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Vintage T4B vs Reissue T4B
Old 6th April 2016
  #1
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iangomes's Avatar
Vintage T4B vs Reissue T4B

Just thought I would comment about a recent experience. Did a comparison between my old T4B and a reissue T4B from UA in my LA3a's and I found the difference to be significant. I was actually surprised, as I thought that the two would be very similar, but the action of the compression felt quite different. Anybody experienced the same thing?
Old 6th April 2016
  #2
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hasbeen's Avatar
Quote:
Originally Posted by iangomes View Post
Just thought I would comment about a recent experience. Did a comparison between my old T4B and a reissue T4B from UA in my LA3a's and I found the difference to be significant. I was actually surprised, as I thought that the two would be very similar, but the action of the compression felt quite different. Anybody experienced the same thing?
YES!!
There are some LA2A threads about rolling tubes in the UA reissue.

I use a Kenetek T4B with mine.

Old 6th April 2016
  #3
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duo jet's Avatar
+1 Kenetek T4B
Old 6th April 2016
  #4
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If you mean attack and release time with "actio of compression" then the reason might simply be material tolerance in the electroluminescent panel used in T4Bs. If you buy any replacement you´ll be exposed to that because all real copies of T4Bs are made with the same el. panel. The only exception known to me are Kenetek T4Bs because he matches them for original timeconstants (or faster as a special order). ADL does this, too, but I don´t know if they sell their optos to the public.
Old 8th April 2016
  #5
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Keep in mind that old original T4B's tend to have slower release times as they age. So if you're comparing an aging T4B with a newer reissue T4, it's kind of an apples & oranges situation. In my experience the attack & release times of an unused original T4B and a new T4 are pretty close.

But with all of those cells there are lots of odd characteristics that creep in to the equation. Frequency content can affect cells in different ways, and certain kinds of program material (especially bassy stuff) can cause distortion or compression anomalies in different cells.
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