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Old 23rd May 2009, 08:37 PM   #1
piero7 is offline piero7  Italy
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Smile E80CC aikido

Due I have a lot of Mullard and Philips SQ E80CC I wish to use these tubes with Aikido pre. Is a goog idea to use 4 E80CC or should I use them only on input and 12BH7 on output tube?

Which are the resistances value to change to use E80CC? I did not find anything on tubecad.com, only that they can be mounted and nothing else.

Thanks
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Old 24th May 2009, 04:22 PM   #2
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4 E80CC's would work great in an Aikido line amp. The gain of the Aikido is 1/2 the mu of the input tube, so for the E80CC, roughly 27/2=13.5.

It really depends on how much gain you need; a gain of 13.5 is reasonable for a line stage.

I would start with the R values for the 12AU7 or 6085 and experiment from there, or hopefully one of the experts here will chime in. The Tubecad site may also have the formula/equation(s) needed to calculate the R values, so I would do a search over there (I'm just guessing on this).

My 2 minute web search on the E80CC also mentioned that it pulls more heater current than a 12AU7 so make sure you can supply the heater current. The E80CC also has lower distortion than a 12AU7 so I would try 4x E80CC as well as the combo with the 12BH7 (or some other tubes) and let your ears be the judge.
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Old 24th May 2009, 09:29 PM   #3
Jack C. is offline Jack C.  France
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I built an Aikido with 4 E80CC. I used John Broskie's PCB and I followed his recommandations (I had asked him): for R2, R3, R4, R8, R9, R10, R11 = 300R (TubeCad journal 13 May 2006 "Mono 9-pin Aikido schematic")
Voilą!
Cordialement
J
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Old 25th May 2009, 03:04 PM   #4
piero7 is offline piero7  Italy
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What's your impressions about the E80CC sounds?

Thanks!
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Old 25th May 2009, 04:15 PM   #5
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Piero

The E80CC is a wonderful tube. John Broskie does not have enough of them, you could offer him some

I own some old Studer fader modules, all based on E80CC (and, of course, output trannies). Willy Studer or one (some?) of his engineers seems to know about the advantages of this tubes!

Some kind of overshot, to use such a fine low distortion tube in a circuit like the Aikido, wich cancels the distortion of tubes. Isn't it?

Here some fotos of the fader modules (please note the conventional rotary potentiometer and the fine ball bearing based mechanics converting the linear movement to rotation, working still perfect after more than 50 years!).

Click the image to open in full size.

Click the image to open in full size.

Franz

/Edit

Here the circuit of this module, a line driver module:

Click the image to open in full size.
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Old 25th May 2009, 05:11 PM   #6
piero7 is offline piero7  Italy
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Wow Franz! Very very interesting the tranny output! Can you tell me more about this pre and about the transformers?
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Old 25th May 2009, 05:20 PM   #7
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Piero

I can show you the production datasheet of this trannie, sorry in german language only:

Click the image to open in full size.

I have also the same modules for microphone input:

Click the image to open in full size.

Have fun
Franz
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Old 25th May 2009, 05:40 PM   #8
piero7 is offline piero7  Italy
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Erm erm... can you translate the most important value from german please? My german is very very bad!
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Old 26th May 2009, 05:41 PM   #9
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I am sorry, Piero

My hobby is not translating but Audio.

Please understand.

But it is easy: simple unique words, easily translatable by a translating machine.

Should you not succeed with some words, just drop me a mail and I translate for you, no problem.

Kind regards
Franz
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Old 26th May 2009, 05:44 PM   #10
piero7 is offline piero7  Italy
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Thanks anyway franz, the next step after aikido will be e80cc pre with tranny output
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