Distance between 6N23P and a cap?

markusA · 16th September 2011, 05:30 PM

A typical n0ob question...
Caps are supposed to be cool and tubes tend to get hot.
I have a couple of MKP10 caps (2.2uF) that I need to mount as close as possible to a 6N23P tube on a circuit board.

How close is a safe distance? I'll be running the tube @ 100V (10mA each channel). 6.3VAC heating for starters maybe I'll change to DC later on but I'll settle for AC for the moment and just get the experiment up and running.

I'm doing it cirquit board style for simplicity, I have all the tools set up for making my own boards and it makes assembly a piece of cake.

HollowState · 16th September 2011, 05:59 PM

Well, since a 6N23P is not a power tube, and an MKP capacitor is not an electrolytic type, tempture should not be too much of an issue. Electrolytic caps don't like heat because the electrolyte paste inside dries out with heat. Not so with polypropylene types. So assuming your circuit board will be mounted horizontally (with tubes vertical) things can be pretty close. If it's tall (as I think it may be) I'd keep it one inch (2 cm) away if I could. But it really depends on how hot the tube gets and what kind of airflow you will have when finished.

markusA · 16th September 2011, 07:03 PM

The 2.2uF MKP10 is 24x31.5mm (H x W) and the tube socket 10mm (H).
1" is a lot of surface when talking pcb but I guess it's better to have a big pcb than burnt out caps.

dovla · 16th September 2011, 08:05 PM

Does your layout allow you to mount the cap and the tube socket on the opposite sides of the board (cap from the bottom)?

markusA · 16th September 2011, 09:27 PM

I suppose it could be done even though I would like to avoid it if possible.

Tony · 16th September 2011, 11:34 PM

this is how i did it on my 6H23 preamp:

markusA · 17th September 2011, 07:32 PM

I decided to play it safe and follow your advice... Tube on the flipside.

16th September 2011, 05:30 PM	#1
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	Distance between 6N23P and a cap? A typical n0ob question... Caps are supposed to be cool and tubes tend to get hot. I have a couple of MKP10 caps (2.2uF) that I need to mount as close as possible to a 6N23P tube on a circuit board. How close is a safe distance? I'll be running the tube @ 100V (10mA each channel). 6.3VAC heating for starters maybe I'll change to DC later on but I'll settle for AC for the moment and just get the experiment up and running. I'm doing it cirquit board style for simplicity, I have all the tools set up for making my own boards and it makes assembly a piece of cake.

16th September 2011, 05:59 PM	#2
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	Well, since a 6N23P is not a power tube, and an MKP capacitor is not an electrolytic type, tempture should not be too much of an issue. Electrolytic caps don't like heat because the electrolyte paste inside dries out with heat. Not so with polypropylene types. So assuming your circuit board will be mounted horizontally (with tubes vertical) things can be pretty close. If it's tall (as I think it may be) I'd keep it one inch (2 cm) away if I could. But it really depends on how hot the tube gets and what kind of airflow you will have when finished. __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

16th September 2011, 08:05 PM	#4
dovla diyAudio Member Join Date: Mar 2010	upside-down? Does your layout allow you to mount the cap and the tube socket on the opposite sides of the board (cap from the bottom)?

16th September 2011, 11:34 PM	#6
Tony diyAudio Member Join Date: May 2003 Location: Palatiw, Pasig City	this is how i did it on my 6H23 preamp: __________________ http://www.electronicslab.ph/forum/i...?topic=32688.0

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16th September 2011, 07:03 PM	#3
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	The 2.2uF MKP10 is 24x31.5mm (H x W) and the tube socket 10mm (H). 1" is a lot of surface when talking pcb but I guess it's better to have a big pcb than burnt out caps.

16th September 2011, 09:27 PM	#5
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	I suppose it could be done even though I would like to avoid it if possible.

17th September 2011, 07:32 PM	#7
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	I decided to play it safe and follow your advice... Tube on the flipside.

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