[pianotech] ETD tuning during temperature changes

[John Ross]

I always wondered about that 2c claim.
As far as I can tell, the 2c would be only one note, others would be up and down from that.
I do notice at the university, when tuning at the start of the term, having tuned the previous January, that it can be about 1/3 ST high, but just above the break.
Everything else is a different amount.
Anyway, thanks for trying to enlighten this old brain, which is too slow, to grasp the concept.
I always did try to oversimplify. LOL
John Ross,
Windsor, Nova Scotia

On 2011-01-27, at 1:56 PM, Ron Nossaman wrote:

> On 1/27/2011 10:32 AM, John Ross wrote:
>> When using a machine, you are using the same standard across the piano,
>> so any movement of an area is of no consequence.
> 
> Hi John,
> Well, no, that's the problem, and I expect why JF asked. I've wondered about the same thing for a long time, but never asked because I never expected to get an answer that made any sense. The accurate standard is, in this case the problem. Tuning aurally, as the heat cycles on you're tuning one pitch shifted string against another pitch shifted string, so when the heat cycles off and the strings cool, they should theoretically maintain a fairly close relationship one to the other. Tuning a pitch shifted string to a non shifted ETD reference should leave the string farther from those tuned before the heat cycled than the aural tuning.
> 
> 
>> If doing a pitch raise aurally, when you go to use a note previously
>> tuned, it will have changed, from where you had originally put it. So
>> your reference is now off.
> 
> That's a pitch raise, which is an entirely different set of problems. JF asked about the short term pitch swings that happen during the course of a fine tuning, already at pitch, as the heat cycles on and off.
> 
> 
>> Oh yes and for those that do a pitch raise for 2 cents off, (which is
>> ridiculous) how do you do it aurally with any accuracy?
>> John Ross
> 
> They don't. It's like the comment I made about the difference between analog and digital watches. The only folks talking about an extra pitch correction pass for two cents are ETD users. I personally, would be absolutely thrilled to find a piano I was to tune anywhere near two cents off. I'd assume it was a "calendar" tuning, rather than anything they heard. Maybe that'll actually happen some day and I'll ask.
> 
> Ron N

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