Welcome to MDB Ventures
Audio Tube Store
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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, miniature, subminiature, metal, power, transmitter tubes and many more.
MDB Ventures Audio Tubes
Qty
Avail | Tube
Type | Price
Each | Tube
Brand | Emission
Strength | Mutual
Conduct |
Desc |
Notes
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| 1 | 5W4 | $5.00 | Raytheon | 130% / 130% | --- | NOS (OB) | metal tube |
| 1 | 5W4 | $5.00 | Hytron | 120% / 120% | --- | NOS (OB) | metal tube - torn box flap |
| 1 | 5W4 | $5.00 | Hytron | 125% / 125% | --- | NOS (OB) | mettal tube |
| 1 | 5W4 | $5.00 | Ken-Rad | 120% / 120% | --- | NOS (OB) | metal tube |
| 1 | 5W4 | $5.00 | Sylvania | 120% / 120% | --- | NOS (wb) | metal tube - green lettering |
| 1 | 5W4 | $5.00 | Sylvania | 120% / 120% | --- | NOS (OB) | sealed in box - metal tube |
| 1 | 5W4 | $5.00 | Sylvania | 130% / 130% | --- | NOS (OB) | metal tube - green lettering |
| 1 | 5W4GT | $5.00 | RCA | 115% / 115% | --- | NOS (wb) | silver lettering |
| 1 | 5W4GT | $5.00 | RCA | 115% / 115% | --- | NOS (wb) | --- |
| 1 | 5W4GT | $5.00 | RCA | 110% / 110% | --- | NOS (OB) | --- |
| 1 | 5W4GT | $5.00 | Raytheon | 120% / 120% | --- | NOS (OB) | --- |
| 1 | 5W4GT | $5.00 | Raytheon | 120% / 125% | --- | NOS (OB) | --- |
| 1 | 5W4GT | $5.00 | Hytron | 120% / 120% | --- | NOS (OB) | worn box |
| 1 | 5W4GT | $5.00 | GE | 120% / 120% | --- | NOS (OB) | white lettering |
| 1 | 5W4GT | $5.00 | GE | 120% / 120% | --- | NOS (OB) | white lettering |
| 1 | 5W4GT | $5.00 | National Union | 110% / 110% | --- | NOS (OB) | --- |
| 1 | 5W4-GT | $2.00 | RCA | 110% / 110% | --- | used (rb) | --- |
| 1 | 5W4-GT | $2.00 | Raytheon | 100% / 110% | --- | used (rb) | --- |
| 1 | 5W4 | $2.00 | Raytheon | 100% / 105% | --- | used (rb) | metal tube |
| 1 | 5W4 | $2.00 | RCA | 100% / 100% | --- | used (rb) | metal |
| 1 | 5W4 | $2.00 | RCA Victor | 100% / 100% | --- | used (L) | metal |
| 1 | 5W4 | $2.00 | RCA Victor | 100% / 100% | --- | used (L) | metal |
| 1 | 5W4 | $2.00 | National Union | 100% / 100% | --- | used (L) | metal |
| 1 | 5W4 | $2.00 | National Union | 100% / 100% | --- | used (L) | metal |
| 1 | 5W4 | $1.50 | RCA | 95% / 95% | --- | used (L) | metal |
| 1 | 5W4 | $1.50 | Raytheon | 95% / 95% | --- | used (L) | metal |
| 1 | 5W4 | $1.50 | GE | 95% / 95% | --- | used (L) | metal |
| 1 | 5W4 | $1.50 | RCA | 100% / 90% | --- | used (rb) | metal |
| 1 | 5W4 | $1.50 | RCA | 90% / 90% | --- | used (L) | metal |
| 1 | 5W4 | $1.50 | RCA | 90% / 90% | --- | used (L) | metal |
| 1 | 5W4 | $1.50 | Tung-Sol | 90% / 90% | --- | used (L) | metal |
| 1 | 5W4-GT | $1.50 | Ken-Rad | 115% / 115% | --- | used (rb) | JAN - loose base |
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| 1 | 5Y3GT | $15.00 | GE | 110% / 110% | --- | NOS (OB) | white lettering |
| 1 | 5Y3GT | $15.00 | Sylvania | 115% / 115% | --- | NOS (OB) | yellow lettering |
| 1 | 5Y3GT | $14.00 | Sylvania | 115% / 115% | --- | NOS (wb) | yellow lettering |
| 1 | 5Y3GT | $14.00 | Sylvania | 120% / 120% | --- | NOS (wb) | red lettering |
| 1 | 5Y3GT | $14.00 | Sylvania | 120% / 120% | --- | NOS (wb) | green lettering |
| 1 | 5Y3GT / VT-197A | $9.00 | Sylvania | 110% / 110% | --- | used (L) | JAN - white lettering |
| 1 | 5Y3GT / VT-197A | $9.00 | Sylvania | 110% / 120% | --- | used (L) | JAN - white lettering |
| 1 | 5Y3GT / VT-197A | $9.00 | Sylvania | 115% / 110% | --- | used (L) | JAN - white lettering |
| 1 | 5Y3GT | $6.00 | RCA | 115% / 110% | --- | used (rb) | silver lettering - brown base |
| 1 | 5Y3GT | $6.00 | GE | 120% / 120% | --- | used (rb) | red lettering |
