And here is the way the work is done in our favorite bass string maker HellerBass in germany. A very kind answer on the subject. I am waiting for other from some factories. Working with only 3 strings at once is a guarantee that a lot of work is used. And the comment that the metal get hop makes sense also. Greetings Isaac OLEG [Photos are at:] https://www.moypiano.com/ptg/files/attachments/75/a9/53/02/36D70011.jpg https://www.moypiano.com/ptg/files/attachments/48/8e/e4/8a/36D70012.jpg https://www.moypiano.com/ptg/files/attachments/d3/cf/53/e4/36D70014.jpg [Alternate URLs:] http://tinyurl.com/gzpa http://tinyurl.com/gzpf http://tinyurl.com/gzpj Entretien et réparation de pianos. PianoTech 17 rue de Choisy 94400 VITRY sur SEINE FRANCE tel : 033 01 47 18 06 98 fax : 033 01 47 18 06 90 cell: 06 60 42 58 77 -----Message d'origine----- De : Hellerbass [mailto:hellerbass@t-online.de] Envoyé : lundi 14 juillet 2003 10:24 Ŕ : oleg-i@wanadoo.fr Objet : AW: A question to the professional ! Dear Isaac! I don´t know the method of Mr. Fenner - sorry ! But we do it in that way you see on the three pics. We need only 30 min for that and not 5 days !!! You have to press the wooden tool against the strings (only three strings - one tone) and pull the tool up and down about four or five times. So the steel become warm or hot and the steel was stretched. It´s hard to explain in English :-) I hope this will help :-) Best regards Gregor www.hellerbass.de -----Ursprüngliche Nachricht----- Von: Isaac OLEG [mailto:oleg-i@wanadoo.fr] Gesendet: Sonntag, 13. Juli 2003 15:12 An: HELLERBASS Betreff: A question to the professional ! Dear Mr Heller, I have heard recently of a pre-stretching method that was eventually described by Mr Klaus Fenner in the 60's, and that is, stretching with groups of four notes, the plain wire, beginning a full major third above, then 17 notes higher a minor third, the, a second, then a minor second, wait for 20 hours, untense, bring to pitch, and go for the next group of four notes. The process is intended to use the most of the plastic deformation of the wire, giving a string that is supposed to be toning better (and which is stable like after a full year of use and tunings). I can't make up my mind to the possible danger (out of going above the breaking strain if the scale is yet high tension, in the treble for instance). I was said we try to be in the top of the linear deformation curve of the string (near the 80% Ultimate tensile strenght), and that, doing so, the metal is hardened like with time, and as the strings are then stable, they are more accepting the bends and kinks because they are now in a more definite place, and not moving back and forth as with the Pitch raising tunings that are due with the most softer methods. If you have some simple fast clue on the goodness of this approach I for sure should appreciate it. If you ever heard of this kind of work as being used in a factory (it takes 5 days to go thru the whole instrument, that does not look like a factory method )or by some masters I will appreciate it as well. I was said that the same result can be obtained with a warming of the strings under some sollicitation and possibly Shimmel is using heat to stabilize the instruments faster. By the way, thanks so much for your strings, they are perfect ! I hope you will find some time to give me a few words on that matter, I thought you should be the good person to ask ! With kind Regards. Isaac OLEG Entretien et réparation de pianos. PianoTech 17 rue de Choisy 94400 VITRY sur SEINE FRANCE tel : 033 01 47 18 06 98 fax : 033 01 47 18 06 90 cell: 06 60 42 58 77
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