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

Keith · 28th Jul 2009, 9:29 am

Hi,

One common fault on FM is the deterioration of the electrolytic capacitor (positive to ground) across the ratio detector transformer. This usually gives distorted audio. The IFT's don't need to have a high Q for FM - in fact a common mod is to damp them with resistors to cater for the wider deviation on current FM transmissions. When sorted the VHF61/62 can sound pretty good on FM - I use mine daily.

Good luck

Keith
http://tibblestone.users.btopenworld.com/Bush_VHF62.htm

28th Jul 2009, 9:29 am	#8
Keith Heptode Join Date: Jan 2003 Location: Tewkesbury, Gloucestershire, UK. Posts: 693	Re: Bush VHF61 Quiet on VHF Hi, One common fault on FM is the deterioration of the electrolytic capacitor (positive to ground) across the ratio detector transformer. This usually gives distorted audio. The IFT's don't need to have a high Q for FM - in fact a common mod is to damp them with resistors to cater for the wider deviation on current FM transmissions. When sorted the VHF61/62 can sound pretty good on FM - I use mine daily. Good luck Keith http://tibblestone.users.btopenworld.com/Bush_VHF62.htm