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Author
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Topic: Help Required with Son 9.9mm low sound
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Allen Nunneley
Junior
Posts: 8
From: Mullion Cove, Cornwall, UK
Registered: Feb 2016
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posted May 05, 2016 03:52 PM
Good evening gentlemen from a sunny Mullion Cove Cornwall.
I have owned a Son 9.5 since 1967, it ran ok apart from the motor seizing up now and then.
The sound was fine in the 1967s the last time I used a sound film.
A few weeks ago I purchased three motors on eBay, one a Gem motor looked almost new as the commutator had no sign of wear.
The only difference between the Son and Gem motor is the governor for the sound speed, I had wired the governor our years ago on my Son.
To help protect the new motor I drilled two 1/16 holes through the case of the projector, then through the motor casting then the bearing to the spindle.
I used the centre of a VHF coaxial plug as a tube through the motor casting into the bearing.
By taking out the lamp and cover I can see to line thing up, it is now a simple matter lubricate the front and rear motor bearings using a syringe.
I had managed to damage the HT rectifier valve when removing the chassis, so decided to re-cap it as after fitting a new one a check with a meter revelled DC on the grid of the 6v6.
I have now replaced all the capacitors and the amp has plenty of gain, the optical sound though is very low.
The adjuster for the sound lamp alignment does peak, I had when re-fitting the chassis reversed the leads to the Cintel GS 52 photo electric cell, I had not tried the sound before doing this.
With the leads round the right way the sound is low, taking the photo call cover off and flashing a torch at it produces plenty of noise.
The alignment of the lamp in the base looks OK, however the tube that extends from the photo cell cover to the sound drum has what appears to be a transparent plastic tube inside, it is not clear it is brown in colour.
Could any owner of a son undo the three screws that hold the photo cell cover and have a look to see if the plastic in the tube should be clear ?
I have located a photo cell on eBay which is on its way, but it is not known if it is new.
Thank you for your time.
God Bless Allen
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