EAF801

HALLO MEMBERS ! Is there any Substitution for the EAF801? What is the American equivalent? how can i test this tube with my TV-7/U tube tester? email me at : trihordo@hotmail.com Any help will greatly appreciated ! Spiros Hellas

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Hallo Spiros,

 

there is no American equivalent to this tube.

As a makeshift, you can substitute the EAF801 by an EBF89. The EBF89 contains additionally to its penthode unit 2 diode units, where the EAF801 has only 1 diode.

 

The internal shield of the EAF801 is lead out to a separate pin to be connected to ground. Though the internal shield of the EBF89 is connected to cathode internally.

 

Since the cathode of the EAF801 may not be at ground potential in its normal circuit, replacing the EAF801 by an EBF89 may detoriate the performance of the receiver. If the performance is still sufficient, you can leave the EBF89.

 

BR, Jacob

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Hello Mr. Hellas ,

 

So far as I know, there is no American equivalent for the EAF 801 available

 

Go ahead and test this valve as follow:

Pentode

V heater 6,3 V AC

V Plate + 200 V DC

V Grid 1       zero V

V Grid 2 + 60 V  DC

 

Plate currency > 7 mA should be good

 

Diode

 

V Plate  10 V  AC

 

Plate currency > O,3 mA should be good

 

I hope it will help you.

I wish you a great success

 

Best regards  from the Black Forest  Wolfram Zylka

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hallo mr Jacob! thank you very much for the help! best regards Spiros

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hallo mr Wolfram ! thank you very much for the time to help me with the EAF801. i will try to test the tube that way later on. best regards Spiros

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Several times, I found EAF801 which had internal shorts or built up a poor isolation between grid and cathode. Those shorts usually occured within the diode section and were intermittent - take a screwdriver and knock the tube from different sides while the set is switched on. If it suddenly plays, you know what's up...
The poor isolation will generate a nasty scratchy sound and / or make the volume change heavily while tapping it. ---
Did you check the voltages applied to the tube within the set ? Due to mad screen / plate resistors, those voltages sometimes are too low.
Also check your tube for gas. A gassy tube will draw currents much higher than it should. But that will not happen with the grid bound to ground ! So, connect the grid across 1MegOhm to GND. Take a current reading. Afterwards, connect it to GND directly. The plate current must not be remarkably lower now, but it may be a bit higher now.

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Yes i do. Please give him my email to contact me. Thank you.

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