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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 5AS4-A $30.00 RCA 110% / 110% --- NOS (wb) ---
1 5AS4-A $24.00 GE 110% / 110% --- NOS (OB) ---
1 5AS4-A $24.00 Sylvania 110% / 110% --- NOS (OB) ---
1 5AS4-A $24.00 Sylvania 110% / 110% --- NOS (OB) ---
1 5AS4-A $24.00 Sylvania 110% / 110% --- NOS (OB) ---
1 5AS4-A $24.00 Sylvania 110% / 110% --- NOS (OB) ---
1 5AS4-A $20.00 Admiral 110% / 110% --- NOS (OB) ---
1 5AS4-A $20.00 Admiral 110% / 110% --- NOS (OB) ---
1 5AS4-A $20.00 Admiral 110% / 110% --- NOS (OB) ---
1 5AS4-A $18.00 Dumont 110% / 110% --- NOS (OB) ---
1 5AS4-A $12.00 RCA 110% / 110% --- used (rb) ---
1 5AS4-A $12.00 RCA 100% / 100% --- used (rb) ---
1 5AS4-A $12.00 RCA 100% / 100% --- used (L) ---
1 5AS4-A $12.00 RCA 110% / 110% --- used (L) ---
1 5AS4-A $7.50 RCA 95% / 100% --- used (L) ---
1 5AS4-A $7.50 Raytheon 100% / 100% --- used (L) ---
1 5AS4-A $7.50 Raytheon 100% / 100% --- used (L) ---
1 5AS4-G $25.00 RCA 105% / 105% --- used (L) ---
1 5U4-GB / 5AS4-A $10.00 RCA 105% / 105% --- used (L) ---
1 5R4-WGB $20.00 Chatham 110% / 110% --- NOS (OB) JAN - tall tan base
1 5R4-GYA $20.00 GE 110% / 105% --- NOS (wb) (GT) brown base
1 5R4-GYA $20.00 GE 110% / 110% --- NOS (wb) (GT) brown base
1 5R4-GYA $20.00 GE 110% / 110% --- NOS (wb) (GT) brown base - cat:403-280-1
1 5R4-GYA $20.00 GE 110% / 110% --- NOS (wb) (GT) brown base - cat:403-280-2
1 5R4-GYB $30.00 Sylvania 110% / 110% --- NOS (wb) (GT) black base (Paramount Ford NEC RCA etched on glass)
1 5R4-GYB $20.00 Sylvania 110% / 110% --- NOS (wb) (GT) black base
1 5R4-GYB $20.00 RCA 110% / 110% --- NOS (wb) (GT) brown base
1 5R4-GYB $20.00 RCA 110% / 110% --- NOS (wb) (GT) black base
1 5R4-GYB $20.00 RCA 110% / 110% --- NOS (wb) (GT) brown base
1 5R4-GYB $20.00 Amperex 110% / 110% --- NOS (wb) (GT) brown base
1 5R4-GYB $20.00 Motorola 110% / 110% --- NOS (OB) (GT) black base - damaged box
1 5R4-GYB $15.00 Tung-Sol 110% / 110% --- used (OB) (GT) brown base
1 5T4 / VT114 $20.00 RCA 100% / 100% used (L) JAN (cat: 404-16a) metal 5U4
1 5T4 / VT114 $20.00 RCA 100% / 100% used (L) JAN (cat: 404-16b) metal 5U4
1 5T4 $15.00 RCA 90% / 85% used (L) (cat: 404-14b) metal 5U4
1 5T4 / VT114 $15.00 RCA 95% / 100% used (L) JAN (cat: 404-14a) metal 5U4
1 5W4-G $7.50 RCA 110% / 110% used (rb) (cat: 312-392)
1 5W4-G $5.00 GE 100% / 100% used (ob) ---
1 5W4-G $2.50 Firestone Air Chief 60% / 60% --- used (L) by Ken-Rad
1 5Y3-G $20.00 National Union 110% / 110% --- used (L) ---
1 5Y3-G $20.00 National Union 110% / 115% --- used (L) ---
1 5Y3-G $20.00 National Union 120% / 115% --- used (L) ---
1 5Y3-G $15.00 National Union 105% / 105% --- used (L) ---
1 5Y3-G $15.00 National Union 100% / 115% --- used (L) ---
1 5Y3-G $15.00 National Union 100% / 100% --- used (L) ---
1 5Y3-G $15.00 National Union 100% / 100% --- used (rb) ---
1 5Y3-G $15.00 Sylvania 100% / 100% --- used (L) ---
1 5Y3-G $12.00 Sylvania 90% / 90% --- used (L) ---
1 5Y3-G $12.00 RCA 90% / 90% --- used (L) ---
1 5Y4-G $7.50 GE 90% / 90% --- used (L) ---
1 5Y4-G $5.00 GE 90% / 85% --- used (L) ---
1 5Y4-G $5.00 RCA Victor 80% / 80% --- used (L) ---
1 5Y4-G $5.00 Wards Airline 80% / 90% --- used (L) ---
1 5Y4-GA $7.50 RCA 110% / 110% --- used (L) ---
1 5Y4-GA $7.50 Sylvania 100% / 100% --- used (L) ---
1 5931 / 5U4 $40.00 Sylvania 100% / 100% --- NOS (wb) brown base
1 5931 / 5U4GBW $20.00 Sylvania 100% / 100% --- used (wb) brown base - JAN
1 5931 / 5U4GBW $20.00 unknown (Sylvania?) 110% / 110% --- used (wb) brown base - JAN
1 5931 / 5U4 $15.00 Sylvania 100% / 100% --- used (wb) brown base - JAN
1 5931 / 5U4 $15.00 Sylvania 100% / 100% --- used (wb) brown base - JAN
1 5931 / 5U4 $15.00 Sylvania 100% / 100% --- used (L) brown base
1 5931 / 5U4 $15.00 unknown (Sylvania?) 100% / 100% --- used (L) brown base
1 5931 / 5U4 $15.00 Sylvania 100% / 95% --- used (L) brown base
1 5X4-G $4.00 Philco 80% / 80% --- used (L) engraved base
1 5X4-G $4.00 Silvertone 90% / 90% --- used (L) ---

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