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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
1 6CA4 $30.00 Zenith 110% / 100% --- NOS (OB) (M9) usa
1 6CA4 $25.00 Magnavox 110% / 110% --- NOS (OB) (M9) Japan
1 6CA4 $15.00 Mazda 100% / 100% --- used (rb) (M9) ---
1 6CA4 $15.00 Magnavox 110% / 100% --- used (wb) (M9) usa
1 6CA4 $15.00 Raytheon 105% / 110% --- used (wb) (M9) usa
1 6CA4 $15.00 Curtis Mathes 110% / 100% --- used (wb) (M9) Japan
1 6CA4 $10.00 unknown 100% / 110% --- used (wb) (M9) gt. britain
1 6CA4 $10.00 unknown 100% / 110% --- used (wb) (M9) england
1 6CA4 $7.50 unknown 120% / 90% --- used (wb) (M9) england
1 6CA4 $7.50 unknown 110% / 90% --- used (wb) (M9) usa
1 6202 / 6X4WA $7.50 GE 120% / 120% --- NOS (OB) (M7) green lettering - special 6X4 - JAN
1 6202 / 6X4WA $7.50 GE 120% / 120% --- NOS (OB) (M7) green lettering - special 6X4 - JAN
1 6202 / 6X4W $7.50 GE 120% / 110% --- NOS (OB) (M7) white lettering - special 6X4
1 6202 / 6X4WA $7.50 Sylvania 110% / 110% --- NOS (OB) (M7) gold lettering - special 6X4 - FAA
1 6X4-WA $7.50 GE 110% / 110% --- NOS (OB) (M7) white lettering
1 6X4WA $7.50 Sylvania 120% / 120% --- NOS (OB) (M7) green lettering
1 6X4WA $7.50 Sylvania 120% / 120% --- NOS (OB) (M7) green lettering
1 6X4WA $7.50 Sylvania 120% / 120% --- NOS (OB) (M7) green lettering
1 6X4WA $7.50 Sylvania 130% / 130% --- NOS (OB) (M7) white lettering
1 6X4WA $7.50 Sylvania 120% / 120% --- NOS (OB) (M7) gold lettering
1 6202 $7.50 RCA 110% / 110% --- NOS (OB) (M7) red lettering - special 6X4
1 6202 $7.50 GE 120% / 120% --- NOS (OB) (M7) white lettering - special 6X4 - torn box flap
1 6202 $7.50 Westinghouse 120% / 140% --- NOS (OB) (M7) special 6X4
1 6X4W $7.50 Raytheon 130% / 120% --- NOS (OB) (M7) damaged box
1 6X4W $7.50 Sylvania 120% / 120% --- NOS (OB) (M7) green lettering
1 6X4W $7.50 Sylvania 120% / 120% --- NOS (OB) (M7) green lettering - damaged box
1 EZ-90 / 6X4 $7.50 International Servicemaster 120% / 120% --- NOS (OB) (M7) ---
1 6X4 $5.00 RCA 110% / 110% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 RCA 115% / 115% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 RCA 115% / 115% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 RCA 115% / 110% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 RCA 120% / 120% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 120% / 130% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 120% / 120% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 110% / 120% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 110% / 120% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 120% / 110% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 120% / 110% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 125% / 125% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 115% / 110% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 115% / 120% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 RCA 115% / 115% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 RCA 120% / 120% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 RCA 115% / 115% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 RCA 115% / 120% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 RCA 110% / 110% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 115% / 120% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 110% / 110% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 RCA 110% / 110% --- NOS (wb) (M7) red lettering
1 6X4 $5.00 GE 130% / 130% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 GE 130% / 120% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 GE 120% / 120% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 GE 120% / 120% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 GE 110% / 120% --- NOS (OB) (M7) white lettering
