I also sent a message to Koss regarding this matter.
Now I want to build a tube amp for my stats (the eXStata does its job, but you see, it doesn't glow softly red in the dark ). I have the egmont clone in mind (the schematic can be seen on the 7th post of this thread) for which the 6S4A are on their way. I have a small question regarding the power supply. The transformers I am ordering are custom and it really doesn't cost more to go with 25VA, 35VA or even 40VA rather than 16VA. I thought it could be something like this :
2*250VAC for a current of :
- 5mA per 6AS4 at idle
- 1mA per 12AX7 at idle
1) 16 VA (using 7mA for each 6AS4 and 2mA for each 12AX7 )
2) 25 VA ( using 10mA for each 6AS4 and 5mA par 12AX7)
(I also have to mind the size of the transformer though)
Also regarding the power supply, I understood I needed to separate the heater supply of the 12AX7 from the 6S4A. Are two windings enough ? I mean, feeding the four 6S4As with the same heater winding isn't a problem ?
Edited by bidoux - 4/5/13 at 11:22am