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 > -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20070702/2dfb3481/attachment.html
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