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6E6P-E spud amp - how it can sound?

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M

MikyK

Member
Joined 2018
#1
Hello guys, I have a 93dB open baffle speakers and momentally a 4P1L PSE amplifier with something like 3.5 watts of output power.
I consider making a little spud amplifier wth the 6E6P-E tube, because I have two 5k 25mA output transformers lying around. What do you think?
I think something like a 1.5w is possible to squeeze out of this tube in triode.
I have read your other guys posts, but how it actually sounds? Can someone describe it in detail?
Thank you very much. Best regards, Michal
 
#4
If I read the 6E6P-E data sheet correctly you might be limited to an anode voltage of 150 volts (I could be wrong). An EL84 might work better if you run it at 300 volts. But at the current limit of your transformer the best you might get is 1 to 1.5 watts.

Anyway, worth a try but don't forget: bass extension = transformer weight (more or less), especially for a SE transformer.

Cheers, S.
 
#6
Steve Morley said:
If I read the 6E6P-E data sheet correctly you might be limited to an anode voltage of 150 volts (I could be wrong). An EL84 might work better if you run it at 300 volts. But at the current limit of your transformer the best you might get is 1 to 1.5 watts.

Anyway, worth a try but don't forget: bass extension = transformer weight (more or less), especially for a SE transformer.

Cheers, S.
Click to expand...
Thanks for reply but nooooo.... I thought the voltage limit will be same as with the 6e5p. I have seen people running them on something like a 230 volts, which was my plan. I wanted to not exceed the 25mA limit on my transformers and to make the dissipation on the tube more by the voltage.... Hmpss... Maybe I can get regular 6e5p or try the luck that I wil not burn the tubes....? 😮
 
#7
Or I can try another thing, but not sure how it will behave. Run anode on 230 volts, becahse this element will withstand it better than the screen grid. And from the anode add zeners in series so the voltage will be always lower than 150 volts Any ideas? Best regards, Michal
 
#8
Have run this tube in triode mode at 270V no problem ever ocurred, the 6e5p up to 285 (Va-k) only with an increase in overal noise in the circuit, or when arriving to 10 Watts total tube dissipation (~3.5K load, 35mA) I don't think they are as wimpy as the datasheet implies, those values are to ensure datashet reliability only, they where very strict with quality issues.
 
#9
I run my 6E6P/6E5P spuds at 200 to 250V on plate. The tubes are cheap, that said I've not run into problems but I don't have thousands of hours on the amps. It's a good sounding tube as a driver and a good spud as well.
Matt
 
#10
I run the 6E5P drivers in my 833C amps in triode mode at 190V and 32mA. They've been running that way for 6 years with no degradation of performance and no bias adjustments needed.

I think the 500 hour lifetime quoted for the 6E5P must be either a misprint or a gross under-rating for very severe conditions.
 
#11
Take a look at current limiting transformers so you can up the plate voltage. These would work as plate chokes. You will get VCA (voltage controlled amplifier) effect from them.

[urlb]https://www.newark.com/c/transformers/current-transformers?turns-ratio=200-5[/urlb]
 
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