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post #121 of 298
As I have been saying. :^)
post #122 of 298
Thread Starter 
Sorry jamato8, I wasn't trying to say that you had not been accurate or correct. The interesting bit in that snippet was:

'I don't know about the long term robustness, I have had one start to spark on turn-on/off after a year or so service, in a LCLC power supply configuration with a 8H choke and 40uF first cap. Current was well within specs.'

Seems that even one that starts out fine can eventually start sparking.
post #123 of 298
Yes because they have too much initial current draw on start up. Also, we don't know the long term reliability of the Sophia, which is correct but again what is specified is a 4uf cap max or an inductor of 15 to 20 henry with enough DCR or an added resistor. That is how the tube was designed and how it is meant to be operated.
post #124 of 298
My Sophia had about 10 hours on it when I first noticed the flashes. I also have a NOS 5R4GA that hasn't flashed, but I've used it very little. The stock Sovtek rectifier flashed, died, and took out the fuse when I first bought the amp. Jack sent me a warranty replacement Sovtek, which I haven't used yet, along with the Sophia that I ordered at the same time.
post #125 of 298
Quote:
Originally Posted by sclamb View Post
The flash and/or spark is only at switch-on. After that the amp and tube run fine.

Did someone in this thread not mention that the 5AR4 and 5U4G would be fine - something to do with direct and indirectly heated tubes?

I have used a Sovtek 5AR4 and there is no flash or spark at switch-on. Unfortunately, listening to it after the Sophia Princess really shows how much better the Princess is - more definition, more air, more space around the instruments................

I have to get this working with the WA6 SE!

It would be interesting to see if everyone using the Sophia Princess with the WA6, WA6 maxxed, WA6 SE and WA6 SE maxxed is getting the flash and/or spark issue. If not then it may be faulty tubes and not the amp circuit.

So far we have two WA6 SE maxxed users with the problem. Anyone else care to add to this list with a Yes or No?
I've got a fully max'ed out WA6 SE with Sophia princess 274b. I think I put at least 200 hours on the tube, and no spark on start up yet. The only thing is the 274b got dark.
post #126 of 298
I think I got the spark on the stock Sovtek tube as well. It's harder to see on the Sovtek though. It's best to turn the amp on in the dark to test for sparks.
post #127 of 298

What Does That Mean...

Quote:
Originally Posted by dan_can View Post
I've got a fully max'ed out WA6 SE with Sophia princess 274b. I think I put at least 200 hours on the tube, and no spark on start up yet. The only thing is the 274b got dark.
What do you mean... "it got dark?"

Do you mean the glass got a dark / burn spot?
post #128 of 298
Thread Starter 
Quote:
Originally Posted by Gradofan2 View Post
What do you mean... "it got dark?"

Do you mean the glass got a dark / burn spot?
I think he means that the tube glass gradually discolours from the heat. I have heard other say this happens to the tube.
post #129 of 298
Thread Starter 
Quote:
Originally Posted by robinje View Post
My Sophia had about 10 hours on it when I first noticed the flashes. I also have a NOS 5R4GA that hasn't flashed, but I've used it very little. The stock Sovtek rectifier flashed, died, and took out the fuse when I first bought the amp. Jack sent me a warranty replacement Sovtek, which I haven't used yet, along with the Sophia that I ordered at the same time.
Thanks for the information. Was the Sovtek a 5AR4? I have one that I have used and it doesn't seem to flash, but I understand that the 5AR4 is better equipped to deal with the switch-on surge than the 274B or 5U4G.
post #130 of 298
Thread Starter 
Quote:
Originally Posted by dan_can View Post
I've got a fully max'ed out WA6 SE with Sophia princess 274b. I think I put at least 200 hours on the tube, and no spark on start up yet. The only thing is the 274b got dark.
That's good to hear that the 274B is working fine after 200 hours. I don't suppose your transformer has a low volume faint hum at all?
post #131 of 298
Thread Starter 
Quote:
Originally Posted by Ragonix View Post
I think I got the spark on the stock Sovtek tube as well. It's harder to see on the Sovtek though. It's best to turn the amp on in the dark to test for sparks.
Was that a 5AR4 or 5U4G?
post #132 of 298
Quote:
Originally Posted by sclamb View Post
That's good to hear that the 274B is working fine after 200 hours. I don't suppose your transformer has a low volume faint hum at all?
My power transformer does hum, but it really doesn't bother me at all.
post #133 of 298
Thread Starter 
Oh dan_can, you don't know how happy I am to know that I am not alone
post #134 of 298
Misery loves company, doesn't it
post #135 of 298
Perhaps there is no problem at all. Although, the sparking Princess is a cause for concern. My assumption is that Woo Audio built every WA6 SE to specification. That does not mean that a component failed, which should fail soon after put into operation. That said, I do not think it is necessary to start talking about changing internal components. This is a potential Woo Audio warranty situation and you need to follow their intructions to flush out the anomaly.
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