| 1 | 5Y3GT | $6.00 | GE | 110% / 110% | --- | used (rb) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 110% / 110% | --- | used (rb) | red lettering - JAN |
| 1 | 5Y3GT | $6.00 | Sylvania | 110% / 110% | --- | used (rb) | green lettering |
| 1 | 5Y3GT | $6.00 | Magnavox | 120% / 120% | --- | used (L) | --- |
| 1 | 5Y3GT | $6.00 | GE | 120% / 120% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 120% / 120% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 120% / 120% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 110% / 110% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 110% / 110% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 110% / 110% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 110% / 110% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 110% / 110% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 110% / 120% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 120% / 110% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 110% / 120% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 115% / 110% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 130% / 130% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 130% / 130% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 130% / 130% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | GE | 125% / 130% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 115% / 115% | --- | used (L) | yellow lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 120% / 120% | --- | used (L) | yellow lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 115% / 115% | --- | used (L) | yellow lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 110% / 110% | --- | used (L) | yellow lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 120% / 120% | --- | used (L) | yellow lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 110% / 120% | --- | used (L) | yellow lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 120% / 120% | --- | used (L) | green lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 120% / 110% | --- | used (L) | green lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 115% / 120% | --- | used (L) | green lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 120% / 110% | --- | used (L) | green lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 120% / 120% | --- | used (L) | green lettering |
| 1 | 5Y3GT | $6.00 | Sylvania | 110% / 115% | --- | used (L) | green lettering |
| 1 | 5Y3GT | $6.00 | RCA | 110% / 110% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $6.00 | RCA | 110% / 110% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $6.00 | RCA | 110% / 110% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $6.00 | RCA | 120% / 110% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $6.00 | RCA | 110% / 120% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $6.00 | RCA | 110% / 110% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $6.00 | RCA | 110% / 110% | --- | used (L) | red lettering |
| 1 | 5Y3GT | $6.00 | RCA | 120% / 115% | --- | used (L) | red lettering |
| 1 | 5Y3GT | $6.00 | RCA | 115% / 120% | --- | used (L) | red lettering |
| 1 | 5Y3GT | $6.00 | RCA | 125% / 125% | --- | used (L) | red lettering |
| 1 | 5Y3GT | $6.00 | Philco | 120% / 130% | --- | used (L) | --- |
| 1 | 5Y3GT | $6.00 | GM / Delco | 110% / 110% | --- | used (L) | --- |