1 6X4 $5.00 Sylvania 110% / 115% --- NOS (OB) (M7) yellow lettering
1 6X4 $5.00 Rogers 120% / 120% --- NOS (OB) (M7) torn box flap
1 6X4 $5.00 Rogers 120% / 120% --- NOS (OB) (M7) ---
1 6X4 $5.00 Philco 120% / 120% --- NOS (OB) (M7) ---
1 6X4 $5.00 Philco 130% / 130% --- NOS (OB) (M7) ---
1 6X4 $5.00 Delco 120% / 110% --- NOS (OB) (M7) ---
1 6X4 $5.00 Westinghouse 110% / 110% --- NOS (OB) (M7) torn box flap
1 6X4 $5.00 Westinghouse 130% / 140% --- NOS (OB) (M7) ---
1 6X4 $5.00 ITT 120% / 125% --- NOS (OB) (M7) ---
1 6X4 $5.00 ITT 130% / 130% --- NOS (OB) (M7) ---
1 6X4 $5.00 Motorola 130% / 125% --- NOS (OB) (M7) ---
1 6X4 $5.00 National Union 120% / 120% --- NOS (OB) (M7) ---
1 6X4 $5.00 Zenith 130% / 120% --- NOS (OB) (M7) ---
1 6X4 $5.00 Sylvania 110% / 110% --- NOS (OB) (M7) yellow lettering
1 6X4 $5.00 Sylvania 120% / 120% --- NOS (OB) (M7) yellow lettering
1 6X4 $5.00 Sylvania 120% / 120% --- NOS (OB) (M7) yellow lettering
1 6X4 $5.00 Sylvania 120% / 120% --- NOS (OB) (M7) yellow lettering
1 6X4 $5.00 Sylvania 130% / 130% --- NOS (OB) (M7) yellow lettering
1 6X4 $5.00 Sylvania 130% / 140% --- NOS (OB) (M7) yellow lettering
1 6X4 $5.00 Sylvania 130% / 130% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 Sylvania 130% / 120% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 Sylvania 120% / 120% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 Sylvania 120% / 120% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 Sylvania 120% / 120% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 Sylvania 115% / 120% --- NOS (OB) (M7) red lettering
1 6X4 $5.00 CBS 110% / 110% --- NOS (OB) (M7) ---
1 6X4 $5.00 Philco 110% / 110% --- NOS (OB) (M7) ---
1 6X4 $5.00 Western Union 120% / 120% --- NOS (OB) (M7) ---
1 6X4 $5.00 Conn 120% / 120% --- NOS (OB) (M7) ---
1 6X4 $5.00 Simplex 110% / 120% --- NOS (OB) (M7) damaged box
1 6X4 $4.00 IEC / Mullard 120% / 120% --- used (L) (M7) ---
1 6X4 $2.50 unknown 120% / 120% --- used (rb) (M7) black coat
1 6X4 / EZ90 $5.00 Eico 110% / 110% --- used (rb) (M7) Italy
1 6202 / 6X4-WA $2.50 GE 100% / 115% --- used (wb) (M9) ---
1 6202 / 6X4-WA $2.50 GE 120% / 120% --- used (wb) (M9) green lettering - JAN
1 6202 / 6X4-WA $2.50 GE 110% / 110% --- used (wb) (M9) green lettering - JAN
1 6202 / 6X4-WA $2.50 Westinghouse 110% / 110% --- used (rb) (M7) ---
1 6X4-WA $2.50 Sylvania 120% / 120% --- used (rb) (M7) green lettering
1 6X4-WA $2.50 Sylvania 120% / 120% --- used (rb) (M7) green lettering
1 6X4-WA $2.50 unknown 110% / 110% --- used (wb) (M7) ---
1 6X4 $2.50 GE 110% / 120% --- used (rb) (M7) white lettering
1 6X4 $2.50 Philco 105% / 110% --- used (rb) (M7) ---
1 6X4 $2.50 RCA 120% / 120% --- used (rb) (M7) white lettering
1 6X4 $2.50 RCA 110% / 120% --- used (rb) (M7) white lettering
1 6X4 $2.50 RCA 125% / 130% --- used (rb) (M7) white lettering
1 6X4 $2.50 RCA 120% / 120% --- used (rb) (M7) white lettering
1 6X4 $2.50 RCA 130% / 130% --- used (rb) (M7) white lettering
1 6X4 $2.50 RCA 110% / 110% --- used (rb) (M7) red lettering
1 6X4 $2.50 RCA 120% / 120% --- used (rb) (M7) red lettering
1 6X4 $2.50 RCA Victor 120% / 120% --- used (rb) (M7) ---
1 6X4 $2.50 Fisher 120% / 120% --- used (rb) (M7) made by GE
1 6X4 $2.50 GE 115% / 120% --- used (rb) (M7) white lettering
1 6X4 $2.50 GE 130% / 130% --- used (ob) (M7) red lettering
1 6X4 $2.50 GE 120% / 120% --- used (rb) (M7) red lettering
1 6X4 $2.50 Sylvania 120% / 100% --- used (rb) (M7) yellow lettering
