Where does this go then? (Philips 555A component) - UK Vintage Radio Repair and Restoration Discussion Forum

SKEXIS1 · 10th Mar 2009, 6:59 pm

I've decided to re-start work on a very tired-looking and previously "got-at" Philips 555A.

There is a lot of work to do; much of the wiring needs replacing, the output
transformer is scrap and someone has changed the original valve line-up.

That said, it's a good challenge and using a replacement O/P transformer I managed to get some sound from it the other day, so I'm pursuing things!

I've removed the main tuning capacitor assembly for cleaning (it was covered in some very unpleasant grease) and came across what I think is "C33" per the trader sheet (724). Take a look at the photo attached.

C33 is the oscillator circuit LW trimmer and has a very low mfd rating (0.00003).

According to the trader sheet, the capacitance of this component is altered by changing the number of windings around the plastic former.

My question is whether the loose end (highlighted in red) actually goes anywhere?

Any help would be welcome!

Thanks

Andy

AC/HL · 10th Mar 2009, 7:25 pm

The short answer is no, it doesn't go anywhere. You just unwind it to reduce the capacitance.

SKEXIS1 · 10th Mar 2009, 7:39 pm

Excellent - thanks for your help!

10th Mar 2009, 6:59 pm	#1
SKEXIS1 Retired Dormant Member Join Date: Sep 2008 Location: Redditch, Worcs, UK Posts: 66	Where does this go then? (Philips 555A component) I've decided to re-start work on a very tired-looking and previously "got-at" Philips 555A. There is a lot of work to do; much of the wiring needs replacing, the output transformer is scrap and someone has changed the original valve line-up. That said, it's a good challenge and using a replacement O/P transformer I managed to get some sound from it the other day, so I'm pursuing things! I've removed the main tuning capacitor assembly for cleaning (it was covered in some very unpleasant grease) and came across what I think is "C33" per the trader sheet (724). Take a look at the photo attached. C33 is the oscillator circuit LW trimmer and has a very low mfd rating (0.00003). According to the trader sheet, the capacitance of this component is altered by changing the number of windings around the plastic former. My question is whether the loose end (highlighted in red) actually goes anywhere? Any help would be welcome! Thanks Andy Attached Thumbnails

10th Mar 2009, 7:25 pm	#2
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: Where does this go then? (Philips 555A component) The short answer is no, it doesn't go anywhere. You just unwind it to reduce the capacitance.

10th Mar 2009, 7:39 pm	#3
SKEXIS1 Retired Dormant Member Join Date: Sep 2008 Location: Redditch, Worcs, UK Posts: 66	Re: Where does this go then? (Philips 555A component) Excellent - thanks for your help!