Re: One step at a time.

Posted by PeterP (A) on April 8, 2006 at 17:51:44

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 Full Thread

Topic - help with ella hum - tokyofist 18:42:23 03/15/06 (27)

Re: help with ella hum - tokyofist 18:40:04 03/27/06 (0)

One step at a time. - PeterP 16:16:09 03/27/06 (12)

Re: One step at a time. - tokyofist 18:23:14 04/02/06 (11)

Re: One step at a time. - PeterP 17:51:44 04/08/06 (0)

Re: One step at a time. - Victor_A 16:05:19 04/07/06 (9)

Re: One step at a time. - PeterP 17:21:33 04/08/06 (8)

Re: One step at a time. - tokyofist 18:26:49 04/10/06 (7)

Re: One step at a time. - PeterP 05:11:35 04/11/06 (6)

Re: One step at a time. - Victor_A 19:12:58 04/14/06 (5)

Re: One step at a time. - tokyofist 16:44:29 04/15/06 (4)

Re: One step at a time. - PeterP 10:00:11 04/17/06 (1)

Re: One step at a time. - tokyofist 18:50:38 04/18/06 (0)

Re: One step at a time. - Victor_A 02:55:00 04/16/06 (1)

Re: One step at a time. - tokyofist 06:32:08 04/16/06 (0)

Re: help with ella hum - Graham 19:51:41 03/25/06 (0)

Re: help with ella hum - tokyofist 19:05:55 03/23/06 (2)

Re: help with ella hum - RHone 21:00:36 03/23/06 (1)

Re: help with ella hum - tokyofist 04:40:52 03/24/06 (0)

Re: help with ella hum - tokyofist 17:45:31 03/21/06 (0)

Re: help with ella hum - dave19 06:58:39 03/16/06 (0)

Re: help with ella hum - BillEpstein 03:05:29 03/16/06 (6)

Re: help with ella hum - tokyofist 13:55:48 03/16/06 (5)

Re: help with ella hum - BillEpstein 03:51:43 03/17/06 (4)

Re: help with ella hum - tokyofist 14:46:47 03/21/06 (3)

Re: help with ella hum - Victor_A 19:16:58 03/25/06 (2)

Re: help with ella hum - tokyofist 20:11:29 03/25/06 (1)

Re: help with ella hum - Victor_A 15:55:42 03/26/06 (0)

Follow Ups

Re: One step at a time. - PeterP 17:51:44 04/08/06 (0)

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