losing volume?

kaibu23 · March 13th, 2004, 01:28 AM

I was at a practice tonight and something was happening, possibly:
my blues junior was losing volume (didn't go past 1 o'clock on either vol) , there was semi-frequent note cancellation, something went on with the pickups, or my 3 week old high e died on me to the point of almost not being able to hear it sometimes....I sounded good for the first 2 hours, turned up and tweaked a little bit and then things went wacky.

Do any of these sound like symptoms of anything to anyone? Or has anyone had similar experiences? This was a first for me in playing with these guys about 15 times. All new JJs 2 months ago.

thanks for anyone's opinions.

Stan Martin · March 13th, 2004, 01:55 PM

parasitic oscillation. although I think you would have had this problem before. have you had any work done recently?

kaibu23 · March 14th, 2004, 01:33 PM

I had no clue about parasitic oscillation....still don't know too much!

The only recent work on the amp was replacing all tubes, including a 12AT7 in place of an AX7 in V3 and some 'cooler' EL84s.

Did some google'ing and found some enlightening reading. I appreciate your help.

March 13th, 2004, 01:28 AM	#1 (permalink)
kaibu23 TDPRI Member Join Date: Dec 2003 Posts: 31	losing volume? I was at a practice tonight and something was happening, possibly: my blues junior was losing volume (didn't go past 1 o'clock on either vol) , there was semi-frequent note cancellation, something went on with the pickups, or my 3 week old high e died on me to the point of almost not being able to hear it sometimes....I sounded good for the first 2 hours, turned up and tweaked a little bit and then things went wacky. Do any of these sound like symptoms of anything to anyone? Or has anyone had similar experiences? This was a first for me in playing with these guys about 15 times. All new JJs 2 months ago. thanks for anyone's opinions.

March 13th, 2004, 01:55 PM	#2 (permalink)
Stan Martin Tele-Holic Join Date: Mar 2003 Location: Pepperell Posts: 818	you may have parasitic oscillation. although I think you would have had this problem before. have you had any work done recently? __________________ http://cdbaby.com/cd/stanmartin3

March 14th, 2004, 01:33 PM	#3 (permalink)
kaibu23 TDPRI Member Join Date: Dec 2003 Posts: 31	thanks Stan I had no clue about parasitic oscillation....still don't know too much! The only recent work on the amp was replacing all tubes, including a 12AT7 in place of an AX7 in V3 and some 'cooler' EL84s. Did some google'ing and found some enlightening reading. I appreciate your help.