2. amps-preamps
  3. 191958-170518

Tube power amplifier low static on one channel

Hi all I have an Audio Note Kit EL34 power amplifier. When the music is off I can hear a static sound from the right channel. It is not constant it gets louder then quieter then nothing then back again. I switched the non power tubes right to left and the static stayed on the original channel.  

If it was a tube it would have switched to the other channel correct?

If it was electro interference it would come out of both channels correct? 

Thoughts on what to check next?

Thanks

jh

johnah5
johnah5 OP
235 posts
 

Ah will have it checked.  If the filter cap is good next item?

jh

yogiboy's avatar
yogiboy
5,701 posts
 

Try swapping the power tubes

johnah5 OP
235 posts
 

Ok great idea. I did some research and the sound a bad filter cap makes is a hum. I don't have a hum it is a changing low level static. 

Will do the power tubes and update the post.

jh

blisshifi's avatar
Ag insider logo xs@2x
blisshifi
1,192 posts
 

It could be two other things - 

- Dirty or loose tube sockets. Inspect, tighten and clean the contacts in the tube sockets

- If you have digital electronics adjacent, such as a router, WiFi modem, satellite, etc, that could be causing the static out of just one channel. Make sure anything of that sort is at least 3-5ft away from tube electronics.

Post removed 
More to discover