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 6C6 $4.00 Super Silvertone 115% 1300 / 1225Gm ST - used (L) --
1 6C6 $4.00 National Union 110% 1300 / 1225Gm ST - used (L) --
1 6C6 $4.00 RCA 125% 1450 / 1225Gm ST - used (L) --
1 6C6 $4.00 National Union 140% 1500 / 1225Gm ST - used (L) --
1 6C6 $4.00 Sylvania 140% 1550 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 Sylvania 140% 1500 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 RCA 120% 1450 / 1225Gm ST - used (L) JAN
1 6C6 $4.00 Tung-Sol 110% 1250 / 1225Gm ST - used (L) --
1 6C6 $4.00 RCA / Cunningham 130% 1450 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 RCA 120% 1400 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 National Union 105% 1220 / 1225Gm ST - used (L) --
1 6C6 $4.00 Arcturus 140% 1600 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 Sylvania 140% 1400 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 Sylvania 140% 1500 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 International 110% 1200 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 RCA / Cunningham 100% 1100 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 Champion 100% 1150 / 1225Gm ST - used (L) --
1 6C6 $4.00 Tung-Sol 130% 1400 / 1225Gm ST - used (L) --
1 6C6 $4.00 Triad 140% 2000 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 RCA Victor 105% 1100 / 1225Gm ST - used (L) --
1 6C6 $4.00 Tung-Sol 115% 1350 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 Sylvania 110% 1200 / 1225Gm ST - used (L) --
1 6C6 $4.00 RCA 110% 1350 / 1225Gm ST - used (L) --
1 6C6 $4.00 RCA 130% 1500 / 1225Gm ST - used (L) engraved base - cat:312-40
1 6C6 $4.00 RCA 140% 1450 / 1225Gm ST - used (L) --
1 6C6 $4.00 Hytron 130% 1450 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 Super Airline 130% 1400 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 Super Silvertone 130% 1350 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 Tung-Sol 120% 1300 / 1225Gm ST - used (L) --
1 6C6 $4.00 RCA 115% 1300 / 1225Gm ST - used (L) --
1 6C6 $4.00 RCA 100% 1200 / 1225Gm ST - used (L) --
1 6C6 $4.00 National Union 130% 1450 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 RCA 120% 1400 / 1225Gm ST - used (L) cat:312-349
1 6C6 $4.00 National Union 120% 1400 / 1225Gm ST - used (L) --
1 6C6 $4.00 Super Silvertone 130% 1450 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 Natioanl Union 110% 1350 / 1225Gm ST - used (L) --
1 6C6 $4.00 RCA 120% 1450 / 1225Gm ST - used (L) --
1 6C6 $4.00 Sylvania 130% 1450 / 1225Gm ST - used (L) --
1 6C6 $4.00 RCA / Cunningham 140% 1600 / 1225Gm ST - used (L) engarved base
1 6C6 $4.00 Tung-Sol 130% 1500 / 1225Gm ST - used (L) engraved base - cat:312-142
1 6C6 $4.00 RCA 130% 1500 / 1225Gm ST - used (L) --
1 6C6 $4.00 RCA / Cunningham 130% 1550 / 1225Gm ST - used (L) cat:312-46
1 6C6 $4.00 National Union 120% 1300 / 1225Gm ST - used (L) --
1 6C6 $4.00 Sylvania 130% 1450 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 Arcturus 140% 1700 / 1225Gm ST - used (L) --
1 6C6 $4.00 Sylvania 125% 1400 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 Hytron 110% 1250 / 1225Gm ST - used (L) paint on tube
1 6C6 $4.00 Westinghouse 130% 1400 / 1225Gm ST - used (L) --
1 6C6 $4.00 National Union 120% 1300 / 1225Gm ST - used (L) --
1 6C6 $4.00 National Union 130% 1400 / 1225Gm ST - used (L) --
1 6C6 $4.00 National Union 120% 1350 / 1225Gm ST - used (L) --
1 6C6 $4.00 Super Silvertone 110% 1250 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 Sylvania 130% 1450 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 Philco 110% 1225 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 Philco 130% 1450 / 1225Gm ST - used (L) --
1 6C6 $4.00 GE 100% 1300 / 1225Gm ST - used (L) cat:312-50
1 6C6 $4.00 Hytron 100% 1250 / 1225Gm ST - used (L) cat:312-53
1 6C6 $4.00 RCA 120% 1350 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 RCA 140% 1650 / 1225Gm ST - used (L) --
1 6C6 $4.00 RCA 130% 1500 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 National Union 110% 1225 / 1225Gm ST - used (L) --
1 6C6 $4.00 Sylvania 125% 1450 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 Sylvania 140% 1550 / 1225Gm ST - used (L) --
