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 84 / 6Z4-GT $7.50 Sylvania 110% / 110% --- GT - NOS (ob) ---
1 84 / 6Z4-GT $7.50 Sylvania 110% / 110% --- GT - NOS (ob) ---
1 84 / 6Z4-GT $7.50 Sylvania 110% / 110% --- GT - NOS (ob) ---
1 84 / 6Z4-GT $7.50 Sylvania 110% / 115% --- GT - NOS (ob) ---
1 84 / 6Z4-GT $7.50 Sylvania 100% / 100% --- GT - NOS (ob) ---
1 84 / 6Z4-GT $7.50 RCA 110% / 110% --- GT - NOS (ob) ---
1 84 / 6Z4-GT $7.50 Radiocoin 100% / 110% --- GT - NOS (ob) damaged box
1 84 / 6Z4-GT $7.50 GE 105% / 110% --- GT - NOS (wb) ---
1 84 / 6Z4-GT $5.00 GE 105% / 105% --- GT - used (rb) ---
1 84 / 6Z4 $7.50 RCA 110% / 110% --- TT - NOS (ob) damaged box
1 84 / 6Z4 $7.50 Raytheon 110% / 110% --- TT - NOS (ob) ---
1 84 / 6Z4 $7.50 GE 100% / 100% --- TT - NOS (ob) ---
1 84 / 6Z4 $5.00 RCA 100% / 100% --- TT - used (rb) ---
1 84 / 6Z4 $25.00 Raytheon 120% / 120% --- ST - NOS (wb) engraved base - four pillar tube (pl)
1 84 / 6Z4 $24.00 Raytheon 110% / 110% --- ST - NOS (wb) engraved base - four pillar tube - no label
1 84 / 6Z4 $15.00 Raytheon 105% / 110% --- ST - used (wb) engraved base - four pillar tube (pl)
1 84 / 6Z4 $15.00 Raytheon 100% / 110% --- ST - used (wb) engraved base - four pillar tube - torn label
1 84 / 6Z4 $15.00 Raytheon 115% / 110% --- ST - used (wb) engraved base - four pillar tube - no label
1 84 / 6Z4 $15.00 Raytheon 100% / 100% --- ST - used (wb) engraved base - four pillar tube - torn label
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 100% --- ST - NOS (ob) JAN - cat:312-354
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 100% --- ST - NOS (ob) JAN - cat:312-352
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 110% --- ST - NOS (ob) JAN
1 84 / 6Z4 / VT-84 $10.00 Sylvania 110% / 110% --- ST - NOS (ob) JAN - sealed in box
1 84 / 6Z4 / VT-84 $10.00 Sylvania 105% / 110% --- ST - NOS (ob) JAN - cat:312-353
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 100% --- ST - NOS (ob) JAN - cat:401-502
1 84 / 6Z4 / VT-84 $10.00 Sylvania 110% / 110% --- ST - NOS (ob) JAN - cat:401-81
1 84 / 6Z4 / VT-84 $10.00 Sylvania 115% / 115% --- ST - NOS (ob) US Navy
1 84 / 6Z4 / VT-84 $10.00 Sylvania 110% / 110% --- ST - NOS (ob) JAN
1 84 / 6Z4 / VT-84 $10.00 Sylvania 115% / 115% --- ST - NOS (ob) JAN
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 100% --- ST - NOS (ob) JAN - cat:312-351
1 84 / 6Z4 / VT-84 $10.00 Sylvania 105% / 105% --- ST - NOS (ob) JAN - cat:312-375
1 84 / 6Z4 / VT-84 $10.00 Sylvania 110% / 125% --- ST - NOS (ob) JAN
1 84 / 6Z4 / VT-84 $10.00 Sylvania 110% / 110% --- ST - NOS (wb) US Navy
1 84 / 6Z4 / VT-84 $10.00 Sylvania 105% / 105% --- ST - NOS (wb) JAN
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 100% --- ST - NOS (wb) JAN
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 100% --- ST - NOS (wb) JAN
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 100% --- ST - NOS (wb) JAN
1 84 / 6Z4 / VT-84 $10.00 Sylvania 105% / 105% --- ST - NOS (wb) JAN
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 100% --- ST - NOS JAN - sealed in original wrapper - cat:312-336
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 100% --- ST - NOS JAN - sealed in original wrapper - cat:312-339
