Yes, Can hear it now, thank you.
That’s not the Pearl, it’s noise from something external, try moving the Pearl chassis away from other things (or vice-versa). Also try engaging the input zobel. (DIP switch #8)
Make sure you have electrical connection between all the chassis panels, that’s a very common way for noise to get into the circuit.
The ferrite will also quite likely help once you get it.
That’s not the Pearl, it’s noise from something external, try moving the Pearl chassis away from other things (or vice-versa). Also try engaging the input zobel. (DIP switch #8)
Make sure you have electrical connection between all the chassis panels, that’s a very common way for noise to get into the circuit.
The ferrite will also quite likely help once you get it.
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with some surface mount JFETs, the gate could use an SMT inductor -- BF862 for sure.
RFI and EMI can migrate via power cords, inter-connects umbilicals etc. An Analog Devices application note mentioned that 1N4148's of the clear variety (they are available as MELF) can be modulated by fluorescent lighting!
RFI and EMI can migrate via power cords, inter-connects umbilicals etc. An Analog Devices application note mentioned that 1N4148's of the clear variety (they are available as MELF) can be modulated by fluorescent lighting!
Hello All,
Not to clutter this thread take a look at the linked thread below about a Bugle clone with 40dB of gain for use with MM cartridges.
I like the results. Just for fun I might hide it in a P-3 enclosure and see if anyone can hear the difference.
Thanks DT
Not to clutter this thread take a look at the linked thread below about a Bugle clone with 40dB of gain for use with MM cartridges.
I like the results. Just for fun I might hide it in a P-3 enclosure and see if anyone can hear the difference.
Thanks DT
Hagerman Bugle 2
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@DualTriode
sneaky... maybe get a friend to do the "packing" so it's "double blind" ;-)
sneaky... maybe get a friend to do the "packing" so it's "double blind" ;-)
When I first got my preamp and Pearl 3 up and running, I had a buzzy hum deep in the background that sounded a little different than BPR's. A few days later my wife mentioned that her computer power supply had quit charging her laptop and through a series of tests had discovered a bad power strip... I turned on the Stereo, on a completely different circuit, btw, and the buzzy hum was gone. It hasn't come back. Check for any inverter type power supplies etc. in your house. Sooner or later you'll find the culprit. Good luck.
Don
Don
I think the Pearl 3 was too close to the wifi mesh router. I moved it farther away and the noise diminished. If I can move it away even farther, I imagine I can get the noise floor even lower. The ferrite clamps may help too once the mouser package arrives. I'll report back once I make these additional changes.
Sam Groner's 60dB LNA uses 4 1N4148's for a 2.4 Volt reference. I covered them with electrical tape.
