AVO 7 Mk II Cut-Out Button Replacement Query - UK Vintage Radio Repair and Restoration Discussion Forum

russell_w_b · 22nd Jul 2008, 10:32 pm

I recently acquired an AVO 7 II (1958 vintage) but the domed cut-out button is missing, being broken off in a past life. All that is left protruding is a shaft of bakelite with a metal inner, sitting concentrically in a bakelite sleeve that sits in the cut-out hole (and isremovable from the front).

Is it a difficult job to replace the broken button assembly? A look inside (photo attached) would suggest all it is necessary to do is to trip the cut-out so the shaft is loose, and remove the retaining collet on the end by removing - or loosening - the grub-screw securing the collet to the inner end of the cut-out button.

- Or is there more to the job than meets the eye?

If it is as I think, then, of course, the next question is (and I shall post this bit in the relevant part of the forum!): does any kind soul have a spare cut-out button assembly they are willing to part with?

newlite4 · 23rd Jul 2008, 9:23 am

Hello Russell, I have done loads of these. Simply unscrew the collar, gently push the jewelled lever to the left to release the mechanism and the cut-out shaft will drop out (remember to catch the washers and contact set as the shaft is released). Store the contact set and washers for later reassembly. I wish I still had the stocks of AVO spares but we no longer service them, our fleet of 100 or so AVOs has now been replaced by those rubbery Metrix analog meters

.
Neil

russell_w_b · 23rd Jul 2008, 10:32 am

Quote:

Originally Posted by newlite4

Hello Russell, I have done loads of these. Simply unscrew the collar, gently push the jewelled lever to the left to release the mechanism and the cut-out shaft will drop out (remember to catch the washers and contact set as the shaft is released). Store the contact set and washers for later reassembly. I wish I still had the stocks of AVO spares but we no longer service them, our fleet of 100 or so AVOs has now been replaced by those rubbery Metrix analog meters

.
Neil

Neil,

Many thanks! - Over to the 'wanted' section...

22nd Jul 2008, 10:32 pm	#1
russell_w_b Dekatron Join Date: Jul 2007 Location: Penrith, Cumbria, UK. Posts: 3,687	AVO 7 Mk II Cut-Out Button Replacement Query I recently acquired an AVO 7 II (1958 vintage) but the domed cut-out button is missing, being broken off in a past life. All that is left protruding is a shaft of bakelite with a metal inner, sitting concentrically in a bakelite sleeve that sits in the cut-out hole (and isremovable from the front). Is it a difficult job to replace the broken button assembly? A look inside (photo attached) would suggest all it is necessary to do is to trip the cut-out so the shaft is loose, and remove the retaining collet on the end by removing - or loosening - the grub-screw securing the collet to the inner end of the cut-out button. - Or is there more to the job than meets the eye? If it is as I think, then, of course, the next question is (and I shall post this bit in the relevant part of the forum!): does any kind soul have a spare cut-out button assembly they are willing to part with? Attached Thumbnails __________________ Regds, Russell W. B. G4YLI.

23rd Jul 2008, 9:23 am	#2
newlite4 Octode Join Date: Nov 2003 Location: Bath, Somerset, UK. Posts: 1,805	Re: AVO 7 Mk II Cut-Out Button Replacement Query Hello Russell, I have done loads of these. Simply unscrew the collar, gently push the jewelled lever to the left to release the mechanism and the cut-out shaft will drop out (remember to catch the washers and contact set as the shaft is released). Store the contact set and washers for later reassembly. I wish I still had the stocks of AVO spares but we no longer service them, our fleet of 100 or so AVOs has now been replaced by those rubbery Metrix analog meters . Neil __________________ preserving the recent past, for the distant future.