1 6C6 $4.00 Sylvania 140% 1550 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 Sonatron 140% 1750 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 RCA 130% 1450 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 Triad 105% 1150 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 National Union 120% 1350 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 Sylvania 120% 1450 / 1225Gm ST - used (L) --
1 6C6 $4.00 Sylvania 130% 1450 / 1225Gm ST - used (L) US Navy
1 6C6 $4.00 Raytheon 130% 1400 / 1225Gm ST - used (L) --
1 6C6 $4.00 Triad 140% 1500 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 National Union 140% 1300 / 1225Gm ST - used (L) engraved base
1 6C6 $4.00 Ken-Rad 140% 1800 / 1225Gm ST - used (L) engraved base - cat:401-135
1 6C6 $2.50 National Union 90% 950 / 1225Gm ST - used (L) --
1 6C6 $2.50 National Union 95% 900 / 1225Gm ST - used (L) --
1 6C6 $2.50 Ken-Rad 85% 1050 / 1225Gm ST - used (L) --
1 6C6 $2.50 RadioCoin 90% 1300 / 1225Gm ST - used (L) --
1 6D6 $4.00 GM 140% 2800 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 National Union 110% 2000 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 National Union 115% 2450 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 National Union 115% 2150 / 1600Gm ST - used (L) --
1 6D6 $4.00 Marconi 110% 2000 / 1600Gm ST - used (L) --
1 6D6 / VT-69 $4.00 RCA 110% 2000 / 1600Gm ST - used (L) JAN - cat:312-15
1 6D6 $4.00 RCA 110% 2100 / 1600Gm ST - used (L) US Navy
1 6D6 $4.00 Ken-Rad 110% 1900 / 1600Gm ST - used (L) cat:32-381
1 6D6 $4.00 Unknown 130% 2250 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA 110% 1900 / 1600Gm ST - used (L) --
1 6D6 $4.00 Coronado 110% 2100 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA 120% 2300 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA 110% 2100 / 1600Gm ST - used (L) US Navy
1 6D6 $4.00 Tung-Sol 100% 1900 / 1600Gm ST - used (L) --
1 6D6 $4.00 Sylvania 120% 2000 / 1600Gm ST - used (L) cat:401-199
1 6D6 $4.00 Ken-Rad 105% 2000 / 1600Gm ST - used (L) --
1 6D6 $4.00 Arcturus 110% 2000 / 1600Gm ST - used (L) --
1 6D6 $4.00 National Union 110% 2100 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA 105% 1900 / 1600Gm ST - used (L) --
1 6D6 $4.00 Sylvania 110% 2100 / 1600Gm ST - used (L) --
1 6D6 $4.00 Super Airline 100% 2450 / 1600Gm ST - used (L) engaved base
1 6D6 $4.00 Crosley by Ken-Rad 120% 2100 / 1600Gm ST - used (L) engraved base - cat:312-26
1 6D6 $4.00 National Union 120% 2050 / 1600Gm ST - used (L) cat:401-126
1 6D6 $4.00 RCA 110% 1950 / 1600Gm ST - used (L) US Navy
1 6D6 $4.00 RCA 100% 1750 / 1600Gm ST - used (L) US Navy
1 6D6 $4.00 RCA / Cunningham 100% 2000 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 National Union 110% 2150 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Philco 110% 2200 / 1600Gm ST - used (L) --
1 6D6 $4.00 Marconi 105% 2050 / 1600Gm ST - used (L) --
1 6D6 $4.00 Hytron 110% 2100 / 1600Gm ST - used (L) cat:312-27
1 6D6 $4.00 RCA 100% 2100 / 1600Gm ST - used (L) --
1 6D6 $4.00 Ken-Rad 120% 1900 / 1600Gm ST - used (L) cat: 401-193
1 6D6 $4.00 RCA 120% 2100 / 1600Gm ST - used (L) cat:403-127
1 6D6 $4.00 Tung-Sol 110% 1950 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA Victor 105% 2000 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA / Cunningham 110% 2000 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Tung-Sol 100% 1600 / 1600Gm ST - used (L) --
1 6D6 $4.00 National Union 120% 2300 / 1600Gm ST - used (L) --
1 6D6 $4.00 National Union 120% 2450 / 1600Gm ST - used (L) --
1 6D6 $4.00 Ken-Rad 100% 1650 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA 120% 1950 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA / Cunningham 105% 1950 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Philco 100% 1850 / 1600Gm ST - used (L) --
1 6D6 $4.00 National Union 100% 2050 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 RCA 115% 2200 / 1600Gm ST - used (L) --
1 6D6 $4.00 Tung-Sol 100% 1950 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Super Silvertone 110% 1950 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Crosley by Ken-Rad 105% 2100 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Philco 110% 2000 / 1600Gm ST - used (L) --
1 6D6 $4.00 Ken-Rad 100% 1900 / 1600Gm ST - used (L) --
1 6D6 $4.00 Hytron 100% 1800 / 1600Gm ST - used (L) --
