UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Ted Kendall · 17th Feb 2020, 2:01 am

OK - the short answer is that the TK5 head looks fine and the 819 heads are shot.

The head structure is mostly of brass, with the nose of the polepieces inset - this is the bit in bright metal which you can see on the TK5 head. The whole is potted in the red compound. The polepieces carrying the gap itself are quite shallow to reduce losses, and on the 819 heads these have worn through to the point where the gap as such has gone, leaving the stubs of the polepieces, As a rule of thumb, if you can see the gap with the naked eye on a record or replay head, it is worn out.

17th Feb 2020, 2:01 am	#165
Ted Kendall Dekatron Join Date: Jul 2008 Location: Kington, Herefordshire, UK. Posts: 3,670	Re: Grundig TK 819 Any Useful Info OK - the short answer is that the TK5 head looks fine and the 819 heads are shot. The head structure is mostly of brass, with the nose of the polepieces inset - this is the bit in bright metal which you can see on the TK5 head. The whole is potted in the red compound. The polepieces carrying the gap itself are quite shallow to reduce losses, and on the 819 heads these have worn through to the point where the gap as such has gone, leaving the stubs of the polepieces, As a rule of thumb, if you can see the gap with the naked eye on a record or replay head, it is worn out.