I have a fairly new 20th 101B. It has developed an intermittent popping sound on the clean channel. It's barely audible on the blue and red channels too but it's there. I disconnected all cables except the speaker cab and it's still there so I assume it to be tube related. Any insight before I start troubleshooting? Ive already emailed Charley @ Bogner. Thx!
Intermittent Popping on 20th 101B Clean Channel
- Thread starter lkft
- Start date
Charley is great he's the one who told me about using the mute switch to narrow it down. I had a piping noise with a new 2013 xtc and it had jjel34's which is what bogner is using now. The popping was the jj's and charley told me that they do that but it wouldn't be a problem. Good luck
Swapped out the V6 tube as per Charley's recommendation and still have the prob persisting. The prob is a popping sound coming from the clean channel. The standby button on the footcontroler doesn't silence it. On the blue and red channels it's barely audible but still there in the background. It doesn't happen right away, usually takes about 30-45 min to an hour to start popping. It's not a loud pop but then again I don't have much volume at home so I imagine once I get it up to band volume it would be too loud to ignore. Any ideas before I contemplate sending to a tech? Which poses another prob...I have no known, reliable techs here locally (Puerto Rico) so I'll prob have to send it to Bogner in CA which will cost me $600 aprox in shipping. Thx!
EarthRoosterUK
New member
Hi,as the V6 tube(2nd&3rd/gainStage-CleanGreen) is not at fault
,another option is V1 tube(1st/gainStage-allChannels).
One 'half' of V1 handles the Green,the other 'half' for Blue&Red.
Yes, you'd expect ALL channels to have the popping;even more on Blue&Red,
but it is worth checking before shipping.
Also,while the popping is happening, when the volume is turned up&down the noise
will vary accordingly?
If not (i.e. it stays constant in loudness), it's something further along the signal-path;
PowerTubes, or something really random like the SpeakerCable/connections with intermittent contacts
(apologies if you've already been through this stuff already)
....easier to change than internal components & connections ,which unfortunately would be likely.
One other 'easy' thing to check is the channel-switcher on the Back of the Amp;
flick it ,and the other ones,a few times (Low Volume!/footswitch NOT plugged in).
It'll confirm they're properly 'latched'.
Kind Regards,David.
,another option is V1 tube(1st/gainStage-allChannels).
One 'half' of V1 handles the Green,the other 'half' for Blue&Red.
Yes, you'd expect ALL channels to have the popping;even more on Blue&Red,
but it is worth checking before shipping.
Also,while the popping is happening, when the volume is turned up&down the noise
will vary accordingly?
If not (i.e. it stays constant in loudness), it's something further along the signal-path;
PowerTubes, or something really random like the SpeakerCable/connections with intermittent contacts
(apologies if you've already been through this stuff already)
....easier to change than internal components & connections ,which unfortunately would be likely.
One other 'easy' thing to check is the channel-switcher on the Back of the Amp;
flick it ,and the other ones,a few times (Low Volume!/footswitch NOT plugged in).
It'll confirm they're properly 'latched'.
Kind Regards,David.
Thanks for the replies, very helpful! Thinking about the problem has gotten me to believe that it's caused by a bad tone cap in the clean channel preamp ckt. The popping is rather fast and gets faster the longer the amp stays on so I'm going to check that and will report back. Thx!