The E80L valve

kubusi

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This is an enquiry to see if any forum members have made use of this very useful valve in either normal single ended pentode or wired as a triode. Same size as the EL84 but with different pinouts and anode dissipation of 8W.compared to the EL84 which is 12W. A pair of them will put out just over 5 watts audio

It is listed by Phillips as a reliable ruggedized long life valve and in the development stage some parameters were only determined after running continuously for a minimum of 10,000 hours. Other tests done, shock 5 times in 4 positions to an acceleration of 500g. Vibration 32 hours in each of 3 positions to a vibration frequency of 50 Hz at an acceleration of 2.5g.       

The way I see it a small amplifier with built with this valve would virtually last a lifetime unless broken physically, I personally have only used one in the audio output of a much modified communications receiver which  was far from HiFi.

If any forum members have used this valve I would like to hear from them. It is also known under an alternative number 6227 and has gold plated pins.
 

charles

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This is a very interesting valve.

Regarding the E80L. One may even get a higher output (class AB) with an Anode voltage of 250V.  According to the Philips Manual it is 9W.
I agree with kubusi that this is a very robust and a very good audio valve.

I have some but never used it in an audio amplifier.

 
 

kubusi

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Quite correct  Charles with the slightly higher anode dissipation of 9 Watts running at a voltage of 250. I based on the figures I used  a voltage of 200 as reflected in data books I have from Mullard, Pope and Philips. When I used one I ran it at a HT of just about 200 volts and had a maximum audio output of about 2.5 Watts.  Yes and running a pair of them in class  AB should give over 5 Watts audio. Just as an aside I ran another oddball valve in the receiver and :used a 7360 which is a dual beam deflection valve as a RF mixer due to its very low conversion noise

In reply to Den123 as far as I am aware the valve was used in some professional audio equipment that required extremely high reliability, quite possibly also used as you say in aircraft and military where utmost reliability is paramount.
 

charles

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Refer to Philips Electron Tube manual 1963, receiving and picture tubes.

All the Philips special quality valves are listed in this manual.

This is the complete comprehensive one with all the graphs.

It indicates output tables for both 200 V and 250V Va  (class AB two tubes).

As you indicated this is a very good audio valve and it will last a very long time.







 

V4lve Lover

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I have about 50, and ive used them in single ended in the past, you are right, they are an excelent tube, and cheap as chips over here(Holland)

E83F is another tube that i collect, and its Telephone derivative 18042 (18V heater) great little driver in triode mode.

 
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