DC Heater Caps

Bengali · 23rd September 2011, 08:12 PM

Hi,

I saw some inside photo of a BAT tube preamp.

They use tons of capacitance in the thousands range.
These are for DC heaters I assume?

What is the reasoning behind these large capacitance caps for?

astouffer · 23rd September 2011, 09:33 PM

The more current you draw the more ripple the caps have to filter. Having DC on heaters with lots of ripple is worse than AC by itself.

Bengali · 24th September 2011, 12:29 AM

from some of the diy stuff, tube pre's, the cap values are generally around 1000uF-4700uF for 2 or 4 tubes.

the retail unit looks like is has 47,000uF or more.

DF96 · 24th September 2011, 11:29 AM

Some people think that if a big cap is good, a bigger cap must be better. Not always true.

23rd September 2011, 08:12 PM	#1
Bengali diyAudio Member Join Date: Oct 2006	DC Heater Caps Hi, I saw some inside photo of a BAT tube preamp. They use tons of capacitance in the thousands range. These are for DC heaters I assume? What is the reasoning behind these large capacitance caps for?

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23rd September 2011, 09:33 PM	#2
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	The more current you draw the more ripple the caps have to filter. Having DC on heaters with lots of ripple is worse than AC by itself.

24th September 2011, 12:29 AM	#3
Bengali diyAudio Member Join Date: Oct 2006	from some of the diy stuff, tube pre's, the cap values are generally around 1000uF-4700uF for 2 or 4 tubes. the retail unit looks like is has 47,000uF or more.

24th September 2011, 11:29 AM	#4
DF96 diyAudio Member Join Date: May 2007	Some people think that if a big cap is good, a bigger cap must be better. Not always true.

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