salomonander
Well-known member
- Joined
- Aug 28, 2011
- Messages
- 943
Hey there,
Im calibrating a 1178 and im not certain if my results are ok.
Im talking about the meter calibration and tracking of the gain reduction.
The service manual wants me to feed 0dB 1k sinus and adjust to 5dB of gain reduction on the +4 meter setting. I then have to adjust the meter tracking trimmer to get the same result in the GR setting of the meter. Works just fine and everything under 5dB of gain reduction is shown properly on the meter when comparing the +4 and GR setting.
But when i go above 5dB of gain reduction the tracking goes off. What the +4 setting shows is not exactly what the GR setting is showing. Now i can adjust everything to 10db of gain reduction (as opposed to the 5db) and the tracking gets better in that region. But it then gets worse in the lower settings.
Is this normal? Or am i missing something?
Here is a link to the service manual:
https://thehistoryofrecording.com/Manuals/UREI/UREI-1178_Manual.pdf
Im calibrating a 1178 and im not certain if my results are ok.
Im talking about the meter calibration and tracking of the gain reduction.
The service manual wants me to feed 0dB 1k sinus and adjust to 5dB of gain reduction on the +4 meter setting. I then have to adjust the meter tracking trimmer to get the same result in the GR setting of the meter. Works just fine and everything under 5dB of gain reduction is shown properly on the meter when comparing the +4 and GR setting.
But when i go above 5dB of gain reduction the tracking goes off. What the +4 setting shows is not exactly what the GR setting is showing. Now i can adjust everything to 10db of gain reduction (as opposed to the 5db) and the tracking gets better in that region. But it then gets worse in the lower settings.
Is this normal? Or am i missing something?
Here is a link to the service manual:
https://thehistoryofrecording.com/Manuals/UREI/UREI-1178_Manual.pdf
