NOS EL84 (6BQ5) Tungsram matched quadrate vacuum tubes

We have NOS EL84 (6BQ5) Tungsram matched quadrate vacuum tubes.

EL84,6BQ5,vacuum tubes
 

Freckles on the tube side are not burns,
but they are magnesium fall-outs originated during manufacturing.

EL84,6BQ5,vacuum tubes


Made by Tungsram (Hungary).
Packing : OEM.

(The 100 pieces packing set in the picture is only a sample, demo).

The  NOS EL84 (6BQ5) Tungsram vacuum tubes have been checked

by a calibrated Hickok 539B vacuum tube tester.


 

By the operating manual of the tester the typical value
of the MC (Mutual Conductance) of the NEW
EL84 (6BQ5) vacuum tube is : 8.475.
This is taken as 100 %.
On each tube I placed a little white sticker with the measurement results.

MUTUAL CONDUCTANCE TEST: here we can get exact
numerical value in micromhos.
The condition of TUT (Tube Under Test) can be expressed in percent.
For example : in case of NEW
EL84 (6BQ5) the listed typical
value of mutual conductance is 8.475 micromhos.
If the TUT has 11.000, the percental condition is
(11.000 / 8.475) x 100 %  =  130 %.

Result of the mutual conductance test, as follows :

No

MC

Price Euro

Date Codes

Comment

Photos

001

11.000 = 130 %

125,00 Euro / quadrate

SOLD

"R8" = May 1971 + serial number

 

Matched quadrate
(4 pieces) set

 

Photo - 1

Photo - 2

Photo - 3

Photo - 4

002

11.000 = 130 %

"HN0" = June 1972  + serial number

003

11.000 = 130 %

"7I" = Sept. 1970  + serial number

004

11.000 = 130 %

"HNO" = June 1972 + serial number


No

MC

Price Euro

Date Codes

Comment

Photos

005

11.000 = 130 %

125,00 Euro / quadrate

SOLD

"650" = Febr. 1977  + serial number

 

Matched quadrate
(4 pieces) set

 

Photo - 1

Photo - 2

Photo - 3

Photo - 4

006

11.000 = 130 %

"45" = Non. 1977  + serial number

007

11.000 = 130 %

"??" = ?????????  + serial number

008

11.000 = 130 %

"650" = Febr. 1977  + serial number

TERMS:

Each tube has been packaged in two layers by use of air insulating
wrapping paper.
So packaged tubes are housed in an international standard size box.
We use foam inside the box to preserve the tubes against bumps.

Method of payment is : Euro or USD.

Paying method :

- per PayPal,
- per Bank Transferring,
- per Western Union Money Order.


If you have any questions , I will answer as quick as possible.

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Thanks for visiting.

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Last update : 2013. május 17. 23:50