Welcome in mil_electron_surplus You will be able to find rare and vintage military surplus electronic stuff, The shop will soon be created and supported by our team of well known Ebayers, ham radio operators, diy audio enthousiasts and military telecommunication equipment and tube collectors. We will be able to provide several items in small as well as in large quantities.
THIS AUCTION is about2 pieces of VT-4-C also marked as JAN-CG-211 GE tubes, made in USA
Codes printed on their bases are 73L4 and 73N4 respectively.WE WILL BE TESTING ALL VT-4C TUBES OF OUR STOCK (YES, WE DO HAVE MANY VT-4C's!) AT REAL WORLD CONDITIONS, PLEASE READ BELOW ABOUT OUR TEST SETUPPower supplies Filament
: slow turn on 10VacBias
: Regulated adjustable and metered for V and uA set at –76 VoltsPlate
: HV fully adjustable lab power supply, having overcurrent, overvoltage, overpower protection and meters indicating V, mA and Watts Testing the 2 tubes, numbered as #28 and #29.
We have selected a plate voltage of 1200V
, bias at –67V
and got the following readings #28: 65mA
and #29: 61mA
Then we selected 1000V, same bias at –67V and got approximately 18mA of plate current.
Grid current meter indicated zero during above measurements. Error of our readings was less than +/- 5mA.
External condition of aluminum bases is not perfect possibly due to inspection, insertion in military radios but emission measurements show that both tubes were never really used.
All lettering and logos are readable, please see photos.
SO, THESE TUBES TEST LIKE NEW AND ARE MATCHED!
If you are interested about tube’s behaviour at different plate/bias voltages, feel free to mail us or user : adam2a3 and request another test providing your working points..Shipping
Worldwide shipping cost is flat usd 40.00 including S/H
.We always ship by registered air parcel service, so a tracking nr will be provided.
.Insurance is included per Hellenic Post Office’s roules.
The buyer is responsible for any taxes applied by his country’s customs.
No warranty, item sold as is and as described, no returns accepted.
NO RESERVE, Good Luck!
Items other than the 2 VT-4C tubes shown in photos are not included in this auction.
On 01-Feb-12 at 09:10:42 EST, seller added the following information:
WE ADDED PHOTO OF OUR TEST SETUP.
1200v ADJUSTABLE SWITCHING PS FULLY PROTECTED AND METERED
BIAS REG PS NOT SEEN. DVM SHOWS BIAS VOLTAGE.
SLOW TURN ON FILAMENT PS.