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Tube amp sounds very bright; what's up with that?

That's a start. May loose a bit of volume. I'm going to do the same. # min later. It was already switched to the 4ohm configuration. Back to 8.
 
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The specs for that DIY board showing freq response seems to show (if I read it right) greater dB variation at the relevant points than the tests of the oem ST 70 in the Gillispie paper. Again, I am not saying that folks might not prefer the changed sound, only that the frequency response of the original is more accurate per those particular tests.
 
tygr said:
Why did that seem to help?
Click to expand...

I don't know why... I only know that it did. improvements in the sound of both low & high ends.
Perhaps changing the way the power supply & transformers looked at the load they were driving is what did it.:dunno:
 
It's not the speakers. The only thing that's changed in my setup is the amp.

I don't have a pentode/triode switch. I don't have access to an impedance curve.

I now have the speakers connected to the 4 ohm taps and it really HAS made a difference. I will await the arrival of my "new" tubes and see if that helps as well.
 
tygr said:
I now have the speakers connected to the 4 ohm taps and it really HAS made a difference. I will await the arrival of my "new" tubes and see if that helps as well.
Click to expand...

:thmbsp: I haven't run my ST-70 in a while, but your post made me recall a few years ago, when I was thinking that mine was sounding a bit thin & unsatisfying that another AKer made that suggestion & I was surprised at what a difference it actually made.

My favorite kind of tweak: takes 2 seconds & costs literally nothing.:yes:
 
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