UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Leak Stereo 20 and TL12 Plus in need of recommissioning. Help and Guidance needed.

Radio Wrangler · 5th Dec 2017, 12:25 am

The amplabs stereo 20 webpage seems quite sensible, but with one exception. 1N4007 are very slow diodes because of how their high voltage rating is achieved. They turn off late and with a snap which creates strong RF interference. It is most counter-intuitive, but higher speed rectifiers create lass noise. I'd go for a better diode in any HT power supply. in this case, the GZ34 may be doing all the work and cutting off before 1N4007, but that type is best avoided.

David

5th Dec 2017, 12:25 am	#30
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,902	Re: Leak Stereo 20 and TL12 Plus in need of recommissioning. Help and Guidance needed The amplabs stereo 20 webpage seems quite sensible, but with one exception. 1N4007 are very slow diodes because of how their high voltage rating is achieved. They turn off late and with a snap which creates strong RF interference. It is most counter-intuitive, but higher speed rectifiers create lass noise. I'd go for a better diode in any HT power supply. in this case, the GZ34 may be doing all the work and cutting off before 1N4007, but that type is best avoided. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done