Home » Audio » Group Build » SE 300B Project, Part 12 - C3g driver
Forgot to add... [message #31902 is a reply to message #31896] Sun, 18 June 2006 17:42 Go to previous message
Damir is currently offline  Damir
Messages: 1005
Registered: May 2009
Illuminati (2nd Degree)
...that I tried a resistive load, too. With B1+ of 400-410V and Ra=22k (25W Dale wirewound), C3g tube "draws" about 10,1mA (with Rk=280 Ohms, bypassed), and A=44,4 times.
That means rp=3,27 kOhms for the tube with ยต=51 in this OP, and Rout = Ra//rp = 2,85kOhms.
With 2x red LED bias, Ia was about 9,8mA and A=43,4 times.
Similar sound then CCS version, a little "warmer" - can be usable, for sure, but I prefered CCS...
Currently working on the final (in chasis) version...

 
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