1 6X4 $2.50 Sylvania 130% / 120% --- used (rb) (M7) yellow lettering
1 6X4 $2.50 Sylvania 115% / 100% --- used (rb) (M7) yellow lettering
1 6X4 $2.50 FoMoCo 120% / 120% --- used (wb) (M7) ---
1 6X4 $2.50 Conn 120% / 120% --- used (wb) (M7) ---
1 6X4 $2.50 Motorola 110% / 110% --- used (rb) (M7) ---
1 6X4 $2.50 Raytheon 110% / 110% --- used (rb) (M7) ---
1 6X4 $2.50 B&K 120% / 120% --- used (rb) (M7) ---
1 6X4 $2.50 Philco 130% / 130% --- used (rb) (M7) ---
1 6X4 $2.50 Shield 100% / 110% --- used (ob) (M7) ---
1 6X4 $2.50 Automatic Radio 120% / 120% --- used (rb) (M7) ---
1 6X4 $2.50 Westinghouse 120% / 110% --- used (OB) (M7) ---
1 6X4 $2.50 NEC 120% / 120% --- used (rb) (M7) ---
1 6X4 $2.50 Philco 120% / 120% --- used (L) (M7) ---
1 6X4 $2.50 Raytheon 120% / 120% --- used (L) (M7) ---
1 6X4W $2.50 Raytheon 130% / 120% --- used (L) (M7) ---
1 6X4W $2.50 Raytheon 130% / 120% --- used (L) (M7) ---
1 6X4WA $2.50 Sylvania 120% / 120% --- used (L) (M7) ---
1 6X4WA $2.50 Sylvania 110% / 110% --- used (L) (M7) ---
1 6X4 $2.50 RCA 110% / 110% --- used (L) (M7) red lettering
1 6X4 $2.50 RCA 110% / 100% --- used (L) (M7) red lettering
1 6X4 $2.50 RCA 120% / 120% --- used (L) (M7) red lettering
1 6X4 $2.50 RCA 110% / 110% --- used (L) (M7) red lettering
1 6X4 $2.50 RCA 110% / 115% --- used (L) (M7) red lettering
1 6X4 $2.50 RCA 120% / 120% --- used (L) (M7) red lettering
1 6X4 $2.50 RCA 120% / 120% --- used (L) (M7) red lettering
1 6X4 $2.50 RCA 105% / 110% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 110% / 100% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 115% / 120% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 110% / 110% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 110% / 110% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 110% / 110% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 110% / 110% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 120% / 120% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 120% / 120% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 120% / 120% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 120% / 120% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 130% / 120% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 130% / 120% --- used (L) (M7) white lettering
1 6X4 $2.50 RCA 115% / 120% --- used (L) (M7) white lettering
1 6X4WA $2.50 unknown 110% / 110% --- used (L) (M7) ---
1 6X4WA $2.50 unknown 120% / 120% --- used (L) (M7) ---
1 6X4WA $2.50 unknown 130% / 130% --- used (L) (M7) ---
1 6X4W $2.50 unknown 130% / 120% --- used (L) (M7) ---
1 6X4 $2.50 unknown 120% / 120% --- used (rb) (M7) ---
1 6X4 $2.50 unknown 120% / 120% --- used (rb) (M7) ---
1 6X4 $2.50 unknown 120% / 120% --- used (rb) (M7) ---
1 6X4 $2.50 unknown 110% / 110% --- used (rb) (M7) ---
1 6X4 $2.50 unknown 110% / 120% --- used (rb) (M7) ---
1 6X4 $1.00 Motorola 100% / 95% --- used (rb) (M7) ---
1 6X4 $1.00 RCA 100% / 90% --- used (L) (M7) white lettering
1 6X4 $1.00 RCA 90% / 100% --- used (rb) (M7) red lettering
1 6X4 $1.00 unknown 110% / 110% --- used (rb) (M7) ---
1 6X4 $1.00 unknown 90% / 100% --- used (L) (M7) ---
1 6203 $5.00 Amperex 110% / 110% --- NOS (OB) (M7) world logo
1 6203 $5.00 GE 110% / 110% --- NOS (OB) (M7) green lettering
1 6203 $5.00 GE 110% / 110% --- NOS (OB) (M7) green lettering
1 6203 $5.00 GE 110% / 110% --- NOS (OB) (M7) green lettering - missing box flap
1 6203 $5.00 GE 110% / 110% --- NOS (OB) (M7) white lettering
1 6203 $5.00 GE 110% / 110% --- NOS (OB) (M7) white lettering
1 6203 $2.50 GE 110% / 110% --- used (rb) (M7) white lettering - 5 star
1 6203 $2.50 GE 110% / 110% --- used (rb) (M7) white lettering - 5 star
