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Old 18th May 2009, 12:41 PM   #1
newtube is offline newtube  United Kingdom
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Default Another simple se question

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.
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Old 18th May 2009, 12:52 PM   #2
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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.
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Old 18th May 2009, 02:53 PM   #3
rknize is offline rknize  United States
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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.
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Old 18th May 2009, 04:01 PM   #4
jörg.s is offline jörg.s  Germany
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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
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Old 18th May 2009, 08:11 PM   #5
w5jag is offline w5jag  United States
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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
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Old 18th May 2009, 08:55 PM   #6
newtube is offline newtube  United Kingdom
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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.
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