7L12: advice please


I've been given a 7L12 to renovate. It does show many signs of life, as the frequency scan is accurate, and the cal signal looks the right shape, but as far as I can see, it's about 12 to 15dB insensitive / down in amplitude, with a commensurately high noise floor.

The input attenuator seems to step the signal in 10dB steps, and nothing is loose inside. However, it looks like a nightmare to get this unit apart to have a good look at the central board assembly? Is there an elegant way in?



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