National / 6414-NATIONAL GOLDLINE CUSTOMER SPECIAL REQUEST 175 VA

6414-NATIONAL GOLDLINE CUSTOMER SPECIAL REQUEST 175 VA 6414-NATIONAL GOLDLINE CUSTOMER SPECIAL REQUEST 175 VA Click on image(s) above to view larger
£18.00

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Single Item

Special Test Request 175 VA

Requested for higher gain

This 6414 was made and tested by Raytheon USA for National Electronics as part of their premium selected Gold line range. This is high grade valve was selected for computer circuits and was used extensively by IBM and the American Military.

The 6414 was only made in the USA and has a 10,000 hour heater rating. The 6414 Raytheon was selected as the factory of choice by National Electronics USA as It is a more ruggedly built, offers long life rating and is made to full military specifications. National Electronics then after a burn in process selected the valves and then marketed them as their premium Gold line range in Gold boxes.

These were tested as a special customer request item as the customer wanted these to be tested with a reduced anode voltage of 175 and not the regular 200 Volts.

At 200 volts, The test plate current is 8 m/A and gain is 5.5 m/Ava. This customer wanted each triode section to be higher than this at a reduced voltage so he would get the items with the higher gain. The customer was manufacturing a Pultec style EQP-1A Equalizer.

Specially Selected for higher gain by using a reduced anode voltage of 175 VA as a special customer request

They also have passed the following tests:

Gain (m/A)
Transconductance (mA/V)
Output Drive Tested
Noise 1 (signal to noise)
Noise 2 (Aural)
Microphonics Test 1(Ambient)
Microphonic Test 2 (Shock)
Cathode Test
Grid Leakage Test

The valves come in the original National Gold line box with the 6414 made in the USA printed on the glass with the test results

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