MDB Ventures Preoctal Radio Vacuum Tubes


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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
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
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
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
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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Contact MDB Ventures
sales@mdbventures.com
or
sales@fourwater.com