Accufork & pitch reliability - was Acufork II you want to sell?

[terryb]

Jim,

There is a potentiometer that can be accessed when the battery is removed. 
It is has a screwdriver slot. Clockwise increases frequency and  counter 
clockwise decreases frequency.

Terry Beckingham

At 07:52 AM 7/2/2007 -0700, you wrote:
>John,
>
>Do you know how to calibrate the AccuFork II?  I was told that it was a 
>factory only adjustment.  I'd love to do it myself because mine 
>consistantly measures 3-4 cents sharp.
>Jim
>----- Original Message -----
>From: <mailto:formsma at gmail.com>John Formsma
>To: <mailto:pianotech at ptg.org>Pianotech List
>Sent: Sunday, July 01, 2007 3:44 PM
>Subject: Accufork & pitch reliability - was Acufork II you want to sell?
>
>I'm glad someone else brought this up. I think my AccuFork II also has 
>some pitch problems.
>Measurement a couple weeks ago with a friend's RCT showed variation of 0.4 
>cents, measured about five times in about couple minutes. I was taking the 
>RPT tuning exam at Kansas City, and the day before the exam calibrated the 
>AccuFork with the CTE's SAT III.
>
>The next day at the exam, the A4 I had tuned was 1.7 cents sharp. I had 
>checked with both B1 and F2, and was almost completely certain the beats 
>were the same as with the AccuFork.
>
>After the pitch part of the exam was over, I again checked the AccuFork 
>with the same SAT. It was about 0.4 - 0.6 cents sharp, judging from the 
>speed the lights were moving.  We didn't take time to calibrate the 
>AccuFork then; only to move the slider to the place where it was actually 
>A440 as measured by the SAT.
>
>Now, I passed the tuning exam with very high scores, so it was verified 
>that I can hear beats quite well. The only thing I can think of is that 
>the AccuFork pitch drifts, or I just didn't set the A4 pin and string 
>correctly (not very likely).
>
>I don't have an ETD, so it's kind of hard to visually check the AccuFork. 
>Last night, I downloaded a guitar tuner program to my Palm. It showed 
>about the same pitch variation as the RCT.
>
>What device should I trust more? The Palm? Or the AccuFork?
>
>Is there somewhere on the internet that is a totally reliable place to get 
>smack-on A440.00 Hz?  I'd like to figure out the problem, but don't really 
>know which device to begin with. I suppose I could download a trial 
>version of TuneLab, but how would I know it is more precise than the 
>AccuFork? (Do ETDs drift too?)
>
>Yes, yes, I know I'm talking about 0.4 cents at most, so it's not that big 
>of a deal. But I would like to have it within 0.1 cents, if not dead on.
>
>JF
>
>On 7/1/07, terryb <<mailto:t46xd8jb at xplornet.com>t46xd8jb at xplornet.com> 
>wrote:
>Jim,
>
>I have an Accu-Fork II which I purchased several years ago, hoping to use 
>it as a pitch source for the tuning exam. According to my RCT it was 0.43 
>cents flat. If it is left turned on for about one minute, it comes up to 
>pitch. I'll sell it for $75.00 (battery not included). Shipping would be 
>via mail.
>
>Terry Beckingham RPT
>

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