loweart
New member
Hi Peeps,
It's been a while since I've used my Crack Amp and I recently connected it up and fired it up to check it was working correctly before loaning it to a friend to listen to and it was working fine for the 30mins that I had it running. I got a call from my friend saying that after he had it on and was listening to it for about an hour, he thought he heard a slight pop and then no sound in one channel ( he didn't mention which channel ). I picked the amp up and confirmed this and I have swapped both the the 12AU7 and the rear 6080 tubes out with other ones and the same thing, no sound from the left channel, no hiss, no hum, no crackles, just dead silent.
I've opened up the case and visually inspected the 2x 100uf 160volt capacitors and could not see any signs of leakage or brown/burn out or bulging. I've also checked the solder joins at the headphone socket and volume pot and also around the tube sockets and nothing loose and I have even touched up the solder joins in these areas.
HOPING someone here can provide some advice/help on how to troubleshoot this further ? Could it be those caps or maybe those 2.49k ohm resistors in headphone socket that's gone bad ?
My Crack is the first edition I believe and the build manual is dated 5/28/10 and I think I bought this kit in 2011 ???? It has worked reliably since it was first assembled by me until this recent incidence and frankly it's had an easy life with only about 800 to 900 hrs of use over the years on a Sennheiser HD600 as it's not my main rig..
Thanks in advance for any help provided in regards to what to look at or what the issue could be ?
It's been a while since I've used my Crack Amp and I recently connected it up and fired it up to check it was working correctly before loaning it to a friend to listen to and it was working fine for the 30mins that I had it running. I got a call from my friend saying that after he had it on and was listening to it for about an hour, he thought he heard a slight pop and then no sound in one channel ( he didn't mention which channel ). I picked the amp up and confirmed this and I have swapped both the the 12AU7 and the rear 6080 tubes out with other ones and the same thing, no sound from the left channel, no hiss, no hum, no crackles, just dead silent.
I've opened up the case and visually inspected the 2x 100uf 160volt capacitors and could not see any signs of leakage or brown/burn out or bulging. I've also checked the solder joins at the headphone socket and volume pot and also around the tube sockets and nothing loose and I have even touched up the solder joins in these areas.
HOPING someone here can provide some advice/help on how to troubleshoot this further ? Could it be those caps or maybe those 2.49k ohm resistors in headphone socket that's gone bad ?
My Crack is the first edition I believe and the build manual is dated 5/28/10 and I think I bought this kit in 2011 ???? It has worked reliably since it was first assembled by me until this recent incidence and frankly it's had an easy life with only about 800 to 900 hrs of use over the years on a Sennheiser HD600 as it's not my main rig..
Thanks in advance for any help provided in regards to what to look at or what the issue could be ?
