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
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
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.
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.
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!).
Franz
/Edit
Here the circuit of this module, a line driver module:
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!).
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Franz
/Edit
Here the circuit of this module, a line driver module:
An externally hosted image should be here but it was not working when we last tested it.
Piero
I can show you the production datasheet of this trannie, sorry in german language only:
I have also the same modules for microphone input:
Have fun
Franz
I can show you the production datasheet of this trannie, sorry in german language only:
An externally hosted image should be here but it was not working when we last tested it.
I have also the same modules for microphone input:
An externally hosted image should be here but it was not working when we last tested it.
Have fun
Franz
Piero
Another very fine circuit, using a E80CC: Studer 52. A EL84 PP power amp.
The circuit has a kind of Mullard front end, DC coupled.
And a powerstage with cathode feedback over the output trannie.
Look here for the original schematics.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=119189&highlight=
BTW: http://www.roehrentechnik.de/html/gegentakt.html reproduced the output trannie for me (in a 8 Ohm secondary version), based on the original "Bauvorschrift" (the type is 53.1S52).
But with double chamber and better and bigger iron...
My reproduction of this amp is not finished yet :rolleyes
Franz:
Another very fine circuit, using a E80CC: Studer 52. A EL84 PP power amp.
The circuit has a kind of Mullard front end, DC coupled.
And a powerstage with cathode feedback over the output trannie.
Look here for the original schematics.
http://www.diyaudio.com/forums/showthread.php?s=&threadid=119189&highlight=
BTW: http://www.roehrentechnik.de/html/gegentakt.html reproduced the output trannie for me (in a 8 Ohm secondary version), based on the original "Bauvorschrift" (the type is 53.1S52).
But with double chamber and better and bigger iron...
My reproduction of this amp is not finished yet :rolleyes
Franz:
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!).
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Franz
/Edit
Here the circuit of this module, a line driver module:
An externally hosted image should be here but it was not working when we last tested it.
All your links are dead.
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