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In Reply to: RE: Schottky bridge posted by mashley on June 01, 2015 at 15:59:35
I must be missing something; it's not clear why you would be applying 13V to two parallel 6SN7s. Can I suggest that you simulate this in PSUD? It's free to download, and much better for you to have the means to make adjustments and tweaks yourself. As for the method you're using, I've never been comfortable powering filaments with a raw DC supply. I wouldn't do this without a regulator of some sort.
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The problem is I have no idea how to simulate this.
These are my Audio Note P4 monos, they only use one half of the 6SN7.
I'm measuring the + & - on the bridge in dc, with tubes in sockets I can't measure as I have no access except on the bridge itself.
Was measuring before between pin 8 and pin 8 with my meter dc between the two. (tubes removed)
Am I measuring correctly?
Edits: 06/01/15
Did you measure the voltage between the same two nodes before removing the previous rectifiers and replacing with Schottky's? Schottky's have a very low voltage drop compared to almost any other class of rectifier. When you're working with filament voltages that are already low compared to B+, etc, then changing from some other rectifier to Schottky's can have a significant effect, just like the one you are measuring, where it seems your voltage is high-ish (because less voltage is being dropped across the Schottky bridge than was dropped across the previous rectifiers). So, that's one issue, but your final V of 13.1 is not so bad, as long as it is being seen across the two tubes in series, as others have mentioned repeatedly. 13.1VDC is too high for parallel connection of 6SN7 filaments, obviously. Hope that helps.
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