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Author Topic: Eico 720 PSU  (Read 1539 times)
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WA4WAX
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« 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?
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DMOD
AC0OB - A Place where Thermionic Emitters Rule!
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« Reply #1 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
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flintstone mop
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« Reply #2 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
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Fred KC4MOP
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Patrick J. / KD5OEI
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« Reply #3 on: April 09, 2022, 01:13:42 AM »

If it's a choke input, it should be OK with a small increase.

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.
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