| 1 | 5Y3GT | $5.00 | GE | 105% / 115% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $5.00 | GE | 100% / 100% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $5.00 | GE | 100% / 100% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $5.00 | GE | 105% / 105% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $5.00 | GE | 105% / 105% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $5.00 | GE | 110% / 100% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $5.00 | GE | 100% / 105% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $5.00 | GE | 100% / 110% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $5.00 | GE | 105% / 110% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $5.00 | RCA | 100% / 100% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $5.00 | Sylvania | 120% / 105% | --- | used (L) | green lettering |
| 1 | 5Y3GT | $5.00 | Sylvania | 100% / 100% | --- | used (L) | green lettering |
| 1 | 5Y3GT | $5.00 | Sylvania | 100% / 110% | --- | used (L) | yellow lettering |
| 1 | 5Y3GT | $2.50 | GE | 90% / 100% | --- | used (L) | white lettering |
| 1 | 5Y3GT | $2.50 | Sylvania | 90% / 95% | --- | used (L) | yellow lettering |
| 1 | 5Y3GT | $2.50 | RCA | 90% / 90% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $2.50 | RCA | 90% / 90% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $2.50 | RCA | 95% / 95% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $2.50 | RCA | 95% / 95% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $2.50 | RCA | 95% / 90% | --- | used (L) | silver lettering |
| 1 | 5Y3GT | $2.50 | RCA | 100% / 90% | --- | used (L) | silver lettering |
| 1 | 5Y3GT / VT-197A | $4.00 | Sylvania | 120% / 110% | --- | used (L) | JAN - white lettering - loose base |
| 1 | 5Y3GT | $3.00 | Sylvania | 120% / 120% | --- | used (L) | green lettering - loose base |
| 1 | 5Y3GT | $3.00 | Sylvania | 120% / 120% | --- | used (L) | green lettering - loose base |
| 1 | 5Y3GT | $3.00 | GE | 120% / 120% | --- | used (L) | white lettering - broken locator pin |
| 1 | 5Y3GT | $3.00 | GE | 120% / 115% | --- | used (L) | white lettering - broken locator pin |
| 1 | 5Y3GT | $3.00 | RCA | 120% / 120% | --- | used (L) | red lettering - broken locator pin |
| 1 | 5Y3GT | $3.00 | RCA | 120% / 120% | --- | used (L) | red lettering - loose base |
| 1 | 5Y3GT | $3.00 | RCA | 130% / 120% | --- | used (L) | red lettering - loose base |
| 1 | 5Y3GT | $3.00 | RCA | 130% / 130% | --- | used (L) | silver lettering - loose base |
| 1 | 5Y3GT | $3.00 | RCA | 110% / 120% | --- | used (L) | silver lettering - loose base |
| 1 | 5Y3GT | $3.00 | RCA | 115% / 115% | --- | used (L) | silver lettering - loose base |
| 1 | 5Y3GT | $3.00 | RCA | 115% / 115% | --- | used (L) | silver lettering - loose base |
| 1 | 5Y3GT | $3.00 | RCA | 110% / 110% | --- | used (L) | silver lettering - loose base |
| 1 | 5Y3GT | $3.00 | Motorola | 110% / 120% | --- | used (L) | loose base |
| 1 | 5Y3GT | $2.00 | RCA | 120% / 120% | --- | used (L) | silver lettering - loose base - broken locator pin |
| 1 | 5Y3GT | $2.00 | RCA | 100% / 95% | --- | used (L) | loose base |
| 1 | 5Y3GT | $2.00 | RCA | 90% / 90% | --- | used (L) | JAN - loose base |
| 1 | 5Y3GT | $2.00 | RCA | 95% / 95% | --- | used (L) | loose base |
| 1 | 5Y3GT | $2.00 | RCA | 90% / 90% | --- | used (L) | broken locator pin |
| 1 | 5Y3GT | $2.00 | Sylvania | 90% / 100% | --- | used (L) | yellow lettering - cracked base |
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| 1 | 5Y4GT | $8.00 | RCA | 120% / 120% | --- | NOS (OB) | red lettering |
| 1 | 5Y4GT | $8.00 | Tung-Sol | 120% / 120% | --- | NOS (OB) | --- |
| 1 | 5Y4GT | $7.50 | Raytheon | 120% / 120% | --- | NOS (OB) | --- |
| 1 | 5Y4GT | $7.50 | Raytheon | 120% / 120% | --- | NOS (OB) | torn box flap |
| 1 | 5Y4GT | $7.50 | Raytheon | 110% / 110% | --- | NOS (OB) | torn box flap |
| 1 | 5Y4GT | $7.50 | Westinghouse | 120% / 120% | --- | NOS (OB) | --- |
| 1 | 5Y4GT | $7.50 | Westinghouse | 120% / 120% | --- | NOS (OB) | --- |
| 1 | 5Y4GT | $7.00 | Westinghouse | 120% / 120% | --- | NOS (OB) | water damaged box |
