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Old 26th April 2015, 03:30 PM   #1
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Default Help with chokes

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hi to all
The above power supply is from amplifier ecc99/2A3 If you change L1with 10H 150mA 72Ω and L2 with 2.5H 300mA 18Ω the volts will change? if so how to fix it. And secondly if you change the capacitor 100 + 100 mF/500V with two film capacitors 100mF/500V i will have better sound?

Thank you for any reply

Sorry for my english
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Old 26th April 2015, 03:55 PM   #2
DF96 is offline DF96  England
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If you use different chokes you may or may not get a voltage change. This depends on whether you are above or below the critical current for a choke input PSU. Most valve circuits are not too bothered about exact supply voltage.

Using film caps here will make little difference, apart from size and cost.
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Old 26th April 2015, 09:23 PM   #3
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Too many chokes. Just the one is sufficient. Also you may strip the cathode of your rectifier exceeding the maximum capacitance load. See the data sheet on the 5AR4. The maximum tank capacitor value for a GZ34 or 5AR4 is 60uF!
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Old 26th April 2015, 09:26 PM   #4
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I presume the 350V is centre tapped?
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Old 26th April 2015, 10:23 PM   #5
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I thought the maximum capacitance limit was only when the rectifier is feeding directly into a cap instead of directly into a choke like the schematic above?
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Old 27th April 2015, 09:19 AM   #6
AndrewT is offline AndrewT  Scotland
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feed you data into psud2 and see what it predicts.
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Old 28th April 2015, 12:21 PM   #7
DF96 is offline DF96  England
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Max cap value for rectifier assumes a cap input supply. For a choke input supply the first cap can be as large as you like - at least for rectifier life purposes.
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