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Old 15th Jun 2022, 1:36 pm   #1
JanWra1
Tetrode
 
Join Date: Jan 2018
Location: Stockholm, Sweden
Posts: 78
Default Plessey PR155 Audio output problem

Hi Guys

I have got my hands on a very nice Plessey PR155, however it has a problem with Audio output. The radio has 2 Audio amplifiers in Module 9: One is feeding the internal speaker and the headphones (board A)and the other (board B) is feeding the line outputs inkl an external 600 Ω speaker.
At first I had problems with both A and B but A was solved by replacing capacitor C1 on board A.
The problem with B remains - i.e. very low output. have checked all capacitors which were OK, At the input to B is a variable potentiometer RV1 and adjusting it will change the output slightly.

Is anyone familiar with the Plessey PR155 and able to give a hint of what the problem may be? Any advise will be appreciated.

73 Jan / SM5MRQ
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