| 1 | 5Y4GT | $4.00 | Westinghouse | 120% / 120% | --- | used (rb) | --- |
| 1 | 5Y4GT | $4.00 | Raytheon | 115% / 120% | --- | used (rb) | --- |
| 1 | 5Y4GT | $4.00 | Raytheon | 110% / 100% | --- | used (OB) | --- |
| 1 | 5Y4GT | $4.00 | GE | 120% / 120% | --- | used (rb) | --- |
| 1 | 5Y4GT | $4.00 | Tung-Sol | 120% / 120% | --- | used (rb) | --- |
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| 1 | 5Z4 / VT-74 | $7.50 | Ken-Rad | 110% / 110% | NOS (OB) | metal - JAN | |
| 1 | 5Z4 / VT-74 | $7.50 | Ken-Rad | 110% / 110% | NOS (OB) | metal - JAN | |
| 1 | 5Z4 / VT-74 | $7.50 | Ken-Rad | 110% / 110% | NOS (OB) | metal - JAN | |
| 1 | 5Z4 / VT-74 | $7.50 | Ken-Rad | 110% / 110% | NOS (OB) | metal - JAN | |
| 1 | 5Z4 | $5.00 | GE | 110% / 110% | NOS (OB) | metal - sealed in box | |
| 1 | 5Z4 | $5.00 | GE | 110% / 110% | NOS (wb) | metal - white lettering | |
| 1 | 5Z4 | $5.00 | Sylvania | 110% / 110% | NOS (OB) | metal - green letterig | |
| 1 | 5Z4 / VT-74 | $3.00 | Ken-Rad | 120% / 115% | used (ob) | metal - JAN | |
| 1 | 5Z4 | $2.00 | RCA | 110% / 110% | used (rb) | metal - JAN - silver lettering | |
| 1 | 5Z4 | $2.00 | RCA | 110% / 110% | used (OB) | metal - silver lettering | |
| 1 | 5Z4 | $2.00 | RCA | 110% / 110% | used (OB) | metal - silver lettering | |
| 1 | 5Z4 | $2.00 | RCA | 110% / 110% | used (OB) | metal - silver lettering | |
| 1 | 5Z4 | $2.00 | RCA | 110% / 110% | used (rb) | metal - silver lettering | |
| 1 | 5Z4 | $2.00 | National Union | 110% / 110% | used (rb) | metal | |
| 1 | 5Z4 | $2.00 | Raytheon | 110% / 110% | used (OB) | metal | |
| 1 | 5Z4 | $2.00 | Raytheon | 110% / 110% | used (rb) | metal | |
| 1 | 5Z4 | $2.00 | GE | 110% / 110% | used (wb) | metal (cat:402-293) | |
| 1 | 5Z4 | $2.00 | Raytheon | 110% / 110% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | Raytheon | 110% / 110% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | Raytheon | 110% / 110% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | Raytheon | 105% / 105% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | Tung-Sol | 105% / 110% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | Wards Super Airline | 110% / 110% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | RCA | 100% / 110% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | RCA | 105% / 105% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | RCA | 110% / 110% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | RCA | 110% / 110% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | RCA | 110% / 105% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | RCA | 120% / 120% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | RCA | 110% / 105% | used (L) | metal - JAN | |
| 1 | 5Z4 | $2.00 | RCA | 100% / 100% | used (L) | metal | |
| 1 | 5Z4 | $2.00 | RCA | 110% / 110% | used (L) | metal - JAN | |
| 1 | 5Z4 / VT-74 | $2.00 | RCA | 110% / 110% | used (L) | metal - JAN | |
| 1 | 5Z4 / VT-74 | $1.00 | RCA | 100% / 100% | used (L) | metal - minor rust on tube | |
| 1 | 5Z4 | $1.00 | RCA Victor | 90% / 90% | used (rb) | metal | |
| 1 | 5Z4 / VT-74 | $1.00 | RCA | 95% / 100% | used (rb) | metal - JAN | |
| 1 | 5Z4 / VT-74 | $1.00 | Ken-Rad | 120% / 110% | used (rb) | metal - minor rust on tube | |
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, (TT)=Tall Tubular, (M7)=7pin miniature,
M9=9pin miniature, (SM)=subminiature, 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 audio 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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Don't forget to visit our
Discount Bargain Packs
and
Bargain Bin
for more savings!
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