1 6D6 $4.00 National Union 115% 2300 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 National Union 110% 1950 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA 105% 1900 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA / Cunningham 110% 1900 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 National Union 105% 1700 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA / Cunningham 100% 1850 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Ken-Rad 105% 1900 / 1600Gm ST - used (L) --
1 6D6 $4.00 Ken-Rad 100% 1850 / 1600Gm ST - used (L) --
1 6D6 $4.00 Sylvania 100% 1600 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 National Union 125% 2050 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Wizard 110% 1750 / 1600Gm ST - used (L) --
1 6D6 $4.00 Tung-Sol 110% 1800 / 1600Gm ST - used (L) --
1 6D6 $4.00 National Union 105% 1850 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Champion 100% 1750 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA / Cunningham 100% 1700 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 RCA / Cunningham 100% 2050 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 National Union 120% 2400 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 National Union 110% 2000 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 National Union 120% 2000 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 RCA / Victor 110% 1950 / 1600Gm ST - used (L) --
1 6D6 $4.00 Troy 100% 1800 / 1600Gm ST - used (L) --
1 6D6 $4.00 National Union 105% 2000 / 1600Gm ST - used (L) --
1 6D6 $4.00 General Motors 130% 2300 / 1600Gm ST - used (L) engraved base - cat:312-14
1 6D6 $4.00 RCA 100% 1600 / 1600Gm ST - used (L) cat: 312-25
1 6D6 $4.00 National Union 100% 1850 / 1600Gm ST - used (L) --
1 6D6 $4.00 Super Silvertone 100% 1900 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Sylvania 100% 1450 / 1600Gm ST - used (L) cat:32-361
1 6D6 $4.00 National Union 100% 1600 / 1600Gm ST - used (L) --
1 6D6 $4.00 Philco 100% 2000 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Ken-Rad 105% 1800 / 1600Gm ST - used (L) --
1 6D6 $4.00 National Union 105% 2100 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 RCA 120% 2100 / 1600Gm ST - used (L) --
1 6D6 $4.00 Sylvania 120% 2000 / 1600Gm ST - used (L) cat:312-18 - rattle inside
1 6D6 $4.00 Arcturus 105% 2000 / 1600Gm ST - used (L) --
1 6D6 $4.00 RCA / Cunningham 105% 2000 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Tung-Sol 100% 1950 / 1600Gm ST - used (L) --
1 6D6 $4.00 International 100% 1750 / 1600Gm ST - used (L) engraved base
1 6D6 $4.00 Super Silvertone 100% 1800 / 1600Gm ST - used (L) --
1 6D6 $4.00 Marconi 110% 1800 / 1600Gm ST - used (L) --
1 6D6 $4.00 National Union 110% 1850 / 1600Gm ST - used (L) cat:401-166
1 6D6 $4.00 RCA 110% 1950 / 1600Gm ST - used (L) cat:401-139
1 6D6 $2.00 RCA / Cunningham 85% 1500 / 1600Gm ST - used (L) engraved base
1 6D6 $2.00 National Union 90% 2000 / 1600Gm ST - used (L) engraved base
1 6D6 $2.00 Tung-Sol 90% 1500 / 1600Gm ST - used (L) --
1 6D6 $2.00 Hytron 95% 1700 / 1600Gm ST - used (L) engraved base
1 6D6 $2.00 RCA / Cunningham 90% 1600 / 1600Gm ST - used (L) engraved base
1 6D6 $2.00 Super Silvertone 90% 1450 / 1600Gm ST - used (L) --
1 6D6 $2.00 Wards Super Airline 90% 1550 / 1600Gm ST - used (L) --
1 6D6 $2.00 Tung-Sol 90% 1400 / 1600Gm ST - used (L) --
1 6D6 $2.00 RCA 90% 1600 / 1600Gm ST - used (L) --
1 6D6 $2.00 Ken-Rad 90% 1400 / 1600Gm ST - used (L) --
1 6D6 $2.00 RCA / Cunningham 85% 1450 / 1600Gm ST - used (L) engraved base - cat:32-421
1 6D6 $2.00 Super Silvertone 90% 1550 / 1600Gm ST - used (L) --
1 6D6 $2.00 National Union 90% 1750 / 1600Gm ST - used (L) --
1 6D6 $2.00 National Union 90% 1650 / 1600Gm ST - used (L) engraved base
1 6D6 $2.00 RCA 95% 1900 / 1600Gm ST - used (L) US Navy
1 6D6 $2.00 Super Silvertone 90% 1500 / 1600Gm ST - used (L) engraved base
1 6D6 $2.00 RCA / Cunningham 90% 1500 / 1600Gm ST - used (L) engraved base
1 6D6 $2.00 Super Silvertone 95% 2000 / 1600Gm ST - used (L) --
1 6D6 $2.00 National Union 90% 1500 / 1600Gm ST - used (L) --
1 6D6 $2.00 Sylvania 90% 1600 / 1600Gm ST - used (L) --
1 6D6 $2.00 RCA / Cunningham 90% 1600 / 1600Gm ST - used (L) engraved base
1 6D6 $2.00 Ken-Rad 90% 1750 / 1600Gm ST - 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, 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