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Title: Eico 720 PSU Post by: WA4WAX on April 05, 2022, 06:10:39 PM The 720 has a choke input supply.
I am thinking about replacing the 40 uF with some 68 uF 105C that I have. Thoughts? Title: Re: Eico 720 PSU Post by: DMOD on April 06, 2022, 01:08:45 AM You'll be going from a total of 20uF to 34uF .
Check the ripple voltage before and after and see if you see any reduction in the 120Hz ripple voltage. Phil Title: Re: Eico 720 PSU Post by: flintstone mop on April 06, 2022, 10:16:12 AM I have read there are limitations on the tube rectifier for increasing the capacitance of the filters. I can't remember the complete story
Fred Title: Re: Eico 720 PSU Post by: Opcom on April 09, 2022, 01:13:42 AM If it's a choke input, it should be OK with a small increase. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
It's always the right thing to do, to actually measure the peak current with full load. The normally grounded center tap is a good place for a shunt and scope, assuming the 720 uses that circuit. |