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Old 11th January 2013, 08:25 AM   #1
diyAudio Member
Join Date: Aug 2009
Default 6N3 & 6E2 tubes.

This with tubes is a totally new thing to me and of course a question appear,
for heating these tubes like 6.3V and if i got this right is DC we talk about !
On high voltage side it says where positive and negative goes on pcb but on
heating doesen't say which is what just 6.3V.
On 6E2 tube are pin 4 and 5 heating is that it doesent matter which polarity
these tubes get or ?
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Old 11th January 2013, 09:49 AM   #2
DF96 is offline DF96  England
diyAudio Member
Join Date: May 2007
Valve heaters are normally AC, but DC can be used too.

If you want detailed advice you will need to ask a detailed question e.g. tell us what PCB you are using.
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Old 11th January 2013, 10:30 AM   #3
diyAudio Member
Join Date: Aug 2009
Default Heating.

OK got'it !
So in this case it really doesen't matter whats + or - then ,
i was little curious about a magic eye that i got from e-bay.
I do have a soft start psu with adjustable heat from 4 - 15VDC and
Hi from 110 - 300VDC on this unit.
Found a picture on that magic eye.
Attached Images
File Type: jpg 6e24.jpg (38.9 KB, 141 views)
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Old 11th January 2013, 04:30 PM   #4
tricomp is offline tricomp  Denmark
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Join Date: May 2004
Location: Jutland

Here's the schematic diagram for exactly your EM87/6E2 circuit.
For good measure the EM87 data is also attached.


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File Type: jpg EM87_6E2_sch.jpg (26.5 KB, 127 views)
Attached Files
File Type: pdf Philips EM87.pdf (157.9 KB, 26 views)

Last edited by tricomp; 11th January 2013 at 04:33 PM.
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Old 11th January 2013, 11:35 PM   #5
diyAudio Member
Join Date: Aug 2009
Default 6N3 & 6E2 tubes.

Ok ! now i'm in the clear on that point regarding heating on my tubes,
great information for me as a newbie on tube building.
Thank you guy's.

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