Simplistic NJFET RIAA is going OK solid as a rock with my EB line amp/headphone amp.
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There is a mystery then? TT plays confirmed, pre-pre measures confirmed, Partridge is a confirmed passive component, Rotel works from MM confirmed, but when you chain TT either from pre-pre or Partridge to Rotel you get nothing. I can't find logic in this. There is something done wrong.
Try to put your scope on your hole amplification chain.
Do you still get a healthy sine wave?
If still yes, then maybe there is either a ground loop or you are missing a ground somewhere.
Do you still get a healthy sine wave?
If still yes, then maybe there is either a ground loop or you are missing a ground somewhere.
In the Low MC pre-pre the signal ground isn't connected to chassis, TT ground is connected to chassis ground.
In the Partridge step-up the TT ground is connected directly to Rotel MM.
In the Partridge step-up the TT ground is connected directly to Rotel MM.
I suspect is a ground loop in the Low MC pre-pre so I will do proper wiring gnd to avoid it.
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Good & bad news.
Good news: channel left is sounding with a big buzz
Bad news: channel right don't sound nothing as is not connected
I reversed the channels at the input Rotel MM and....only sounds always left channel with big buzz so Low MC pre-pre is sounding both channels thi make sense because the same problem was with the step-up combo, I have to wait until I have finished the Itch😡
Good news: channel left is sounding with a big buzz
Bad news: channel right don't sound nothing as is not connected
I reversed the channels at the input Rotel MM and....only sounds always left channel with big buzz so Low MC pre-pre is sounding both channels thi make sense because the same problem was with the step-up combo, I have to wait until I have finished the Itch😡
Something is not connected properly. If you have a sine from the scope you should have music. Maybe post a picture of all the cabling, so if somebody with a sharp eye can help.
For start, I would remove all ground wires from the rca to the chassis and check.
Then one wire from the star of your circuit to the chassis.
These are just suggestions, I would recomend to try various grounding arrangements and see.
Then one wire from the star of your circuit to the chassis.
These are just suggestions, I would recomend to try various grounding arrangements and see.
Why are both input and output gnds tied to the star gnd?
Would it not be better if they were both floating?
Would it not be better if they were both floating?
I have to ground stars one for each channel, have I to connect the two ground stars togheter & after one wire to chassis or have I to connect two wires (one of each channel) to the chassis?