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 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (wb) | --- |
| 1 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (wb) | JAN - cat:401-160 |
| 1 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (ob) | --- |
| 1 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (ob) | --- |
| 1 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (ob) | --- |
| 1 | 25Z5GT | $5.00 | RCA | 110% / 110% | --- | ST - NOS (ob) | --- |
| 1 | 25Z5GT | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5GT | $5.00 | Raytheon | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5GT | $5.00 | Raytheon | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5GT | $5.00 | GE | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5GT | $5.00 | GE | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5GT | $5.00 | GE | 110% / 110% | --- | ST - NOS (OB) | torn box flap |
| 1 | 25Z5GT | $5.00 | Tung-Sol | 110% / 110% | --- | ST - NOS (OB) | cat:312-359 |
| 1 | 25Z5GT | $5.00 | Tung-Sol | 110% / 110% | --- | ST - NOS (wb) | cat:312-361 |
| 1 | 25Z5GT | $3.00 | GE | 110% / 110% | --- | ST - used (ob) | damaged box |
| 1 | 25Z5GT | $3.00 | GE | 110% / 110% | --- | ST - used (ob) | --- |
| 1 | 25Z5GT | $3.00 | CBS / Hytron | 110% / 110% | --- | ST - used (L) | --- (P16) |
| 1 | 25Z5GT | $3.00 | Raytheon | 110% / 110% | --- | ST - used (L) | --- (P16) |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | damaged box |
| 1 | 25Z5 | $5.00 | Wards Airline | 110% / 110% | --- | ST - NOS (OB) | damaged box |
| 1 | 25Z5 | $5.00 | Delco | 110% / 110% | --- | ST - NOS (OB) | damaged box |
| 1 | 25Z5 | $5.00 | Raytheon | 110% / 110% | --- | ST - NOS (OB) | damaged box |
| 1 | 25Z5 | $5.00 | Hytron | untested | --- | ST - NOS (OB) | JAN - sealed in box - cat:312-333 |
| 1 | 25Z5 | $5.00 | National Union | 110% / 110% | --- | ST - NOS (OB) | JAN |
| 1 | 25Z5 | $5.00 | National Union | 110% / 110% | --- | ST - NOS (OB) | JAN |
| 1 | 25Z5 | $5.00 | National Union | 110% / 110% | --- | ST - NOS (wb) | cat:402-295 |
| 1 | 25Z5 | $5.00 | National Union | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | National Union | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | National Union | 110% / 110% | --- | ST - NOS (OB) | sealed in box |
| 1 | 25Z5 | $5.00 | National Union | 110% / 115% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | National Union | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | National Union | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | CBS / Hytron | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | CBS / Hytron | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | CBS / Hytron | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | CBS / Hytron | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | GE | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Tung-Sol | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Tung-Sol | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Tung-Sol | 110% / 110% | --- | ST - NOS (OB) | cat:312-360 |
| 1 | 25Z5 | $5.00 | RCA | 110% / 110% | --- | ST - NOS (wb) | --- |
| 1 | 25Z5 | $5.00 | RCA | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | RCA | 110% / 110% | --- | ST - NOS (OB) | cat:401-481 |
| 1 | 25Z5 | $5.00 | RCA | 110% / 110% | --- | ST - NOS (OB) | cat:312-362 |
| 1 | 25Z5 | $5.00 | RCA | 110% / 110% | --- | ST - NOS (OB) | --- |
| 1 | 25Z5 | $5.00 | Cunningham | 110% / 110% | --- | ST - NOS (OB) | damaged box |
| 1 | 25Z5 | $5.00 | Ken-Rad | 110% / 110% | --- | ST - NOS (OB) | water damaged box - cat:401-477 |
| 1 | 25Z5 | $5.00 | Ken-Rad | 110% / 110% | --- | ST - NOS (OB) | water damaged box - cat:401-476 |
| 1 | 25Z5 | $5.00 | Ken-Rad | 110% / 110% | --- | ST - NOS (OB) | water damaged box - cat:401-474 |
| 1 | 25Z5 | $5.00 | Ken-Rad | 110% / 110% | --- | ST - NOS (OB) | damaged box - cat:401-482 |
| 1 | 25Z5 | $5.00 | Ken-Rad | 110% / 110% | --- | ST - NOS (OB) | cat:401-490 |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | JAN - cat:401-496 |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | JAN - cat:401-500 |
| 1 | 25Z5 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | JAN - cat:401-501 |
| 1 | 25Z5 / 38255 | $5.00 | Sylvania | 110% / 110% | --- | ST - NOS (OB) | US Navy - cat:401-91 - damaged box |
| 1 | 25Z5 | $5.00 | Silvertone | 110% / 110% | --- | ST - NOS (OB) | cat:401-485 |
| 1 | 25Z5 | $3.00 | Ken-Rad | 100% / 100% | --- | ST - used (ob) | --- |
| 1 | 25Z5 | $3.00 | CBS / Hytron | 100% / 100% | --- | ST - used (ob) | engraved base - damaged box - cat:312-60 |
| 1 | 25Z5 | $3.00 | Sylvania | 110% / 110% | --- | ST - used (rb) | --- |
| 1 | 25Z5 | $3.00 | Sylvania | 110% / 110% | --- | ST - used (rb) | damaged box |
