Hi guys!
I would to recapping this old recapping stabilized current power supply from a vintage amplifier.
As you can see in the picture, there are three pink electrolitycs capacitors: the smallest ones are 3300uF 25 V, whilst the biggest one is 6000uF 32V.
I would to replace them with three capacitors with a bigger capacitance...but I repeat, it's a stabilizer current power supply board.
As I always say here, I'm just a newbie...so my question is: is this capacitors up-grade possible or could it a problem in a similar stabilizer current circuit board?
Thank you for your patience and kindness
Regards!
I would to recapping this old recapping stabilized current power supply from a vintage amplifier.
As you can see in the picture, there are three pink electrolitycs capacitors: the smallest ones are 3300uF 25 V, whilst the biggest one is 6000uF 32V.
I would to replace them with three capacitors with a bigger capacitance...but I repeat, it's a stabilizer current power supply board.
As I always say here, I'm just a newbie...so my question is: is this capacitors up-grade possible or could it a problem in a similar stabilizer current circuit board?
Thank you for your patience and kindness
Regards!
Attachments
I would say you need to have RLC (ESR) meter make some measurements prior to do some conclusion.
I really don't see a reason to do something with a device if I can't clearly see a real picture.
I really don't see a reason to do something with a device if I can't clearly see a real picture.
It's from an amplifier from 1976...it's very old, so a recapping will be necessary!
Please, give me your opinion about the old capacitors replacement with some of bigger capacitance😉
Thank you in advance.
Regards.
It's a power supply unit with current stabilizer from a very old amplifier (about 1976/1977).
😉
Regards.
I guess that means 'regulated'. (In many languages term 'regulated' sounds exact like 'stabilized', that's why it is easy to confuse).
I usually start from searching for a schematics. Otherwise I can only guess.
And I'm experienced with old Soviet capacitors, but have very approximate knowledge about foreign ones. That's why my guesses will be very inaccurate or of a very general type.
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Look for 105 C rated caps, a 'general purpose' type.
You wan't find nowadays large axial capacitors now (it is very unlikely they are exist), so prepare to find a decision how to mount radial ones to a PCB instead of axial. But there are still small axial caps on the market (<=100 uF). Sometimes there is a possibility to place radial caps vertical with just making a new hole for one pin.
Those orange caps are likely tantalum (or of a similar solid-capacitor type) and usually work very long and don't have to be replaced.
As I see from a first photo there are only three large axial caps can be 'recapped'. They have not a large capacitance and quite a small rated voltage so it has to be quite easy to find a substitute for them. Actual caps are usually a bit smaller then old ones, this may help too.
You wan't find nowadays large axial capacitors now (it is very unlikely they are exist), so prepare to find a decision how to mount radial ones to a PCB instead of axial. But there are still small axial caps on the market (<=100 uF). Sometimes there is a possibility to place radial caps vertical with just making a new hole for one pin.
Those orange caps are likely tantalum (or of a similar solid-capacitor type) and usually work very long and don't have to be replaced.
As I see from a first photo there are only three large axial caps can be 'recapped'. They have not a large capacitance and quite a small rated voltage so it has to be quite easy to find a substitute for them. Actual caps are usually a bit smaller then old ones, this may help too.
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Yes, it is possible. To it wasn't problems, look for a 'general type' caps for a substitute. For example, a Low-ESR type caps can (in theory) make problems with stability.
Yes, of cause. I don't quite understand why my answers were to Jan but not to Peters8. It seems I've confused something. I'm sorry.
(Unfortunately, I can't edit those my posts already now).
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Thank you so much Vovk Z!
Just a last important question: have I to keep the capacitance/voltage of the original caps or can I replace the two original 3300uF 25 V cap with two new 4700uF 35V caps and the original 6000uF 32V cap with a new 6800 uF 40V (or 50V) cap?
I'm so sorry, I know I'm annoying you but I'm so confused about this thing😕
Thank you again for the precious support!😉
Regards
It is ok to increase a capacitance or rated voltage a bit. You may use 4700 uF 25-35V instead of 3300 uF 25 V, as well as it is totally fine to use 6800 uF 35-50V instead of 6000 uF 32 V.
To be sure I would measure real voltages across them.
Thank you again VovK Z: I've done what you've recommended to do: measuring the voltage across the pink caps with my multimeter setted on AC: on the two 3300uF 35V caps I measured 18 V whilst on the bigger pink 6000uF 32V cap, I measured 20 V.
So you have the final decision on this operation😉
Thank you for your patience and kindness, my friend!
Regards!😉
mio amico Digi-key says you're in luck on the smaller ones, but you'll either have to replace the larger with a radial or run two of the smaller ones in parallel. Since Vovk is saying too low of an ESR is actually a problem then the latter option is probably not a good idea in this case.
40V/3900uF/105Deg polar axial:
https://api.kemet.com/component-edge/download/specsheet/PEG130KL4390Q.pdf
40V/3900uF/105Deg polar axial:
https://api.kemet.com/component-edge/download/specsheet/PEG130KL4390Q.pdf