[takezo]

the caps are 330uf/450v cdm caps with additional rubycon caps in smaller
capacities. wooaudio put in what looks like an additional filter stage, not sure
though since the voltage is only 16v, in the front section, as can be seen in
the second smaller pic...


here's some additional internal pics:

 

[atbglenn]

Interesting. What are the purpose of the solid state rectifiers? DC for the 6de7 filaments?

 

[takezo]

Quote:

Originally Posted by atbglenn /img/forum/go_quote.gif Interesting. What are the purpose of the solid state rectifiers?

solid state rectifiers?

 

[atbglenn]

Quote:

Originally Posted by takezo /img/forum/go_quote.gif solid state rectifiers?

bridge rectifiers possibly used to supply DC to the 6de7 filaments?

 

[takezo]

hey john, how much of a factor does the resistor make between
the 2nd and 6th pin of the output tube? will a mills be preferred
over the vishay resistor wooaudio seems to be using?

 

[takezo]

Quote:

Originally Posted by atbglenn /img/forum/go_quote.gif bridge rectifiers possibly used to supply DC to the 6de7 filaments?

unless i'm very mistaken, there isn't any solid state rectifier in the pics...

 

[tommytomickey]

 

[jamato8]

They have gone dc on the heaters, which is what I did on the Woo 3. Some feel AC on the heaters is more dynamic but there are varying beliefs on that. I went DC even on my old balloon tube 27's. They can be quieter that way.

 

[jamato8]

Quote:

Originally Posted by takezo /img/forum/go_quote.gif hey john, how much of a factor does the resistor make between the 2nd and 6th pin of the output tube? will a mills be preferred over the vishay resistor wooaudio seems to be using?

You want a very fine resistor there as the signal is going through it. A good carbon or an older tantalum, before they went to magnetic ends. Even on the 60,000 Audio Note dac they use good carbons so that is what I would use and do use now. I have some of the good tants but they are in storage but to be honest a Kiwame or Riken Ohm would be very fine. I am not crazy about metal film but there are a few good ones.

 

[atbglenn]

ok so woo is using solid state rectification to supply the 6de7 filaments.

 

[takezo]

ok guys, point it out to me... lol

 

[atbglenn]

Quote:

Originally Posted by takezo /img/forum/go_quote.gif ok guys, point it out to me... lol

Those filter caps at the rear are soldered to the DC side of the 2 rectifiers. (the square thingys)

 

[jamato8]

Quote:

Originally Posted by takezo /img/forum/go_quote.gif ok guys, point it out to me... lol

See the two square devices with a cap soldered to them and they have a allen headed screw to hold them in place? those are bridge rectifiers.

 

[takezo]

ahh... thanks for the education atbglenn and john. i thought that was an
extra filter stage...LOL

 

[atbglenn]

And I learned something too, they're devices, not thingys. LOL