| 1 | 25Z5 | $3.00 | GE | 100% / 95% | --- | ST - used (rb) | --- |
| 1 | 25Z5 | $3.00 | GE | 100% / 95% | --- | ST - used (rb) | --- |
| 1 | 25Z5 | $3.00 | Tung-Sol | 110% / 110% | --- | ST - used (ob) | --- |
| 1 | 25Z5 | $3.00 | Sylvania | 110% / 110% | --- | ST - used (rb) | cat:401-484 |
| 1 | 25Z5 | $3.00 | National Union | 110% / 110% | --- | ST - used (L) | --- (P16) |
| 1 | 25Z5 | $3.00 | National Union | 100% / 105% | --- | ST - used (L) | JAN (P16) |
| 1 | 25Z5 | $3.00 | National Union | 105% / 100% | --- | ST - used (L) | --- (P16) |
| 1 | 25Z5 | $3.00 | National Union | 100% / 100% | --- | ST - used (L) | --- (P16) |
| 1 | 25Z5 | $3.00 | National Union | 100% / 100% | --- | ST - used (L) | paint on tube (P16) |
| 1 | 25Z5 | $3.00 | National Union | 110% / 110% | --- | ST - used (L) | --- |
| 1 | 25Z5 | $3.00 | National Union | 105% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | National Union | 110% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | National Union | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | National Union | 110% / 105% | --- | ST - used (L) | engraved base (P16) |
| 1 | 25Z5 | $3.00 | National Union | 105% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | National Union | 110% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | National Union | 100% / 100% | --- | used (L) | cat:401-131 (P16) |
| 1 | 25Z5 | $3.00 | RCA | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 100% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 100% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 110% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 110% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 105% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 110% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 110% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA | 110% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | RCA Victor | 105% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Tung-Sol | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Tung-Sol | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Tung-Sol | 110% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Tung-Sol | 100% / 100% | --- | ST - used (L) | cat:402-122 (P16) |
| 1 | 25Z5 | $3.00 | Tung-Sol | 105% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Tung-Sol | 105% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Tung-Sol | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Sylvania | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Sylvania | 110% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Sylvania | 110% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Sylvania | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Sylvania | 110% / 100% | --- | ST - used (L) | engraved base (P16) |
| 1 | 25Z5 | $3.00 | Sylvania | 110% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Sylvania | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Sylvania | 110% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Philco | 105% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Philco | 110% / 110% | --- | ST - used (L) | engraved base (P16) |
| 1 | 25Z5 | $3.00 | Philco | 110% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Philco | 110% / 110% | --- | ST - used (L) | cat:312-12 (P16) |
| 1 | 25Z5 | $3.00 | Philco | 110% / 110% | --- | ST - used (L) | engraved base (P16) |
| 1 | 25Z5 | $3.00 | Philco | 110% / 110% | --- | ST - used (L) | engraved base (P16) |
| 1 | 25Z5 | $3.00 | Arcturus | 110% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Arcturus | 100% / 100% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Arcturus | 110% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Arcturus | 105% / 105% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Arcturus | 100% / 110% | --- | ST - used (L) | -- (P16) |
| 1 | 25Z5 | $3.00 | Westinghouse | 110% / 110% | --- | ST - used (L) | cat:321-132 (P16) |
| 1 | 25Z5 | $3.00 | Cunningham | 110% / 110% | --- | ST - used (L) | cat:312-186 (P16) |
| 1 | 25Z5 | $3.00 | Cunningham | 105% / 110% | --- | ST - used (L) | engraved base (P16) |
| 1 | 25Z5 | $3.00 | GE | 100% / 100% | --- | ST - used (L) | --- (P16) |
| 1 | 25Z5 | $3.00 | Emerson | 100% / 105% | --- | ST - used (L) | --- (P16) |
| 1 | 25Z5 | $3.00 | Kadette | 105% / 105% | --- | ST - used (L) | --- (P16) |
| 1 | 25Z5 | $3.00 | Ken-Rad | 110% / 110% | --- | ST - used (L) | --- (P16) |
| 1 | 25Z5 | $3.00 | Unkown | 110% / 110% | --- | ST - used (L) | --- (P16) |
| 1 | 25Z5 | $3.00 | Sylvania | 105% / 110% | --- | ST - used (L) | --- (P16) |
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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