current needed for 4x50l6 & 3x6sn6

virtualmxxx · 06:56 PM

How much current or VA do I need from iso transformer to power 4x50L6s and 3x6SN7s & 1x50y6?

VictoriaGuy · 13th October 2011, 09:05 PM

Quote:

Originally Posted by virtualmxxx

How much current or VA do I need from iso transformer to power 4x50L6s and 3x6SN7s & 1x50y6?

Look up the specs (heater current, max plate dissipation, etc. )for the tubes and list them here, then somebody will help you work out the answer.
Also, post the schematic for your amplifier, please.

BTW, you might consider contacting a moderator to delete your duplicate post on this topic.

kevinkr · 13th October 2011, 09:10 PM

Let me know where the dup thread is and I'll remove it.. One thread should be enough...

Edit: Never mind, found it...

VictoriaGuy · 13th October 2011, 11:24 PM

Virtual-
You really need to get used to coming back to your original thread and posting a 'Reply'.....please don't keep hitting the 'New thread' button!

Anyway, you said:

How much current or VA do I need from iso transformer to power 4x50L6s and 3x6SN7s & 1x50y6? 50L6 .15A filament Max plate dis 10W
50y6 .15A filament Max plate current 450ma
6SN6 .60A filament Max Plate dis 2.5W

This is a very rough method:
Work out the VA for the filaments first....
50L6 4 x 0.15 x 50

etc

then just use some approximate numbers to estimate the draw from the B+/HV side
50L6 say 50mA @200v... VA=.050 x 200 or just use the W ratings for the tubes 10W for 10VA, etc...
etc

Then multiply by a 'safety factor' to get an idea of the VA rating for your isolation transformer

13th October 2011, 06:40 PM	#1
virtualmxxx diyAudio Member Join Date: Oct 2011	current needed for 4x50l6 & 3x6sn6 How much current or VA do I need from iso transformer to power 4x50L6s and 3x6SN7s & 1x50y6? Last edited by virtualmxxx; 13th October 2011 at 06:56 PM.

13th October 2011, 09:10 PM	#3
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Let me know where the dup thread is and I'll remove it.. One thread should be enough... Edit: Never mind, found it... __________________ www.kta-hifi.net

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13th October 2011, 11:24 PM	#4
VictoriaGuy diyAudio Member Join Date: Dec 2008 Location: Victoria, BC	Virtual- You really need to get used to coming back to your original thread and posting a 'Reply'.....please don't keep hitting the 'New thread' button! Anyway, you said: How much current or VA do I need from iso transformer to power 4x50L6s and 3x6SN7s & 1x50y6? 50L6 .15A filament Max plate dis 10W 50y6 .15A filament Max plate current 450ma 6SN6 .60A filament Max Plate dis 2.5W This is a very rough method: Work out the VA for the filaments first.... 50L6 4 x 0.15 x 50 etc then just use some approximate numbers to estimate the draw from the B+/HV side 50L6 say 50mA @200v... VA=.050 x 200 or just use the W ratings for the tubes 10W for 10VA, etc... etc Then multiply by a 'safety factor' to get an idea of the VA rating for your isolation transformer

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