PLS take a look!

[Klimon]

Recalculating the 1626 cathode bypass cap value for the double dc darling (http://www.geocities.com/TimesSquare/1965/jeremy.html) I get about 280µ for 1hz, a far cry from the 1000µ in the schematic.

Which one is wrong? I used the following values for calculation:

Ra = 2.4k (/2 for parallel tubes)
Mu= 5
Rload= 3k (see schematic)
Rk= 3.2k (see schematic)

Any help much appreciated (this sorta thing drives a man insane)

Simon

[Dave Cigna]

Originally posted by Klimon
I get about 280µ for 1hz, a far cry from the 1000µ in the schematic.

Which one is wrong?

When I do the calc I get about 240uF, so now you need to decide which two (or three) are wrong.

Seriously though, I don't see in his web page where Jeremy said that he calculated the cap for a corner frequency of 1Hz. Odds are he just happened to have a 1000uF cap so he used it; big enough.

[Klimon]

Seriously though, I don't see in his web page where Jeremy said that he calculated the cap for a corner frequency of 1Hz. Odds are he just happened to have a 1000uF cap so he used it; big enough.

Lesson learned Thanks for doing the maths

Simon