Re: DIY - TerryC - OTL Asylum

Re: DIY

Posted by TerryC (A) on December 23, 2005 at 15:56:24

In Reply to: Re: DIY posted by hitsware on December 23, 2005 at 14:17:23:

>they no longer use resistors at the plates, but at the cathode instead.
>Makes sense too. Helps swamp out variations in the tubes.

I think that was also what the plate and grid resistors were meant to do.

>I don't know much about tubes, but I would think plenty could go wrong with no obvious physical manifestation at all.

The tubes in question have fusible links. The blown links are what the original post is about. Whether they are blown or intact can be determined by just looking at them.

>I'd use a meter accross the cathode resistors, and ogle my spares for mystical insight ........... :) ........ mike

For this common failure visual inspection is a lot easier than disconnecting the amps and opening them up for testing.

While zen-like tube gazing may be good it is seldom done. The positive experience of examining the tubes and gaining respect for their complex manufacture happens at the best moment to counteract the negative effect of having a tube go bad. With my budget I have had to come up with philosophical approaches to the cost of tubes.

Bill Layer said something about designing a tube tester devoted to the specific needs of Atma-Sphere users, but I haven't seen any mention of it since. I found a schematic for a tube tester. It's complex but maybe could be pared down to just octal base for a start.

http://www.triodeel.com/gmmu.gif (Open in New Window)

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Follow Ups Full Thread

Topic - proper biasing - Kevin 07:53:21 12/18/05 (24)

Re: proper biasing - Zenjabil 19:05:57 12/19/05 (22)

Re: proper biasing - Kevin 06:20:33 12/20/05 (21)

Re: proper biasing - Zenjabil 05:12:17 12/21/05 (20)

have you considered getting the amps updated? - Ralph 10:21:30 12/21/05 (19)

Re: have you considered getting the amps updated? - Kevin 06:31:14 12/22/05 (17)

DIY - Lew 07:02:52 12/22/05 (16)

Re: DIY - Kevin 08:32:59 12/22/05 (15)

Re: DIY - Lew 15:04:17 12/22/05 (14)

Re: DIY - hitsware 07:45:00 12/23/05 (13)

Re plate or cathode resistors - Lew 08:41:55 12/27/05 (5)

Re: Re plate or cathode resistors - hitsware 09:35:23 12/27/05 (4)

Re: Re plate or cathode resistors - TerryC 14:03:11 12/27/05 (3)

Re: Re plate or cathode resistors - Lew 10:02:10 12/28/05 (2)

Re: Re plate or cathode resistors - hitsware 17:39:44 12/28/05 (0)

Re: Re plate or cathode resistors - TerryC 12:52:35 12/28/05 (0)

Re: DIY - TerryC 12:24:44 12/23/05 (6)

Re: DIY - hitsware 14:17:23 12/23/05 (5)

Re: DIY - TerryC 15:56:24 12/23/05 (4)

Re: where's the ' fusible links ' ???? - hitsware 21:11:51 12/23/05 (0)

Re: where's the ' fusible links ' ???? - hitsware 19:08:40 12/23/05 (2)

Re: where's the ' fusible links ' ???? - TerryC 20:13:48 12/23/05 (1)

Re: where's the ' fusible links ' ???? - hitsware 21:26:52 12/23/05 (0)

Re: have you considered getting the amps updated? - TerryC 18:45:51 12/21/05 (0)

Re: proper biasing - Rushton 12:44:21 12/18/05 (0)

Follow Ups

Re: DIY - TerryC 15:56:24 12/23/05 (4)

Re: where's the ' fusible links ' ???? - hitsware 21:11:51 12/23/05 (0)

Re: where's the ' fusible links ' ???? - hitsware 19:08:40 12/23/05 (2)

Re: where's the ' fusible links ' ???? - TerryC 20:13:48 12/23/05 (1)

Re: where's the ' fusible links ' ???? - hitsware 21:26:52 12/23/05 (0)

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