Choke?

Green77 · 1st September 2009, 02:59 PM

Hi!
I'm thinking of bulding Triode Dick's "Bill KT88" ( http://www.triodedick.com/ )
In his PSU he's have two chokes 5H/500mA..I'm haveing 2 chokes 3H/500mA. Is it a big diffrents? What will that do to preformence?

Many thanks //Daniel

hidnplayr · 1st September 2009, 03:01 PM

You can simulate the difference in voltage and ripple using duncan's PSU designer: http://www.duncanamps.com/psud2/index.html

whitelabrat · 1st September 2009, 03:11 PM

3H's are probably good enough. An important thing to look at is the resistance of the choke where it may raise or drop the voltage if it doesn't match the 5H spec's.

boywonder · 1st September 2009, 03:17 PM

Download and model your power supply and and the Bill power supply in PSUDII. You will probably have slightly more ripple, and depending on the DC resistance of your chokes, your final B+ may be a little high or low, but they should work just fine.

http://www.duncanamps.com/psud2/index.html

The software is quite accurate and straightfoward to use (and free), and will allow you to predict your B+ voltages, as well as ripple, ringing/overshoot, etc.

I have been toying with the idea of building the Bill or the mono Bill, so I'm curious about this design.....

Green77 · 1st September 2009, 05:57 PM

Thanks. I will use my 3H and try them out..Mine have 9 ohm more dc resistanse (my 35 ohm and Hammond 5H/500 have 26 ohm)
//Daniel

1st September 2009, 02:59 PM	#1
Green77 diyAudio Member Join Date: May 2007 Location: MJOLBY	Choke? Hi! I'm thinking of bulding Triode Dick's "Bill KT88" ( http://www.triodedick.com/ ) In his PSU he's have two chokes 5H/500mA..I'm haveing 2 chokes 3H/500mA. Is it a big diffrents? What will that do to preformence? Many thanks //Daniel

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1st September 2009, 03:01 PM	#2
hidnplayr diyAudio Member Join Date: Sep 2008	You can simulate the difference in voltage and ripple using duncan's PSU designer: http://www.duncanamps.com/psud2/index.html

1st September 2009, 03:11 PM	#3
whitelabrat diyAudio Member Join Date: Dec 2006 Location: Maryland	3H's are probably good enough. An important thing to look at is the resistance of the choke where it may raise or drop the voltage if it doesn't match the 5H spec's.

1st September 2009, 03:17 PM	#4
boywonder diyAudio Member Join Date: Jan 2008 Location: So.Cal.	Download and model your power supply and and the Bill power supply in PSUDII. You will probably have slightly more ripple, and depending on the DC resistance of your chokes, your final B+ may be a little high or low, but they should work just fine. http://www.duncanamps.com/psud2/index.html The software is quite accurate and straightfoward to use (and free), and will allow you to predict your B+ voltages, as well as ripple, ringing/overshoot, etc. I have been toying with the idea of building the Bill or the mono Bill, so I'm curious about this design.....

1st September 2009, 05:57 PM	#5
Green77 diyAudio Member Join Date: May 2007 Location: MJOLBY	Thanks. I will use my 3H and try them out..Mine have 9 ohm more dc resistanse (my 35 ohm and Hammond 5H/500 have 26 ohm) //Daniel

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