PL3000 preamp Recap Mouser parts list.
- Thread starter Sunnbobb
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If you’re going through all that trouble, I think it’s worthwhile to consider decoupling capacitors on opamps. Typically .1 µF film types or ceramic. If the 3000 is like my 3300 there are a number of ceramic capacitors in the signal chain which would likely benefit with equivalent film type capacitors.
If you think it's a good idea, it probably is. I have no idea how to do that. I'm still in Electronics 200. 
I couldn't believe I was able to buy all new nitrogen filled yellow relays from Walmart of all places, and they were only about $3.50 each. I also replaced the somewhat scorched snubber set up on the switch. Cleaned and exercised the pots and micro switches. Everything is working great, and the recap really cleaned up the bass response and significantly improved the overall fidelity. Now I once again have music while fiddling with a couple other amps that are challenging me.
I couldn't believe I was able to buy all new nitrogen filled yellow relays from Walmart of all places, and they were only about $3.50 each. I also replaced the somewhat scorched snubber set up on the switch. Cleaned and exercised the pots and micro switches. Everything is working great, and the recap really cleaned up the bass response and significantly improved the overall fidelity. Now I once again have music while fiddling with a couple other amps that are challenging me.
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Here's a couple of sites to get started. Some of the op amps in the PL 3000 have different pinouts than modern op amps. Adapter boards are available that convert the modern pinout to the pinouts of the 3000.
https://www.tnt-audio.com/clinica/op_amp_stability_e.html
https://sound-au.com/dwopa.htm
https://www.tnt-audio.com/clinica/op_amp_stability_e.html
https://sound-au.com/dwopa.htm
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I've got my main system PL2000S2 opened for some upgrades, so I've snapped some photos and will give this a shot.
The yellow driver is pointing to a silver mica in the phono section.
Silver mica replace ceramics where cost is reasonable as they get very expensive at higher values.
Where silver mica is too expensive for the higher values, use polypropylene film caps like Panasonic ECW or WIMA MKS. Also replace small value electrolytics in the audio path with film. Film caps get very large in higher values and won't fit available space. Don't use film in the power supply section.
Where you must use electrolytics, use a good audio cap like Nichicon UKZ "Muse".
Stock opamps can be replaced with modern opamps like the OPA2134 mounted on adapter boards called "BrownDogs".
These are available from Cimarron Technology.
Most applications benefit from a 0.1 uF "bypass" cap across the positive and negative pins. Lots of info on the web if your interested.
This is what upgraded PL2000 looks like.
The yellow driver is pointing to a silver mica in the phono section.
Silver mica replace ceramics where cost is reasonable as they get very expensive at higher values.
Where silver mica is too expensive for the higher values, use polypropylene film caps like Panasonic ECW or WIMA MKS. Also replace small value electrolytics in the audio path with film. Film caps get very large in higher values and won't fit available space. Don't use film in the power supply section.
Where you must use electrolytics, use a good audio cap like Nichicon UKZ "Muse".
Stock opamps can be replaced with modern opamps like the OPA2134 mounted on adapter boards called "BrownDogs".
These are available from Cimarron Technology.
Most applications benefit from a 0.1 uF "bypass" cap across the positive and negative pins. Lots of info on the web if your interested.
This is what upgraded PL2000 looks like.
