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Old 24th January 2005, 05:20 PM   #1
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Question What to do with ECC88's?

Hello there!

Sorry i haven't made any introduction yet, but i'm a bit anxious about this first post.

What simple circuits are recommended for the ECC88/6DJ8, as i have around 4 of them and 3 PCC88?
I have very little experience with tubes and would like to avoid complicated circuits, as i don't also have access to real output trannies.

Many thanks to all, hoping to be a regular poster too.
Cheers!
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Old 24th January 2005, 11:10 PM   #2
SHiFTY is offline SHiFTY  New Zealand
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A simple line level preamp could be made- try a google search...
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Old 24th January 2005, 11:28 PM   #3
SY is offline SY  United States
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These are small-signal tubes suitable for pre-amp use. Don't worry about output transformers!
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Old 25th January 2005, 04:24 AM   #4
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Heck, you can use them for output too. Join me in owning a MP (massively parallel) amplifier.

Although with only four, you'd be better off using them for gain, line or driver stages. A lot of neat things can be done with these types as they can pull pretty good current, for a recieving tube.

Tim
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Old 25th January 2005, 03:00 PM   #5
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4xECC88 could make a nice headphone amplifier for 300 Ohms or higher headphones. I posted a schematic recently..

SRPP headphoneamp with E88CC

Jakob E.
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Old 25th January 2005, 03:12 PM   #6
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Quote:
What simple circuits are recommended for the ECC88/6DJ8, as i have around 4 of them
This immediately came to mind

The original circuit (Aikido):
http://www.tubecad.com/2004/blog0011.htm

Aikido variations :
http://www.tubecad.com/2004/blog0013.htm


More Aikido :
http://www.tubecad.com/2004/blog0016.htm#MoreAikido

Aikido Revisited :
http://www.tubecad.com/2005/January/blog0030.htm

And finally where one person sends his distortion results in (With all ECC88)
http://www.tubecad.com/2005/January/blog0032.htm

Happy reading!

Don't worry about the "complexity" if you decide to go this way...you'll get plenty support from here!

ps..I'm building on myself just for fun...and to see how it sounds..

Cheers,
Bas
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Old 25th January 2005, 07:40 PM   #7
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I'm making a super simple PL504 amp for my PC speakers, after a circuit by Mr. Burkhard Kainka, just some 4 resistors per channel, but i have no will to complete it, i'm just so "soft".

But the aikido looks neat!
I also have a 6X4 rectifier, maybe i'll give it some use on the PS.

Thank you guys!
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Old 27th January 2005, 12:41 PM   #8
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Default regarding the Aikido

Bas, could you detail a little more about the Aikido?

It's seems to me that only the cathode resistors need to be changed/tweaked to suit a certain tube family, with the potencial divider resistors needing only to be equal, with a wide variation in their value.
Am I right?

cheers!
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Old 27th January 2005, 12:45 PM   #9
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Quote:
It's seems to me that only the cathode resistors need to be changed/tweaked to suit a certain tube family
You are dead right!

Ofcourse you might have to change pinout for different families...but that is logical..

I've drilled some holes in a wooden plank hopefully I will start building some time next week... :-)

Cheers,
Bas
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Old 27th January 2005, 07:23 PM   #10
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Quote:
These are small-signal tubes suitable for pre-amp use.
Hi tzere...
They're were also in UHF tv tuners..........a lovely little hi slope tube, I use 'em in parallelled cathode follower config with 3:1 step down parafeed tranny to 600 ohm /o/p's ...With anode tied to B+ supply it will need close decoupling caps on the anode sock pins 1,6 otherwise it can oscillate with langky wiring....also use 10K grid stoppers.

rich
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