Maybe a stupid, but so far I haven't found any trustworthy answers...
Late 70s and 80 boomboxes here in Europe usually ime with a 5 pin DIN in/out (rec/pb, depending on the pins being used), no Line in our AUX or RCA for that matter.
The only brand I am aware of that uses a resistor on the DIN in (left and right) is JVC...leading to : normal volume on radio and tap hut... Low level on DIN.
I followed the technical manuals, schematics,.. And noticed din directly goes to amp pcb
Hence my question before blowing the amp... Can I put in a trimmer / variable resistor instead of the installed 1/4 watt resistor without taking too much chances of blowing the amp?
As far as I, with my limited knowledge, can see it... All the resistor does is take take the input level down before it goes to the amp... And this works fine when you plug in din to din... But when you plug in RCA to din (Bluetooth adaptor for instance)... You get about half volume, in my opinion due to these resistors beingmade for lower signals and perhaps being over calculated to avoid damage.
PS : by accident I once soldered a normal line level to the wrong side of the resistor and it behaves like when you put a line leven into PHONO input, distorts and such... With "normal" volume.
Hence my question : if I replace those resistors with variable ones (taking care toeqsure them before and putting them to near zero before attaching them), what risks do I take.
Late 70s and 80 boomboxes here in Europe usually ime with a 5 pin DIN in/out (rec/pb, depending on the pins being used), no Line in our AUX or RCA for that matter.
The only brand I am aware of that uses a resistor on the DIN in (left and right) is JVC...leading to : normal volume on radio and tap hut... Low level on DIN.
I followed the technical manuals, schematics,.. And noticed din directly goes to amp pcb
Hence my question before blowing the amp... Can I put in a trimmer / variable resistor instead of the installed 1/4 watt resistor without taking too much chances of blowing the amp?
As far as I, with my limited knowledge, can see it... All the resistor does is take take the input level down before it goes to the amp... And this works fine when you plug in din to din... But when you plug in RCA to din (Bluetooth adaptor for instance)... You get about half volume, in my opinion due to these resistors beingmade for lower signals and perhaps being over calculated to avoid damage.
PS : by accident I once soldered a normal line level to the wrong side of the resistor and it behaves like when you put a line leven into PHONO input, distorts and such... With "normal" volume.
Hence my question : if I replace those resistors with variable ones (taking care toeqsure them before and putting them to near zero before attaching them), what risks do I take.