Harman kardon a300 rebuild


Hi everyone. I’m replacing the can capacitors on my a300 with custom built caps from Hayseed Hamfest. The hot can (cardboard wrapped) is made by GE and its specs are printed on the can as 60-100 micro farads at 350v. I’m concerned about the range of uF as I need to specify a uF rating for them to build a new one. Should I specify 100uF or something in the middle like 80uF?

thanks in advance for your responses 

ccogopher

Showing 1 response by atmasphere

The hot can (cardboard wrapped) is made by GE and its specs are printed on the can as 60-100 micro farads at 350v. I’m concerned about the range of uF as I need to specify a uF rating for them to build a new one. Should I specify 100uF or something in the middle like 80uF?

@ccogopher This kind of power supply is known as a ’voltage doubler’ supply. The cap in the insulated can is floating- its insulated in paper so you don’t get a shock from it. It carries a lot current and so is usually the first part to fail as the filter caps age.

100uF is fine- no worries, especially if you have replaced the original rectifiers, which were pretty sketchy. Obviously a good quality part for that cap is a very good idea- and its mate of the same value. I would find 105C parts for installation if you can find them. 'Snap' caps might be a way that you can find the value and they could be mounted with cap clamps.

This is a very nice sounding amp once properly restored- its worth being careful and as neat as you can with the restoration!!