- Joined
- May 14, 2014
- Messages
- 2,330
- Location
- Southwest Kootenays BC
- Tagline
- No such things as bad days, just bad moments
Thought I'd get it over with and post again albeit about a problem with a different piece of gear. What's giving me grief now is a 3300 Series II preamp beautifully reconstructed by Lee for Lyle which was whom I purchased it from.
A loose connection in the newly White Oaked 700B (also beautifully done, performed by Jerry) had me convinced there was a problem with my preamp so I bought another one, coincidently a 3300 II Lyle got back from Lee and it worked great. When the problem that made me suspect my first preamp occurred again, I realized the 700B was to blame. While assessing it I took the preamp out of the system and used the variable out of a CD player.
After that problem was identified and fixed, I started reconnecting the 3300 Series II. In so doing, I neglected to turn off the power amp and when reconnecting it, the centre pin of an interconnect to the power amp touched ground, causing a loud hum for the fraction of a second it was in contact. The speaker was not damaged. I cannot comprehend why that would affect the preamp, but it no longer has any output from either set of main out RCA's or from the headphone jack. I've used a good source plugged into several inputs but it's dead. There is also no residual noise which there once was with the volume control up full.
It's not handy at the moment, but if I recall the block diagram on the preamp's top cover, a
line amp seems to be directly in the signal path from any input. I am completely unfamiliar with op amps but could that be the most likely culprit?
A loose connection in the newly White Oaked 700B (also beautifully done, performed by Jerry) had me convinced there was a problem with my preamp so I bought another one, coincidently a 3300 II Lyle got back from Lee and it worked great. When the problem that made me suspect my first preamp occurred again, I realized the 700B was to blame. While assessing it I took the preamp out of the system and used the variable out of a CD player.
After that problem was identified and fixed, I started reconnecting the 3300 Series II. In so doing, I neglected to turn off the power amp and when reconnecting it, the centre pin of an interconnect to the power amp touched ground, causing a loud hum for the fraction of a second it was in contact. The speaker was not damaged. I cannot comprehend why that would affect the preamp, but it no longer has any output from either set of main out RCA's or from the headphone jack. I've used a good source plugged into several inputs but it's dead. There is also no residual noise which there once was with the volume control up full.
It's not handy at the moment, but if I recall the block diagram on the preamp's top cover, a
line amp seems to be directly in the signal path from any input. I am completely unfamiliar with op amps but could that be the most likely culprit?
