genghiscohen
Member
- Joined
- Dec 28, 2012
- Messages
- 6
I'm working on a Bass DI with a 6SL7 preamp followed by a 12BH7 WCF driving a 5:1 output transformer. B+ is 300v.
Now, the examples I've found using a white cathode follower all have the preceding stage directly coupled to the grid of the upper WCF triode. However, I would like to have the volume pot directly precede the grid of the output stage. The problem becomes how to avoid having the dc offset appear at the pot.
At of the moment I have coupling capacitors before and after the pot, but I worry that I will inadvertently be creating a variable high-pass filter (or some other as of yet unrealized strangeness) as the volume is adjusted. Would a resistor, 470k or so, in series with wiper prevent the cut off frequency from rising to a problematic level? Or am I making something out of nothing?
Thanks,
Nick
Now, the examples I've found using a white cathode follower all have the preceding stage directly coupled to the grid of the upper WCF triode. However, I would like to have the volume pot directly precede the grid of the output stage. The problem becomes how to avoid having the dc offset appear at the pot.
At of the moment I have coupling capacitors before and after the pot, but I worry that I will inadvertently be creating a variable high-pass filter (or some other as of yet unrealized strangeness) as the volume is adjusted. Would a resistor, 470k or so, in series with wiper prevent the cut off frequency from rising to a problematic level? Or am I making something out of nothing?
Thanks,
Nick