khstudio
Well-known member
My 1272 Pre is finished & sounds pretty good but I NEED some help so I can put the lid on and go. :green:
OK,
When adjusting the trimmer for Symmetrical Clipping my waves on the scope don't look right. I asked JC (Joel) & he also agreed it doesn't sound right. He said the TOP & BOTTOM halves SHOULD stay Symmetrical when pushed!
Test tone .5v PP. Everything looks OK, I can set both halves of the wave to clip evenly (Just at the point of clipping) but when I push the volume to see what happens when clipping it harder the bottom half stays put & continues to flatten but the top continues to rise (about 1v more than the bottom) with about half or less of the flattening of the bottom. :roll:
- I replaced ALL the active components.
- Both channels do the same thing.
- To my ears & JC's (I sent him samples) it sounds pretty good.
If any of you guys could PLEASE post some pics of your Neve pres at subtle to extreme clipping would REALLY help me out here.
I'm using On Semi - 2N3055G - 60v, 15A, NPN
(Digi-Key PN# 2N3055GOS-ND)
Gain & PAD Settings - onset of clipping (Looks OK)
Looks to be clipping at around 2 volts - input voltage is aprox .5v
Scope - onset of clipping
Gain & PAD Settings - MAX Clipping with GAIN=40
Scope - MAX Clipping with GAIN=40
Top Half is almost 3v & the bottom has droppped a little now to 1.5v
Does this look right?
Thanks,
Kevin
OK,
When adjusting the trimmer for Symmetrical Clipping my waves on the scope don't look right. I asked JC (Joel) & he also agreed it doesn't sound right. He said the TOP & BOTTOM halves SHOULD stay Symmetrical when pushed!
Test tone .5v PP. Everything looks OK, I can set both halves of the wave to clip evenly (Just at the point of clipping) but when I push the volume to see what happens when clipping it harder the bottom half stays put & continues to flatten but the top continues to rise (about 1v more than the bottom) with about half or less of the flattening of the bottom. :roll:
- I replaced ALL the active components.
- Both channels do the same thing.
- To my ears & JC's (I sent him samples) it sounds pretty good.
If any of you guys could PLEASE post some pics of your Neve pres at subtle to extreme clipping would REALLY help me out here.
I'm using On Semi - 2N3055G - 60v, 15A, NPN
(Digi-Key PN# 2N3055GOS-ND)
Gain & PAD Settings - onset of clipping (Looks OK)
Looks to be clipping at around 2 volts - input voltage is aprox .5v
Scope - onset of clipping
Gain & PAD Settings - MAX Clipping with GAIN=40
Scope - MAX Clipping with GAIN=40
Top Half is almost 3v & the bottom has droppped a little now to 1.5v
Does this look right?
Thanks,
Kevin