Hi,
I've always been a keen DIYer but have always been more of a fitter rather than selecting components.
On my Beard 101 power amplifier one of the 4 main capacitors on the HT circuit has failed. They are LCR 400uF 350VDC, which are no longer made and I cannot find any NOS after much hunting. So it's time to select alternative components.
My question is: besides matching the voltage and uF ratings is there anything else I should be considering?
I believe I am right in that the voltage rating can be higher but not lower and there are physical dimensions to consider. I am completely lost when it comes to reading the specification sheets of alternative capacitors, plus I have no actual specification on the LCR originals.
Any advice would be gratefully received!
I've always been a keen DIYer but have always been more of a fitter rather than selecting components.
On my Beard 101 power amplifier one of the 4 main capacitors on the HT circuit has failed. They are LCR 400uF 350VDC, which are no longer made and I cannot find any NOS after much hunting. So it's time to select alternative components.
My question is: besides matching the voltage and uF ratings is there anything else I should be considering?
I believe I am right in that the voltage rating can be higher but not lower and there are physical dimensions to consider. I am completely lost when it comes to reading the specification sheets of alternative capacitors, plus I have no actual specification on the LCR originals.
Any advice would be gratefully received!
Now we have a great choice of high voltage electrolytics as they are used in switched mode power supplies as well. These are of high quality and even smaller in size then the originals. Do you have any diameter and pin distance info ?
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Hey, thanks so much. There are subtle differences between the Beard 100 and 101 on the HT power supply componentry. I guess that is because of feeding 8 KT88s as opposed to 4. I am curious to what the effect is if a higher uF is used, does that mean that the resistors ratings need to be changed too? I wish I knew more about fundamental circuit design!!
The resistors parallel to the capacitors do not need to be changed as these are "bleeders"
They only provide a load to ballance the voltage between the 2 capacitors and make sure no voltage remains after switching off the amp (this can take some time so be carefull).
They only provide a load to ballance the voltage between the 2 capacitors and make sure no voltage remains after switching off the amp (this can take some time so be carefull).