Hope it's OK to post that here.
Im looking at one thats for sale on another site. I know they're really good, but have no clue on whats a fair price. It has the optical bias. I did some searching but a lot of the sales were from many years ago, so price probably changed.
Physically looks great.
Im looking at one thats for sale on another site. I know they're really good, but have no clue on whats a fair price. It has the optical bias. I did some searching but a lot of the sales were from many years ago, so price probably changed.
Physically looks great.
I decided to pick it up, $1300 inc shipping. Had to pay a little tax.
The same seller also has a s/300 for sale on reverb.com. I never heard of reverb until recently, it seems to target professional musicians, producers, etc...
I was very pleased with the for sale system, especially the make an offer functionality.
I was very pleased with the for sale system, especially the make an offer functionality.
Don't have a variable and it said it was a pull from a working system. I plan on replacing the PS caps.
Cap prices are really high now, didn't realize that.
Instead of using a single 30,000uf (approx I think) 80V per rail, I'm going to parallel 2 15,000 or 22,000uf 80V parts per side.
Cap prices are really high now, didn't realize that.
Instead of using a single 30,000uf (approx I think) 80V per rail, I'm going to parallel 2 15,000 or 22,000uf 80V parts per side.
You will have to modify the GND star point aluminium plate if using different or more cans. Try Online Components for the same size electro caps as used in the original design. Don't go for less uF's per rail, if anything more is better (within reason that is), and yes check for low ESR.
@rayma - what is considered low?
There is a large price differential between (per rail) one large cap with chassis mount and screw terminals and 2 smaller snap in caps.
75V to 80V caps in the 30000uf to 47000uf range are $55 to $120 each
80V caps in 15000uf to 22000uf are $12 to $25 each
So it's $110 to $240 (2 large caps) vs $48 to $100 (4 small caps)
There is a large price differential between (per rail) one large cap with chassis mount and screw terminals and 2 smaller snap in caps.
75V to 80V caps in the 30000uf to 47000uf range are $55 to $120 each
80V caps in 15000uf to 22000uf are $12 to $25 each
So it's $110 to $240 (2 large caps) vs $48 to $100 (4 small caps)
Attachments
For a power amp, the lower the ESR, the better. Certainly you would want the ESR to be the same or
lower than the original equipment. Of course, the capacitors in the amp now are degraded with use.
Bear in mind that several parallel capacitors will result in the lowest ESR cap "hogging" the current.
Also layout and wiring will affect the results. One capacitor is much more straightforward to implement.
Multiple parallel capacitors can heat non-uniformly, and degrade similarly.
lower than the original equipment. Of course, the capacitors in the amp now are degraded with use.
Bear in mind that several parallel capacitors will result in the lowest ESR cap "hogging" the current.
Also layout and wiring will affect the results. One capacitor is much more straightforward to implement.
Multiple parallel capacitors can heat non-uniformly, and degrade similarly.
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Snap in caps are always way cheaper than the big chassis mount cans.
I would go for the 33,000uF Nich LNT's.
I would go for the 33,000uF Nich LNT's.
I recapped my S/100 a few years ago with items from Mouser. Biggest problem was getting the diameter right, so that they fit in the existing clamps. I ended up replacing 15,000 µF, 80V (IIRC) parts with 18,000 µF, 100V United Chemi-Con parts that were the right diameter but about an inch shorter. $22.75 each in 2019. Higher capacitance will, of course, be more expensive.
As I recall, they were never cheap.
Still, they held up well - I have a couple restored Stasis 1's from 1979 (damaged by a few year's storage in marine environment) whose power supply capacitors still met spec after 42 years. Couldn't say the same for the little Tantalum bypass caps...
Still, they held up well - I have a couple restored Stasis 1's from 1979 (damaged by a few year's storage in marine environment) whose power supply capacitors still met spec after 42 years. Couldn't say the same for the little Tantalum bypass caps...
Agreed. My replacement was more precautionary than anything else. The caps that I removed also still met spec.
The 36DA series, weren't those originally made by CDE or someone like that?
This one seems still current, however most such parts are special order, and only in quantity.
I've waited over a year for an order of large electrolytics.
https://www.mouser.com/ProductDetai...EpiMZZMua%2Bgb89%2BTvMxuFmjxB8eso5pkL5AwiQa0=
If those caps still meet spec, I'd use them and watch for a good replacement to become available.
This one seems still current, however most such parts are special order, and only in quantity.
I've waited over a year for an order of large electrolytics.
https://www.mouser.com/ProductDetai...EpiMZZMua%2Bgb89%2BTvMxuFmjxB8eso5pkL5AwiQa0=
If those caps still meet spec, I'd use them and watch for a good replacement to become available.
Two primary tests, leakage and capacitance. Leakage is where you charge the cap to the desired voltage in series with a resistor like 1k and measure the settled voltage across the resistor. 1v = 1 ma leakage.
2nd, no math version, is use that same 1k resistor, apply voltage and time how long it takes to charge to 1/2 that and compare to a known good cap.
2nd, no math version, is use that same 1k resistor, apply voltage and time how long it takes to charge to 1/2 that and compare to a known good cap.
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