8mm Forum: 'Sound' speed on Sankyo 501

This is topic 'Sound' speed on Sankyo 501 in forum 8mm Forum at 8mm Forum.

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Posted by Mike Nicholls (Member # 3576) on August 03, 2014, 03:50 AM:

I have recently acquired a Sankyo Sound-501 Super 8 projector. I noticed when projecting a Laurel & Hardy film that the highly-familiar voices were at too high a pitch. On testing the machine with a timed loop, it appears that the projector is running fast - I suspect at 25fps. Is there any way to adjust the 'sound' speed of this machine? Reference to internet databases confirms that the 501 speeds should be 18 and 24fps. I am capable of dismantling the machine and altering presets on the PCBs if necessary. Any help would be much appreciated.

Posted by Maurice Leakey (Member # 916) on August 03, 2014, 04:32 AM:

Mike
There are two potentiometers (pots) inside each controlling the sound and silent speeds. These can be adjusted using a suitably insulated tool.
Click below for some details on the 600 which I suspect is the same.
http://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=007941# 000000

Posted by Janice Glesser (Member # 2758) on August 03, 2014, 04:39 AM:

Maurice...you beat me to it. I was just getting ready to post the same reference thread [Smile]

Be careful to use a non-metal tool...a wooden letter opener works well...or I just bought a ceramic tip screwdrive.

Posted by Maurice Leakey (Member # 916) on August 03, 2014, 06:59 AM:

Hi, Janice
I badly described the tool as insulated, I knew what I meant, non-metal, but the words didn't come out!
Thanks for the reminder.

Posted by Mike Nicholls (Member # 3576) on August 06, 2014, 01:43 PM:

Many thanks for your answers. I couldn't find any indication that my question had been received in to the forum, so I went exploring. I found the site mentioned but when I opened the 501, nothing looked the same. However, taking the picture as a clue I looked for two pots close to a capacitor and hit the right one first time! It seems my machine was quite a way out, but I managed to get it spot on by making up a 10sec loop with holes punched every 24 frames and projecting it on to a digital stopwatch. I requires very tiny adjustments of the pot to get it absolutely right. I am attaching two pictures showing the speed-adjustment pots. The right-hand pot is the sound speed adjuster (I have marked the PCB 'M' and 'S' for mute and sound). I hope this is of use to someone out there and thanks again for those who took the time to reply. Regards, Mike.

Posted by Maurizio Di Cintio (Member # 144) on August 07, 2014, 05:48 AM:

So the right pot is for 24 fps and the left one for 18, right?

Posted by Mike Nicholls (Member # 3576) on August 07, 2014, 01:26 PM:

That's right, Maurizio, the right-hand one (marked 'S') in the picture alters the sound speed (24fps or 25, or whatever you want!). Although I didn't try it, I assume the left-hand pot (marked 'M' for 'mute') alters the silent speed. This would be very useful info for anyone using this projector for telecine.
Regards,
Mike.

Posted by Janice Glesser (Member # 2758) on August 07, 2014, 01:28 PM:

The "mute" and "sound" labels was confusing to me to Maurizio. I have Super 8 home movie sound films with sound that run a 18fps. So the term "mute" doesn't really apply.

Posted by Maurizio Di Cintio (Member # 144) on August 07, 2014, 04:04 PM:

Right Janice. Thank you guys!!!!

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