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

DonaldStott · 22nd Nov 2020, 11:57 am

The current DAC90A on the bench has a loud buzzing from the speaker even with the volume turned down.

This YouTube link is a short video of the problem - the first half is with the volume turned down and then turned up at about 0:28 : -

https://youtu.be/FetMkUEW6rU

Have I got more than just the usual detached speaker suspension here?

I applied a 1.5V DC source to the speaker terminals to move the cone forward and can see daylight: -

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No problems in reattaching the suspension as there are many Posts giving good advice on this Forum but just concerned about that loud buzzing when the volume is turned down.

There are no other close by EMF sources such as devices with switched-mode power supplies.

22nd Nov 2020, 11:57 am	#1
DonaldStott Octode Join Date: Aug 2015 Location: Glasgow, UK. Posts: 1,842	Bush DAC90A Speaker Problems The current DAC90A on the bench has a loud buzzing from the speaker even with the volume turned down. This YouTube link is a short video of the problem - the first half is with the volume turned down and then turned up at about 0:28 : - https://youtu.be/FetMkUEW6rU Have I got more than just the usual detached speaker suspension here? I applied a 1.5V DC source to the speaker terminals to move the cone forward and can see daylight: - No problems in reattaching the suspension as there are many Posts giving good advice on this Forum but just concerned about that loud buzzing when the volume is turned down. There are no other close by EMF sources such as devices with switched-mode power supplies. __________________ BVWS Member Last edited by DonaldStott; 22nd Nov 2020 at 12:25 pm.