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