Service manual has a number of variable resistors (for bias, dc offset) marked
as semi-fixed.
Had planned to use Borne multiturn VR's but read a post where guy did same
on a Pioneer SA-7800 and the amp ran way too hot, he reverted back to original
and all was well.
How does a semi-fixed behave differently to a VR?
If the VR failed open circuit then it might cause a mess.
Apologies for the dumb question.
as semi-fixed.
Had planned to use Borne multiturn VR's but read a post where guy did same
on a Pioneer SA-7800 and the amp ran way too hot, he reverted back to original
and all was well.
How does a semi-fixed behave differently to a VR?
If the VR failed open circuit then it might cause a mess.
Apologies for the dumb question.
Should have tried gooo..gle,
"There are two general ways in which variable resistors are used. One is the variable resistor which value is easily changed, like the volume adjustment of Radio. The other is semi-fixed resistor that is not meant to be adjusted by anyone but a technician. It is used to adjust the operating condition of the circuit by the technician."
ie, semi-fixed because they are set then remain fixed. Means any trimmer is ok.
Again, apoligies for the dumb question.
"There are two general ways in which variable resistors are used. One is the variable resistor which value is easily changed, like the volume adjustment of Radio. The other is semi-fixed resistor that is not meant to be adjusted by anyone but a technician. It is used to adjust the operating condition of the circuit by the technician."
ie, semi-fixed because they are set then remain fixed. Means any trimmer is ok.
Again, apoligies for the dumb question.
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