Re: help with ella hum

82.162.96.3

Posted by Victor_A on March 26, 2006 at 15:55:42

In Reply to: Re: help with ella hum posted by tokyofist on March 25, 2006 at 20:11:29:

"...As an aside, I get an open loop when probing the from a ground wire to chassis through the powder coat - maybe the paint is just thicker on my amp? ... "

"...The grounding tab, however, shows continuity to ground..." -- it have to be, because ground is connected with chassis at one point. (Remember paint "scratching" when installing the power supply board?)

Ground have to be connected with chassis at one point -- near the power supply -- as it described in the manual. When Power Supply board installed, Dmm have to show continuety between PS ground and the chassis (through the powder coat). Please check it.

Re: shortcut (heater, cathode) inside the tube--

It often can not be checked with Dmm. The shortcut may occure only when the tube is hot...

First of all, try to change tubes between channels -- one tube at time.
Of course, amp have to be turned off when changing the tube (Just to remind...).

Change one tube, turn amp on, listen, then the next, etc.
If the tube is defect, you will find (hear) it.

If you still have the humm from the same channel -- it looks like construction problem, or defect part in power supply chain, Bias. Try to look at bias filter condenser -- may be it is defect or have "cold soldered".
Check the bias grounds, etc (I think you have double checked them already...)
Check the filament soldering -- maybe "thin" shortcut on the tube socket.

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

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