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

[John Formsma]

If I remember correctly, those adjustments are best made with a
plastic screwdriver (used by electronics repair dudes - used to be
available at Radio Shack).

But, I think you can make the adjustments with a metal screwdriver,
then remove the metal tip from the slot to measure the pitch.

JF

On 7/2/07, terryb <t46xd8jb at xplornet.com> wrote:
>  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: John Formsma To: 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 <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
>
>
>