Which way is all the way down in this amp?
What reading should I be expecting between c719 - and grkud you
What reading should I be expecting between c719 - and grkud you
Marantz 1070 problems
- Thread starter goldswimmerb
- Start date
petehall347
the brandy coffee man
should be high resistance .
something is drawing too much current .
something is drawing too much current .
petehall347
the brandy coffee man
manual doesn't say which way the trimmers go .. do you have a dbt ?
Not at the moment.
petehall347
the brandy coffee man
best build one first then you can see which way the trimmers work
Alright, so on the left channel I can adjust the bias to 2mv and then it shoots up over 1v...
As soon as I adjust bias on that side or apply a sign it shoots up to 1v+ and I can hear a buzz through speakers, sounds like the amp is oscillating?
petehall347
the brandy coffee man
possibly a bad trimmer or solder joint
Trimmer seems fine with my multimeter ill probably reflow the board
petehall347
the brandy coffee man
could also be a flaky component in the bias circuit
Swapped all transistors and diodes, could it be flakey outputs?
petehall347
the brandy coffee man
could be yes