Hi,
I run to this forum while I was looking at Nelson Pass's web page. I have been following the discussions in this forum for a few weeks and now decide to join, hopefully to get some advice and help along the way in building the Zen V4.
I have gathered a non-functioning amp case with a dual +-70V unregulated PS from 2 torodal Xformers. I am using this to build the V4 and may be later the Aleph. Currently I have almost finished with one channel.
Right now, I am using a Jadis DA60, on loan from my friend. Unfortunately, one channel of this beautiful machine recently refused to make any sound. I suspect some fault with one of the 12AX7 or its neighbouring components. Not sure yet. I wonder anyone could point me to its schematic on the web. Thanks in advance.
CY
I run to this forum while I was looking at Nelson Pass's web page. I have been following the discussions in this forum for a few weeks and now decide to join, hopefully to get some advice and help along the way in building the Zen V4.
I have gathered a non-functioning amp case with a dual +-70V unregulated PS from 2 torodal Xformers. I am using this to build the V4 and may be later the Aleph. Currently I have almost finished with one channel.
Right now, I am using a Jadis DA60, on loan from my friend. Unfortunately, one channel of this beautiful machine recently refused to make any sound. I suspect some fault with one of the 12AX7 or its neighbouring components. Not sure yet. I wonder anyone could point me to its schematic on the web. Thanks in advance.
CY
Re:Re: Greeting from a newcomer
Hello,
Welcome.
I did a search on the net for the Jadis but as expected nothing useful for you turned up.
When you have opened the amp,do a visual comparison between the two channels.
Often when something goes wrong in a tube amp it is visable,but in your case it may be something as silly as a loose connection.
Small tubes such as the 12AX7s almost never go bad.
What can happen is a bad connection in the sockets.
Cheers,
Hello,
Welcome.
I did a search on the net for the Jadis but as expected nothing useful for you turned up.
When you have opened the amp,do a visual comparison between the two channels.
Often when something goes wrong in a tube amp it is visable,but in your case it may be something as silly as a loose connection.
Small tubes such as the 12AX7s almost never go bad.
What can happen is a bad connection in the sockets.
Cheers,
Hi Frank,
Actually I have not quite described the whole story. This is the second time the amp exhibits this fault. Last time, I even pulled out my dust gathered scope to have a look at the music. The machine was turned sideway, back uncovered. No smell, no decoloration. After a while, everything was back to normal without a single resistor unsoldered.
You are propably right. The socket connected might be loose.
But my recipe of giving it a ban at its side did not work this time and it is a bit of a hassle to uncover the machine and declare its surrounding 3m being a danger zone, I want to get myself better prepared in terms of schematics, possible faulty components, etc before I venture further.
Last time, I saw some fuse like animals at each of the KT88 sockets. Don't know what they are there for. Would like to check them against a schematic.
CY
Actually I have not quite described the whole story. This is the second time the amp exhibits this fault. Last time, I even pulled out my dust gathered scope to have a look at the music. The machine was turned sideway, back uncovered. No smell, no decoloration. After a while, everything was back to normal without a single resistor unsoldered.
You are propably right. The socket connected might be loose.
But my recipe of giving it a ban at its side did not work this time and it is a bit of a hassle to uncover the machine and declare its surrounding 3m being a danger zone, I want to get myself better prepared in terms of schematics, possible faulty components, etc before I venture further.
Last time, I saw some fuse like animals at each of the KT88 sockets. Don't know what they are there for. Would like to check them against a schematic.
CY
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