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

DMcMahon · 27th May 2020, 3:57 pm

Based upon my own personal R2R experience, I consider that normally one would be unlucky to damage heads/make them go open circuit by testing their continuity, particularly when using digital test meters.

Having said that, last year when working on one of my Uher Royal de Luxe diagnosing a dead left channel, found that the left channel of the head was open circuit. The right channel worked OK and the head measured good continuity but a relatively short time later the right channel died and the head was then found to be open circuit.

These were Bogen heads which have a reputation for suddenly dying, so I do not really think that me testing its continuity led to its later failure.

Personally I have not experienced (nothing obvious anyway) the sound degradation of a magnetised head after head continuity checks.

27th May 2020, 3:57 pm	#45
DMcMahon Dekatron Join Date: Apr 2019 Location: Worthing, West Sussex, UK. Posts: 6,603	Re: Grundig TK245 overhaul Based upon my own personal R2R experience, I consider that normally one would be unlucky to damage heads/make them go open circuit by testing their continuity, particularly when using digital test meters. Having said that, last year when working on one of my Uher Royal de Luxe diagnosing a dead left channel, found that the left channel of the head was open circuit. The right channel worked OK and the head measured good continuity but a relatively short time later the right channel died and the head was then found to be open circuit. These were Bogen heads which have a reputation for suddenly dying, so I do not really think that me testing its continuity led to its later failure. Personally I have not experienced (nothing obvious anyway) the sound degradation of a magnetised head after head continuity checks.