Posted by 2wo [ 71.242.5.40 ] on May 29, 2006 at 20:40:40:

For what there worth. I am referring to my somewhat sketchy notes. These were done in haste, I don’t like to run my 300b’s with the filaments sideways. I was mainly just checking that I hadn’t just built an oscillator and was not driving any of my expensive bits to destruction.

2Vp-p input = 200V output into 16 ohms

At @ 225Vp-p I would just start to see a flattening of the negative going wave. I did not stop to check if it was the driver or output stage

I ran a few frequency sweeps, mostly to check for peaks, or oscillation.

If I remember correctly, (Damir, help me out here) -3db is .707 % of the reference (150Vp-p into 16 ohms) value. If so that corresponds to 12Hz to about 42kHz. The .5 power points are < 10Hz to 85kHz.

Square wave response looked pretty good. a good sharp leading edge and almost no overshoot till > 10k or so.

Like I said this is not meant to be a scientific evaluation. I just wanted to know if it was safe to hook up…John

Replies:

• Re: A few measurements - Damir 08:16:05 05/30/06 (4)
  • What? You don’t get 300 watts from your amp? - 2wo 23:07:08 05/30/06 (3)
    • About 50W with 4xEL34 in UL... :-) - Damir 06:41:09 05/31/06 (2)
      • Re: About 50W with 4xEL34 in UL... :-) - 2wo 21:40:33 06/04/06 (1)
        • That`s right, folks... - Damir 08:46:25 06/05/06 (0)