In Reply to: Re: One step at a time. posted by tokyofist on April 2, 2006 at 18:23:14:
IIRC the .47uF caps are part of the phase splitter. All you need to do is to remove the (4) 0.1uF caps. That is as low as you should expect the hum to be. This hum could be due to a couple of things such as: the output tubes, the tube socket connections, ripple on the B+, heater voltage connections, etc. But from what I'm hearing from you, it seems like the hum in the power stage is acceptable. Am I right?BTW
When you are "all done", if you haven't already done so, you should look at adding the power supply choke option. I think Ella really benefits from the choke and more capacitance on the B+.Have you checked and then double checked your feedback connections? What happens if you disconnect the feedback? A lot of people like Ella in triode mode with no feedback. (I happen to like it for what it is. A nice push-pull UL amp.) It's an easy test to disconnect the feedback and play some music. Then, without changing anything else (volume control levels, source, music), reconnect the feedback. Did the volume of the music go down? If so, then the feed back is correct and you can move on from there. If not, you need to find out why not.
Have fun.
Pete.
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Follow Ups
- Re: One step at a time. - PeterP 17:51:44 04/08/06 (0)