Acceptable voltage loss?

[72Blazer]

I have some NOS 25uf 25v electrolytics I want to install on a AB763 circuit board.  They are all measuring a little over 3 volt loss.  Is this acceptable not for this application?  Thanks

Edit:  For clarification, the vloss was measured using TC-1 multi-function tester.

Vr
J.

[tubeswell]

some NOS 25uf 25v electrolytics ... measuring a little over 3 volt loss.  Is this acceptable

What starting voltage are you putting on which pole?

[72Blazer]

some NOS 25uf 25v electrolytics ... measuring a little over 3 volt loss.  Is this acceptable

What starting voltage are you putting on which pole?

Unsure...with the TC-1, you just insert both leads of the cap in the slots and it gives the reading.  My newer sprague 25uf 25v electrolyrics measure 0.0 vloss with this device.

[sluckey]

Vloss is displayed as a %, not an actual voltage. That doesn't mean anything to me and the user manual doesn't explain.

[HotBluePlates]

some NOS 25uf 25v electrolytics ... measuring a little over 3 volt loss.  Is this acceptable

Unsure...with the TC-1, you just insert both leads of the cap in the slots and it gives the reading.  My newer sprague 25uf 25v electrolyrics measure 0.0 vloss with this device.

Personally, I would say "No."

As an interesting comparison, I replaced the power supply electrolytics in a 1964 AC30 I bought.  Kept the old caps in a bag cause, you know, old parts.  I got a Sencore LC75 and checked the leakage of the AC30's original electrolytic caps: with 400vdc applied, leakage was down in the 1-2µA range.  That was better than some tweak "paper-in-oil" coupling caps I had!

I wouldn't assume old caps are good, but sometimes when you actually measure them they will surprise you.  But when you do measure and they show anything other than great results, be wary.

[72Blazer]

I'm definatley not going to use these on this new FSR AB763 new build.  I suppose once I get this built and working properly I could play around/alligator clip them in to see if there is any negative effects.