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 | 84 / 6Z4 | $5.00 | Tung-Sol | 110% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $5.00 | National Union | 110% / 115% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $5.00 | RCA / Cunningham | 110% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $5.00 | Philco | 110% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $5.00 | Philco | 110% / 110% | --- | ST - used (L) | engraved base - cat:312-194 |
| 1 | 84 / 6Z4 | $5.00 | Philco | 110% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $5.00 | Philco | 110% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $5.00 | Philco | 115% / 120% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $5.00 | Philco | 110% / 110% | --- | ST - used (L) | engraved base - cat:321-98 |
| 1 | 84 / 6Z4 | $5.00 | GE | 115% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $5.00 | Delco | 110% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $5.00 | Sylvania | 110% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $5.00 | Air Castle | 110% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $5.00 | unknown | 110% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $5.00 | Ken-Rad | 110% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $5.00 | Arcturus | 110% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $5.00 | Tung-Sol | 110% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $5.00 | Tung-Sol | 110% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $5.00 | Sylvania | 110% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 105% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 105% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 105% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 105% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 105% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 105% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 105% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 105% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 105% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 105% | --- | ST - used (L) | cat:312-185 |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 105% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 100% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 100% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Philco | 100% / 100% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Philco | 105% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | RCA | 105% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | RCA | 105% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | RCA | 105% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | RCA | 100% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | RCA | 100% / 105% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | RCA | 100% / 110% | --- | ST - used (L) | US Navy |
| 1 | 84 / 6Z4 | $4.00 | RCA Victor | 100% / 100% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | RCA Victor | 100% / 100% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Sylvania | 100% / 105% | --- | ST - used (L) | US Navy |
| 1 | 84 / 6Z4 | $4.00 | Sylvania | 100% / 100% | --- | ST - used (L) | US Navy |
| 1 | 84 / 6Z4 | $4.00 | Sylvania | 100% / 100% | --- | ST - used (L) | US Navy |
| 1 | 84 / 6Z4 | $4.00 | Sylvania | 105% / 105% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Sylvania | 100% / 100% | --- | used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Sylvania | 110% / 100% | --- | used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Sylvania | 110% / 105% | --- | used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Ken-Rad | 105% / 105% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Ken-Rad | 100% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Ken-Rad | 100% / 105% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Ken-Rad | 100% / 100% | --- | ST - used (L) | engraved base - cat:321-118 |
| 1 | 84 / 6Z4 | $4.00 | Ken-Rad | 100% / 100% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Ken-Rad | 100% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Ken-Rad | 100% / 110% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 / VT-84 | $4.00 | Sylvania | 100% / 105% | --- | ST - used (L) | JAN |
| 1 | 84 / 6Z4 / VT-84 | $4.00 | Sylvania | 100% / 100% | --- | ST - used (L) | JAN |
| 1 | 84 / 6Z4 | $4.00 | National Union | 105% / 105% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $4.00 | Tung-Sol | 105% / 105% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Triad | 100% / 105% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Zenith | 100% / 100% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $4.00 | Hytron | 105% / 110% | --- | ST - used (L) | cat:312-201 |
| 1 | 84 / 6Z4 | $4.00 | Raytheon | 100% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $3.00 | Philco | 90% / 90% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $3.00 | Philco | 90% / 90% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $3.00 | Philco | 90% / 90% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $3.00 | Philco | 95% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $3.00 | Philco | 90% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $3.00 | Sylvania | 90% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $3.00 | Sylvania | 95% / 100% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $3.00 | CBS | 95% / 90% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $3.00 | Zenith | 95% / 100% | --- | ST - used (L) | cat:401-452 |
| 1 | 84 / 6Z4 | $3.00 | RCA | 95% / 105% | --- | ST - used (L) | cat:312-320 |
| 1 | 84 / 6Z4 | $3.00 | RCA | 95% / 100% | --- | ST - used (L) | US Navy - cat:312-210 |
| 1 | 84 / 6Z4 | $3.00 | RCA / Cunningham | 90% / 110% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $3.00 | National Union | 90% / 95% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $3.00 | Ken-Rad | 90% / 100% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $2.00 | unknown | 90% / 95% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 / VT-64 | $3.00 | RCA | 110% / 95% | --- | ST - used (L) | JAN - cat:312-328 |
| 1 | 84 / 6Z4 | $2.50 | Philco | 80% / 85% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $2.50 | Philco | 80% / 90% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $2.50 | RCA / Cunningham | 85% / 85% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4 | $2.50 | Admiral | 80% / 80% | --- | ST - used (L) | --- |
| 1 | 84 / 6Z4 | $2.50 | Ken-Rad | 85% / 90% | --- | ST - used (L) | engraved base |
| 1 | 84 / 6Z4-GT | $2.50 | Philco | 100% / 105% | --- | GT - used (L) | --- |
| 1 | 84 / 6Z4-GT | $2.50 | RCA | 110% / 115% | --- | GT - used (L) | --- |
| 1 | 84 / 6Z4-GT | $2.50 | Raytheon | 100% / 100% | --- | GT - used (L) | cat:312-212 |
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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