Bottlehead Forum

General Category => Technical topics => Topic started by: howardnair on December 31, 2013, 12:39:33 AM

Title: soft start in a audionote 300b
Post by: howardnair on December 31, 2013, 12:39:33 AM

thats the question-having arcing problems in the rectifier on startup-this was fixed for 6 mos or so
now it is occurring again-now granted the caps may or maynot  be failing---several remedies have been tried --the amp works and sounds fine but the arcing is not normal and unnerving -what is happening in the rest of the circuits as far as damage to tubes etc-i have not cked start-up voltage yet -it is most likely high but not alarmingly so just enough to give the 5u4g a hard time
schematic is here

http://www.4tubes.com/SCHEMATICS/BY-BRAND/Audio-Note/Kit1/

thanks howie

Title: Re: soft start in a audionote 300b
Post by: Doc B. on December 31, 2013, 08:29:39 AM

It's bad caps or bad tubes. Probably best to ask on the ANkits forum at Audio Asylum.