Bottlehead Forum

Bottlehead Kits => Kaiju Stereo 300B amp => Topic started by: pfontana on April 23, 2020, 12:21:53 PM

Title: buzz in left channel [resolved]
Post by: pfontana on April 23, 2020, 12:21:53 PM

Hi,
I finished my Kaiju around a month ago.  It's been working great... until now.
I have a left channel 60Hz hum almost all the time.  Once in a while it goes away and stays away.
I've only attached my left speaker cable and disconnected everything else.  The right channel works great.
My initial hum pot measurements were 5mv.
Any ideas?
thanks,
Philip

Title: Re: buzz in left channel
Post by: Paul Birkeland on April 23, 2020, 12:24:46 PM

Do you have the DC filament upgrade? 

Can you listen to a 120Hz and 60Hz tone on YouTube and tell us which you hear?

5mV on the speaker posts without the DC filament upgrade wouldn't be abnormal.

Title: Re: buzz in left channel
Post by: pfontana on April 27, 2020, 07:02:54 PM

Hi,
After inspecting the amp, I re-soldered a few spots on the left channel.  It fully took care of the hum.  I'll let you know if it comes back.  And I have the DC filament but haven't installed it yet.  I thought I'd get used the standard amp first for awhile.
Thanks,
Philip