Another simple se question

[newtube]

Sorry fella's, another question . . .

I have just fired my breadboard simple se up for a lunchtime listen and one channel was louder than the other, seemed fine yesterday. . .
So i swapped speaker wires around and sure enough the louder channel moved too, but after a couple of minutes all was well and balance is restored!?

Is that just warm up time or do i have a problem?

Thanks,
Darran.

 

[Ty_Bower]

My Simple SE is equally loud in both channels pretty much as soon as sound begins to come out. I would try swapping the two power tubes with each other and see if the imbalance follows the tubes. If you have a spare 12AT7, I'd try that too.

Try to avoid short-cycling the power switch. If you turn the amp off, let it cool completely before turning it back on.

 

[rknize]

When I have a JJ 12AT7 in there, I hear a similar effect. The amp fades-in gradually like any warming tube amp does, then it seems to stop for a few seconds at a lower volume until it suddenly comes to full volume. It doesn't take minutes as you describe, but it is unusual.

I am guessing it is either some interaction between the input tube and the CCS's or perhaps something with the CCS's when the power tubes come to full conduction and the B+ sags. It seems to happen at different times between the channels and it is much more apparent with the JJs in there.

 

[jörg.s]

Hi Darran,
......... its the same with my SE's.
After three years without any problems i suppose this is common.
I just wait for a quarter of an hour after switching the amps on.
And anything is working fine.
Have fun,
Jörg

 

[w5jag]

The only time I have ever observed a channel imbalance in my Simple SE, it was due to a failing cathode bypass capacitor in the weaker channel.

Win W5JAG

 

[newtube]

I think its the rubbish volume pot i have, at low volume it does it all the time, as soon as its turned up its fine, its the wrong spec and cheap!

I'm ordering a new one from the suggestions in my other thread.