00 | National Union | 90% | 900 / 1225Gm | ST - used (L) | engraved base |
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| 1 | 58-S | $15.00 | Sylvania | 110% | 2000 / 1600Gm | ST - used (L) | factory metal shield - minor surface rust |
| 1 | NU-58 | $4.00 | National Union | 95% | 1650 / 1600Gm | ST - used (L) | engraved base |
| 1 | G-58-S | $4.00 | Majestic | 95% | 1600 / 1600Gm | ST - used (L) | engraved base - paint shield |
| 1 | 58 | $3.00 | Jackson Bell | 90% | 1600 / 1600Gm | ST - used (L) | engraved base |
| 1 | 58 | $3.00 | National Union | 90% | 1100 / 1600Gm | ST - used (L) | cat:312-221 |
| 1 | 58 | $3.00 | National Union | 95% | 1150 / 1600Gm | ST - used (L) | --- |
| 1 | 58 | $3.00 | National Union | 95% | 1600 / 1600Gm | ST - used (L) | --- |
| 1 | 58 | $3.00 | RCA / Cunningham | 95% | 1500 / 1600Gm | ST - used (L) | engraved base |
| 1 | 58 | $3.00 | RCA Radiotron | 90% | 1700 / 1600Gm | ST - used (L) | --- |
| 1 | 58 | $3.00 | Tung-Sol | 95% | 1400 / 1600Gm | ST - used (L) | engraved base |
| 1 | 58 | $3.00 | Sylvania | 90% | 1400 / 1600Gm | ST - used (L) | engraved base |
| 1 | 58 | $3.00 | Sylvania | 90% | 1500 / 1600Gm | ST - used (L) | engraved base |
| 1 | 58 | $3.00 | Crosley by Ken-Rad | 95% | 1600 / 1600Gm | ST - used (L) | engraved base - cracked base |
| 1 | 58 | $3.00 | Ken-Rad | 90% | 1600 / 1600Gm | ST - used (L) | engraved base |
| 1 | 58 | $3.00 | Wizard | 90% | 1650 / 1600Gm | ST - used (L) | --- |
| 1 | 58 | $3.00 | Silvertone | 90% | 1700 / 1600Gm | ST - used (L) | engraved base |
| 1 | 58 | $3.00 | Delco | 90% | 1400 / 1600Gm | ST - used (L) | --- |
| 1 | 58 | $2.50 | Crosley by Ken-Rad | 85% | 1150 / 1600Gm | ST - used (L) | engraved base |
| 1 | 58 | $2.00 | Tung-Sol | 85% | 1300 / 1600Gm | ST - used (L) | --- |
| 1 | 58 | $2.00 | Tung-Sol | 85% | 1300 / 1600Gm | ST - used (L) | --- |
| 1 | 58 | $2.00 | National Union | 85% | 1100 / 1600Gm | ST - used (L) | --- |
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.
Shipping and Handling Information
Contact MDB Ventures
sales@mdbventures.com
or
sales@fourwater.com
Due to the highly volatile nature of the tube business, all Prices are subject to change without notice.
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