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Author
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Topic: Beaulieu Stereo Mag Head Wiring Verification
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Andrew Woodcock
Film God
Posts: 7477
From: Manchester Uk
Registered: Aug 2012
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posted June 23, 2015 08:31 AM
I will be looking to replace my Magnetic Heads shortly on my Beaulieu 708el CD Stereo.
I have already several of these to replace them with.
for those that have done this work and purchased the magnetic heads from Wittners or from other sources, please study the following photographs and let me know please if you can answer my set of questions after the photographs please.
Then an inverted photograph just to give a better view of the points I am raising:-
and now the replacement type heads:-
and another view:-
Looking at my first two photographs it is clear to see that the cable entry into the Woelke 464 Mag Heads is "clustered" or grouped together. The cables then disappear inside the head shell without being able to tell which colour cable goes to which terminal on the magnetic head.
On the new type heads that are fitted to the Bauer Studio Line projectors, the cables go to a plastic socket which just plugs into the terminals on the Magnetic Heads as seen in the last two photographs.
So here are my questions:-
1/ What do the Markings at the end of the Woelke 464 coding stand for or mean?
There are "SA", "RS" "RK" and "R" variants from what I have seen.
2/ The cables are coloured Red, White, Black & Yellow
Please can someone use my lower two photographs to identify which terminal lugs receive each of the coloured cables with the Woelke 464 logo to the front of the magnetic head as fitted?
Any help, as always will be gratefully received thanks.
I would of course, be asking these questions to Wittners also ordinarily but unfortunately they are currently closed while away on holiday.
[ June 25, 2015, 08:20 AM: Message edited by: Andrew Woodcock ]
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"C'mon Baggy..Get with the beat"
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Andrew Woodcock
Film God
Posts: 7477
From: Manchester Uk
Registered: Aug 2012
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posted June 25, 2015 12:58 PM
Thanks Steve, yes I do do this periodically but in this case, it is the beginnings of wear I'm afraid.
I've had these same symptoms on at least two other occasions on these heads and it is typical of what happens on nearly all Stereo Magnetic Super 8 heads, where the balance does wear much quicker than the main just because it is far narrower and therefore has a far smaller overall surface area on the balance track side to the one on the main track 1 side and also as Maurizio points out, the fact that it's close to the drive sprocket on the balance track side.
On these, it does seemingly, take many years of use to manifest but as my machines do get quite a lot of use in a relatively short period of time, it's only to be expected that my machines will need replacement heads and maybe even motors from time to time.
I've been lucky so far however, ive still to change any motors on either of my Bauer machines or the Beaulieu
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Maurizio, do you have the answers to any of the questions above?
Ironically I was running the Bauer briefly this morning and it suddenly struck me that the erase head on the T610's has the same coloured wiring to its head, not the 464's, just the erase head.
From back(main)left to right, to front (balance) left to right, it goes... White, Red, Yellow, Black.
I am hoping this is a standard as the wiring colours are identical and therefore I'm also hoping its the same format as used on the Beaulieu Woelke 464 heads?
Hopefully all will be revealed soon, including information regarding the last letter codes printed on the heads.
[ June 25, 2015, 05:05 PM: Message edited by: Andrew Woodcock ]
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"C'mon Baggy..Get with the beat"
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Phil Murat
Jedi Master Film Handler
Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015
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posted July 25, 2016 01:15 AM
High Andrew,
I have replaced Main Head , a long time ago, 25 Years, on the "Older" Stereo 708, for a one offering same technical feature (BOGEN?) , so what, it was not necessary to make adjustment on the Electronic Sound Card.
In a same operation , I renew the Nylon head skates and I noticed uneven wear for these.
Moreover, I assume it is very important to install new skates associated with a new head as a set ( Like when you replace brake discs on car always with new shoe-pads systematicaly)and controling the contact pressure too.
Also, some Super 8 movies "Low Cost" categories (Hefa, Piccolo,etc...), showing irregular Mag Strip (Liquid Strip Origin ?) are terrible for heads (And film path too).
Did You keep the former head and observed the wear shape with a magnifying lens?
Was the wear slightly offset ?
Let me know......
Phil
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Andrew Woodcock
Film God
Posts: 7477
From: Manchester Uk
Registered: Aug 2012
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posted July 25, 2016 02:19 PM
Hi again Phil.
It's still hanging in there Phil thanks.
It did show symptoms of deterioration on the balance side of the head fairly soon after I got the machine running correctly in the early days, but since, it hasn't gone any worse at all.
I have everything to hand for when the time is right and I will have this head re profiled to extend its life as a spare, but for the meantime, it still performs satisfactory.
I also have,and will obtain more of the vital nylon pressers you speak of.
I agree that both should be changed out when a new head is fitted to ensure the very best contact between stripe and head tracks.
Many of the balance tracks are so narrow when pasted in places and misaligned, I've found you can really only judge the heads performance fairly by using with a known decent recording made on a pre striped stock film to gauge whether or not the balance side of any mag head, is performing adequately, or indeed in need of changing.
I am still unsure of the wiring configuration to each of the four pins on the head, so any help and information on this,I'd be most grateful for Phil to use as reference in the future sometime. ![[Smile]](smile.gif)
Also Phil, I've so far never been able to find out what the different variant lettering on the heads themselves mean.
I.e. SA, Rk, R, RS etc
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"C'mon Baggy..Get with the beat"
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Phil Murat
Jedi Master Film Handler
Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015
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posted August 24, 2017 09:25 AM
Hello Andrew,
Even if the theorie for Mag Head is quite simple (Coil plus air-gap), the only thing I know is during "playing" this is a Voltage fluctuation which is traduced.
During "Recording" this a current fluctuation which is traduced....
Then a Mag Head dedicated to "play" only can have different performances than a Mag Head which is used for "play & Record".
A "play & record" head is a compromise design.
May be this is the reason why "Woelke" references are FK464R for "Monitoring" and FK464RK for "Play & Record".
Anyway as this is Super 8 (this is not HIFI), and I assume both head are interchangeable.
May be using "Monitoring" head in place of a "Play & Record" head leads to a loss of signal power during "Recording"
If this is the case, that could mean during playing the signal level could be higher than a "Play & record Head" (To be confirm by an Audio specialist.....)
I have already replaced the "Play/Record" head during the 80/90.(The 1st Beaulieu I have bought as a 2nd hand machine ,had played one movie feature a day for 2 years !!)
I bought interchangeable items (BOGGEN ??) from a small compagny specialized in Mag heads for any systems (cinema, audio, computers, etc....). So what I installed is a bit different from genuine one, but i can't ear any differences at this time.
Concerning wires colours (for my new head):
First set (RED/BLACK) is for main track
Second set (BROWN/GREEN) is for small track
BLACK & BROWN are supposed to be connected to ground.
For FK464, Yellow and White are connected to the ground.
[ August 25, 2017, 06:44 AM: Message edited by: Phil Murat ]
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