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Old 14th October 2004, 01:15 PM   #1
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Default Found some EC8010

Hi all,
Just found a pair EC8010 tubes on a hamradio exchange market
At the pins I can see they are used, they look ok though.
I haven't tested them yet, hope they are ok.....

Did a search on this forum and got lots of threads with EC8010 in them, but they all appeared to be someones nick

Found data sheets plenty, but like to know what was their intended use and in which diy-circuits they excell.....

On the bottom of the tubes is a '6' in the glass and on top one tube is the code 529, the other says 536

Any further info on these tubes would be great
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File Type: jpg ec8010.jpg (88.0 KB, 576 views)
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Old 14th October 2004, 01:41 PM   #2
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Looks like a good general-purpose tube

That open construction will look funky!

Here's some examples I Googled:
http://www.wdehaan.demon.nl/mono/mono/56872.html
http://www.vt52.com/diy/myprojects/amps/lcr/lcr.htm
http://www.vt52.com/diy/myprojects/a...e/epilogue.htm

And more!
http://www.google.ca/search?num=30&h...er&btnG=Search
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Old 14th October 2004, 07:39 PM   #3
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Hey Geek,
Thanks for your reply, btw. interesting website you got. Spent some time reading stuff....

Saw some GM70 and 300B amps using EC8010 as drivertube, but has anyone experience with EC8010 as small signal amplifier tube especially concerning microphonics?
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Old 15th October 2004, 04:45 AM   #4
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I have personally found microphoniciness of a tube particular to brand of the tube. Not with the 8010 specifically, but all tubes in general. Sylvania for example, have one of the nicest tones, but all are microphonic (even a Sylvania 7025 I have is microphonic), while some other lesser-known-to-audiophile brands, like Rogers, sound "darker" than the rest, but you can tap them with a screwdriver all day and not hear one "ping".

The moral of the story is....make a test jig and try it.

My test jig consists of a breadboard where I bias the tube, usually 100K on the anode, 1K on the cathode bypassed with 10uF, ground the grid, run the anode through a 0.01uF cap out to your soundcard line input. This can be used to measure noise and microphonics.
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Old 20th October 2004, 11:48 PM   #5
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WOT preamp
search for "Choky's wot preamp" here or with google
or just search for "Euridice" preamp
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Old 21st October 2004, 01:52 AM   #6
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Hi,

Quote:
Found data sheets plenty, but like to know what was their intended use and in which diy-circuits they excell.....
If you look at the TFK datasheets it should be rather obvious to see what these tubes were designed for.
Nonetheless they should be great in audio apps where you'd want both low noise and high gain.

Phonopreamps, microphone pres and MC headamp stages come to mind.

Given the tightly clamped build microphony should not be an issue unless you hit a really bad batch of tubes.

Cheers,
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Old 21st October 2004, 11:38 AM   #7
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found it ;
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File Type: zip choky's wot.zip (9.6 KB, 123 views)
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Old 21st October 2004, 07:42 PM   #8
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Geek, choky and Frank,

Thanks all for your replies

So these tubes could come in my next phono preamp ( now i use 12ax7's, with a ecl85-0a2 series regulator for each channel for that )

Currently i'm working on a 6c33 circlotron otl, that one gets my full attention first. Takes a lot of time though, since i'm not an electronics scolar at all. But great satisfaction when i get something to work properly

Bye
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Old 21st October 2004, 10:12 PM   #9
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yep-when I manage to stash enough 8010 and/or 8020,I'll start to make my new LR EQ phono stage with lotsa iron and those quties
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Old 21st October 2004, 10:27 PM   #10
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Hi,

Quote:
So these tubes could come in my next phono preamp ( now i use 12ax7's, with a ecl85-0a2 series regulator for each channel for that )
Hmmm....I'm always interested in seeing the schematic of that preamp if you have it...

Quote:
Currently i'm working on a 6c33 circlotron otl, that one gets my full attention first.
There's a thread here entitled "OTL" in case you're interested.
What's the target poweroutput for that amplifier?

Cheers,
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