DR #49 - Unique Audio Equipment - Phase Linear 1000 Service - Part 1
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- čas přidán 30. 06. 2023
- In part 1, I document the initial service of this Phase Linear 1000, which includes servicing and testing the main PCB and the peak unlimiter PCB.
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It is especially interesting to watch a repair of something you once owned. The unit I owned was purchased in 1976 and was very effective in use. Five years later it developed a noise best describe as a two stroke outboard motor at idle. It was repaired and put back into use. I sold it in 1995 to a vinyl enthusiast who was thrilled to have it.
As someone learning electronics repair, this is as excellent video both in presentation and explanation of your thought process, thanks for sharing.
Thanks for watching and commenting Keith. I’m glad it’s helpful.
Great video ! good explanation . One tip : use a flush cutter it gives less stress on the cuts .
Thanks for the comment and tip. Always trying to improve.
I currently use this with a B&O turntable, Sunfire Pre and Carver TFM-250. You rock 💪
What is it?
@@NathanOakley1980 it reverses the compression typically applied to material recorded on analog media (tape/vinyl). Adjusted properly, it can make the audio sound a bit more "punchy" and "lively."
Great video. Looking forward to part 2.
Peak electronics Atlas Zen tester does a great job and is often available at a discount. Will display Rd at different current levels as well. Comes in really handy with vintage pieces restoration. This one certainly has a made in a shed feel to it, traces lay-out and form, lack of component outline and markings, but the way these boards are flapping in the breeze is just plain stupid.
Totally agree the tester is really good, as is the DCA55 component tester also from Peak.
Love your videos thank you
Im sure I would have missed the reversed polarity sign on those caps, as well.
If you want to upgrade your ESR meter, take a look at the Blue ESR meter. I've used one of them on my bench for years & find it excellent.
Ah yes I’ve considered that type. Maybe someday. Thanks for the tip.
Good work.
Got one of these back in the early '80s to get rid of the noise on poor vinyl. Did a good job with that noise, but found the S/N was really bad. It added more hiss than it took out pops...
Did anyone comment earlier that you sound exactly like Mr.Carlson of Mr Carlsons Lab ?
Haven’t heard that yet. He’s got the subtle Canadian accent though.
Do u have a meter for phase linear 700 meter. I need one
Sorry I do not have a meter.
Dude no! If a capacitor is showing 2.6μf but it's rated for 2.2μf, there's definitely something wrong with it, there's no such thing as an overachiever when it comes to capacitors! I would have pulled it and checked for out of circuit capacitance, esr and DC leakage...
I bet that it's leaking like a tap!
A tired capacitors capacity value should drop off over time, not go up!
I haven't seen many of your videos so I'm not familiar with your test equipment, I'm assuming that you have a basic component tester that shows what's the value, ESR and V loss (DC leakage)...
You want to see low ESR and V Loss and a capacity that's as close to what's printed by never over!
They are the 3 golden rules for capacitor health....
I have seen many others check the capacity of a capacitor only to see that it's capacity is higher than rated and say, oh it's great ... But it isn't.... It's either passing DC current to ground thereby pulling the rail down or worse passing DC current onto the next stage biasing up something else further along... It's one of the main causes of dead transistors...
Edit: I posted this after seeing the first 2.2μf capacitor was checked and I knew that it wasn't fine and so I posted this and got back to the video and was horrified by the rest which I had yet to see... No! None of them are fine...
Sometimes you just have to check out of circuit and compare against a new one, I'm sure that their ESR was way too high...
For now, all I have to measure capacitance is a cheap multimeter. Since it’s cheap and obviously not calibrated, I don’t trust it’s accuracy. I use it to ensure a cap is in the ball-park and obviously not shorted or open. My ESR meter is also relatively cheap, but it is consistent and good for comparing old and new caps of the same capacitance and voltage rating. I also currently have no way of checking for leakage. I work with what I have available to me.
The 2.2uF cap likely has a 20% tolerance, making 2.6 uF within spec. You don't have enough information to summarily say it isn't fine.