Posted by Damir [ 213.202.98.232 ] on September 07, 2005 at 14:23:20:

In Reply to: New day, more tinkering, new results posted by hurdy_gurdyman on September 07, 2005 at 13:47:23:

With too large common cathode resistor (5k), you`ve "biased" your EL34s to about I=15/5000=3mA total, or just 0,75mA per tube!
The original thought was one 100-Ohms resistor between each cathode and ground - that way (with "combination" bias) you`d get probably less then 40mA per tube, OK. If you want one common resistor for all four tubes, then you can use 25 Ohms. But, better to "separate" two channels and use 50 Ohms for L (2xEL34), and 50 Ohms for R ch (2xEL34 again). Two capacitors, of course.

Replies:

• Re: New day, more tinkering, new results - hurdy_gurdyman 15:42:45 09/07/05 (4)
  • Hmm... - Damir 00:46:02 09/08/05 (3)
    • Re: Hmm... - hurdy_gurdyman 08:20:57 09/08/05 (2)
      • actually... - hurdy_gurdyman 08:38:10 09/08/05 (1)
        • Re: actually... - hurdy_gurdyman 10:14:34 09/08/05 (0)