No more 60 Hz hum in a PL2000 preamp.
- Thread starter George S.
- Start date
It's back in the system running on the original transformer. It's very quiet with no hum. But it's lost the punch and bass definition it had with the Hammond transformer.
The difference is really noticable. These preamps definitely need a larger transformer.
Going to finish listening to side 2 of the album. Then download the datasheet for the Antek, and make some paper cutouts to make sure it'll fit.
12 deg F. outside, turned on the 8 Lava Lamps to heat up the room some. It'll probably take about 4 hours for the big one to get going.
The difference is really noticable. These preamps definitely need a larger transformer.
Going to finish listening to side 2 of the album. Then download the datasheet for the Antek, and make some paper cutouts to make sure it'll fit.
12 deg F. outside, turned on the 8 Lava Lamps to heat up the room some. It'll probably take about 4 hours for the big one to get going.
I'm cheap so I just remove the offender from the area...
The phono preamp has been successfully built MANY times with the switch mode PS right next to the amp boards, but I moved mine out anyway.
In that case the "filter board" was specifically designed and tailored to filter that specific power supply. The filter board I mounted in the main cabinet, but the A/C line filter and SMPS were outboard, with low voltage DC going up to the main cabinet only, into the filter board (tucked in a corner inside a steel box) and then onward to the power switch and amp boards.
The phono preamp has been successfully built MANY times with the switch mode PS right next to the amp boards, but I moved mine out anyway.
In that case the "filter board" was specifically designed and tailored to filter that specific power supply. The filter board I mounted in the main cabinet, but the A/C line filter and SMPS were outboard, with low voltage DC going up to the main cabinet only, into the filter board (tucked in a corner inside a steel box) and then onward to the power switch and amp boards.
Jim BC, I do have a good size sheet of mumetal left over from a past project, but that cover is the bomb. Going to open up a preamp and find a cover that fits. My mumetal has adhesive on it, so I can always stick it on the cover if needed. Thanks! I will have to revisit the rules for bonding mumetal to ground if it's needed.
Well, the cover for the AN-0212 transformer is a CA-002. Not listed on the website, but it is in their eBay store. Too big, won't fit the available room in the chassis. None the less, I have two of those 25VA on the way.
The next smaller size is the AN-0112, a 10VA unit. This one takes a CA-001 cover which will fit the available space.
So, also ordered the smaller units and covers.
We'll see how this sorts out once the stuff arrives and I can get to it.
Lee once said "We need a great sounding PL preamp".
That's the goal.
The next smaller size is the AN-0112, a 10VA unit. This one takes a CA-001 cover which will fit the available space.
So, also ordered the smaller units and covers.
We'll see how this sorts out once the stuff arrives and I can get to it.
Lee once said "We need a great sounding PL preamp".
That's the goal.
I started to clone a Acurus L10 for the PL2000 chassis. Even have enough NOS Toshiba transistors for several builds. But quality switches that fit the chassis and faceplate are a issue. I'll get back to it once I retire and can keep from getting sidetracked.
Given all the different preamps built, there's probably no way to make a preamp retrofit board profitable.
Easier just to buy a Acurus or whatever and call it done.
Given all the different preamps built, there's probably no way to make a preamp retrofit board profitable.
Easier just to buy a Acurus or whatever and call it done.
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