1 6203 $2.50 GE 100% / 100% --- used (rb) (M7) white lettering - 5 star
1 6203 $2.50 GE 110% / 110% --- used (L) (M7) white lettering
1 6203 $2.50 unknown 110% / 115% --- used (L) (M7) ---
1 6203 $2.50 unknown 105% / 120% --- used (L) (M7) ---
1 12X4 / HZ90 $10.00 Amperex 110% / 110% --- NOS (OB) (M7) bugle boy
1 12X4 $5.00 RCA 110% / 110% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 110% / 110% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 110% / 110% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 120% / 120% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 120% / 110% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 115% / 120% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 110% / 110% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 110% / 110% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 115% / 115% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 110% / 110% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 110% / 110% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 110% / 110% --- NOS (OB) (M7) red lettering
1 12X4 $5.00 RCA 115% / 115% --- NOS (OB) (M7) white lettering - worn box
1 12X4 $5.00 GE 120% / 120% --- NOS (OB) (M7) white lettering
1 12X4 $5.00 GE 110% / 115% --- NOS (OB) (M7) white lettering
1 12X4 $5.00 GE 120% / 115% --- NOS (OB) (M7) white lettering
1 12X4 $5.00 GE 120% / 120% --- NOS (OB) (M7) white lettering
1 12X4 $5.00 GE 120% / 120% --- NOS (OB) (M7) white lettering - box flap missing
1 12X4 $5.00 GE 115% / 115% --- NOS (OB) (M7) white lettering
1 12X4 $5.00 GE 115% / 110% --- NOS (OB) (M7) red lettering - water damaged box
1 12X4 $5.00 GE 120% / 120% --- NOS (OB) (M7) white lettering
1 12X4 $5.00 Sylvania 120% / 120% --- NOS (OB) (M7) yellow lettering
1 12X4 $5.00 Sylvania 115% / 115% --- NOS (OB) (M7) yellow lettering
1 12X4 $5.00 Sylvania 115% / 115% --- NOS (OB) (M7) yellow lettering
1 12X4 $5.00 Sylvania 110% / 110% --- NOS (OB) (M7) yellow lettering
1 12X4 $5.00 Sylvania 110% / 120% --- NOS (OB) (M7) yellow lettering
1 12X4 $5.00 Motorola 110% / 110% --- NOS (OB) (M7) ---
1 12X4 $5.00 Motorola 110% / 110% --- NOS (OB) (M7) ---
1 12X4 $5.00 Motorola 110% / 110% --- NOS (OB) (M7) ---
1 12X4 $5.00 Motorola 110% / 110% --- NOS (OB) (M7) ---
1 12X4 $5.00 Motorola 110% / 110% --- NOS (OB) (M7) ---
1 12X4 $5.00 Motorola 110% / 110% --- NOS (OB) (M7) ---
1 12X4 $5.00 Motorola 110% / 110% --- NOS (OB) (M7) ---
1 12X4 $5.00 Motorola 110% / 105% --- NOS (OB) (M7) ---
1 12X4 $5.00 Motorola 120% / 110% --- NOS (OB) (M7) ---
1 12X4 $5.00 Motorola 115% / 115% --- NOS (OB) (M7) ---
1 12X4 $5.00 Dumont 110% / 110% --- NOS (OB) (M7) ---
1 12X4 $5.00 Zenith 115% / 115% --- NOS (OB) (M7) ---
1 12X4 $5.00 CBS 110% / 110% --- NOS (OB) (M7) ---
1 12X4 $5.00 CBS 120% / 110% --- NOS (OB) (M7) torn box flap
1 12X4 $5.00 Triad 120% / 125% --- NOS (OB) (M7) ---
1 12X4 $5.00 Westinghouse 110% / 110% --- NOS (OB) (M7) ---
1 12X4 $5.00 GE 110% / 110% --- NOS (wb) (M7) white lettering
1 12X4 $2.50 Delta 110% / 110% --- used (rb) (M7) ---
1 12X4 $2.50 Automatic Radio 110% / 110% --- used (rb) (M7) ---
1 12X4 $2.50 unknown 110% / 120% --- used (rb) (M7) ---
1 12X4 $2.50 unknown 100% / 100% --- used (rb) (M7) ---
1 12X4 $2.50 unknown 90% / 100% --- used (rb) (M7) ---
1 12X4 $2.50 RCA 110% / 105% --- used (OB) (M7) red lettering
1 12X4 $2.50 Dynaco 110% / 105% --- used (OB) (M7) ---
1 12X4 $2.50 unknown 110% / 110% --- used (OB) (M7) ---
1 12X4 $2.50 GE 120% / 110% --- used (ob) (M7) white lettering
1 12X4 $2.50 Webcor 120% / 120% --- used (rb) (M7) ---

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