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 100% --- ST - NOS JAN - sealed in original wrapper - cat:312-338
1 84 / 6Z4 / VT-84 $10.00 Sylvania 100% / 100% --- ST - NOS JAN - sealed in original wrapper - cat:312-340
1 84 / 6Z4 / VT-84 $10.00 RCA 110% / 110% --- ST - NOS (ob) JAN
1 84 / 6Z4 / VT-84 $10.00 Ken-Rad 110% / 110% --- ST - NOS (ob) US Army - damaged box
1 84 / 6Z4 / VT-84 $10.00 Ken-Rad 115% / 115% --- ST - NOS (ob) damaged box
1 84 / 6Z4 / VT-84 $10.00 Ken-Rad 120% / 120% --- ST - NOS (ob) US Army - sealed in box
1 84 / 6Z4 $10.00 RCA / Cunningham 115% / 115% --- ST - NOS (wb) engraved base
1 84 / 6Z4 $10.00 Philco 110% / 110% --- ST - NOS (wb) engraved base
1 84 / 6Z4 $10.00 Philco 110% / 115% --- ST - NOS (wb) engraved base
1 84 / 6Z4 $10.00 Philco 110% / 115% --- ST - NOS (wb) engraved base
1 84 / 6Z4 $10.00 Philco 110% / 115% --- ST - NOS (wb) engraved base
1 84 / 6Z4 $10.00 Philco 100% / 105% --- ST - NOS (wb) engraved base
1 84 / 6Z4 $10.00 Philco 100% / 100% --- ST - NOS (wb) engraved base
1 84 / 6Z4 $8.00 Crosley by RCA 110% / 120% --- ST - NOS (ob) ---
1 84 / 6Z4 $8.00 Emerson 120% / 120% --- ST - NOS (ob) damaged box
1 84 / 6Z4 $8.00 Sylvania 100% / 100% --- ST - NOS (ob) ---
1 84 / 6Z4 $8.00 Sylvania 110% / 110% --- ST - NOS (ob) ---
1 84 / 6Z4 $8.00 Sylvania 110% / 110% --- ST - NOS (ob) ---
1 84 / 6Z4 $8.00 Hytron untested heater ok ST - NOS (ob) sealed in box
1 84 / 6Z4 $8.00 Hytron untested heater ok ST - NOS (ob) sealed in box
1 84 / 6Z4 $8.00 RCA Victor 120% / 120% --- ST - NOS (ob) ---
1 84 / 6Z4 $8.00 RCA 110% / 110% --- ST - NOS (wb) ---
1 84 / 6Z4 $8.00 RCA 120% / 120% --- ST - NOS (wb) ---
1 84 / 6Z4 $8.00 RCA 120% / 115% --- ST - NOS (ob) ---
1 84 / 6Z4 $8.00 RCA 115% / 120% --- ST - NOS (ob) ---
1 84 / 6Z4 $8.00 RCA 100% / 100% --- ST - NOS (ob) US Navy
1 84 / 6Z4 $8.00 RCA 110% / 110% --- ST - NOS (ob) damaged box - cat:312-337
1 84 / 6Z4 $8.00 RCA / Cunningham 110% / 110% --- ST - NOS (wb) engraved base
1 84 / 6Z4 $8.00 Philco 100% / 100% --- ST - NOS (ob) sealed in box - damaged box
1 84 / 6Z4* $8.00 Philco 110% / 110% --- ST - NOS (ob) damaged box
1 84 / 6Z4 $8.00 Philco 100% / 105% --- ST - NOS (ob) damaged box
1 84 / 6Z4 $8.00 Philco 100% / 100% --- ST - NOS (ob) sealed in box - damaged box
1 84 / 6Z4 $8.00 Tung-Sol 110% / 110% --- ST - NOS (ob) ---
1 84 / 6Z4 $8.00 National Union 100% / 100% --- ST - NOS (ob) ---
1 84 / 6Z4 $8.00 National Union 110% / 110% --- ST - NOS (ob) ---
1 84 / 6Z4 $8.00 Tung-Sol 105% / 110% --- ST - NOS (wb) ---
1 84 / 6Z4 $10.00 Silvertone 110% / 110% --- ST - used (wb) engraved base - early cylinder plate
1 84 / 6Z4 $5.00 RCA 110% / 115% --- ST - used (rb) ---
1 84 / 6Z4 $5.00 RCA 110% / 110% --- ST - used (rb) ---
1 84 / 6Z4 $5.00 RCA 110% / 120% --- ST - used (rb) JAN
1 84 / 6Z4 $5.00 Tung-Sol 105% / 110% --- ST - used (wb) engraved base
1 84 / 6Z4 $5.00 Sylvania 110% / 110% --- ST - used (rb) engraved base
1 84 / 6Z4 $5.00 Philco 110% / 110% --- ST - used (rb) engraved base
1 84 / 6Z4 $5.00 Philco 110% / 110% --- ST - used (rb) ---
1 84 / 6Z4 $5.00 Triad 110% / 110% --- ST - used (rb) ---
1 84 / 6Z4 / VT-84 $5.00 Sylvania 100% / 110% --- ST - used (ob) JAN
1 84 / 6Z4 $4.00 National Union 90% / 95% --- ST - used (rb) ---

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