Brand new Kenetek T4B Opto-Attenuator – Direct replacement for UA, Universal Audio, Urei, Teletronix T4A, T4B or T4C units. These will fit in any LA-2A, LA-3A, BL-40 or clones.  – FREE SHIPPING!!! (US only).  YES – These work in the Klark Teknik KT-2A!  Many of the positive feedbacks I’ve gotten lately on Ebay are from people upgrading their KT-2A’s.
There’s a reason top manufacturers like Warm Audio, Stam Audio, Serpent Audio and Skibbe Electronics have Kenetek T4Bs inside – classic sound!
Kenetek
has been manufacturing T4B’s for over 20 years. During that time we
have discovered how to make the *best* T4B’s available – custom
photocells manufactured to our specifications (not off-the-shelf
parts), custom EL panel manufactured to our specifications, proprietary
PC board incorporating a ground plane for lowest noise, and no less than
5 quality assurance tests throughout the build and test process. Each
unit is assigned a serial number and test data is kept on every unit.
Kenetek T4B’s come with a 3 year warranty. If your T4B becomes defective
simply return it to us for immediate repair or replacement.
Available in four different release times: Classic (Medium), Way Slow, Good Slow, and Good Fast. Please specify the release time you want. If none is specified a Classic (Medium) unit will be shipped. Classic Medium is the best overall choice for multi-purpose compression. Bass guitar and other low frequency instruments may be slightly better served with either a Good Slow or Way Slow unit. Guitars and fast, punchy vocals do slightly better with a Good Fast  unit. Drum overheads do best with a Good Fast unit.
Kenetek T4B’s are in use daily by audio professionals all over the world for mastering, mixing and tracking hits in every genre. A new Kenetek T4B will restore that classic sound to your original LA-2A or LA-3A compressor.
Some comments by our customers:
“Just had to drop you a note to say how pleased I am with the two T4B’s I
purchased from you and received today, Friday – having just ordered
them Wednesday. I had recently purchased a ’70 LA3a as a companion to my
’71 LA3a that I’ve had for 15 years. My old ’71 has been working fine
but my ‘new’ one had a failing opto with a super-slow release time. So I
ordered a pair of your TB4’s to hopefully keep the two units relatively
performance matched. I compared the functioning 71’s opto with your new
ones and found the compression and release characteristics almost
identical sonically. What a great product you have in these! “
-Gar Robertson
“Just wanted to drop you a quick line to tell you I’ve popped the T4 into my UA LA2a reissue, and it’s transformed it miraculously (obviously, you knew it was going to do that, I didn’t)”
-Lee Russell
“I did some experiments with T4B clones way back and it turned out that joe-electro´s version is closest to the original Urei T4Bs I have at hand. His stereomatching is perfect and he´s a cool guy to deal with. Many thumbs up!!! I can highly recommend his services.”
-jensenmann
on GroupDIY.com
“KICK. ASS.”
-Eric Boulanger
Bakery Mastering
“I have now used your T4B’s for a month or so and I think they work exactly as they should. Compression is smooth and easily controllable. Perfect. Absolutely.”
-Roni Martin
on GroupDIY.com
“Big thanks for getting these out. I don’t know why anyone would buy elsewhere. Your T4B’s put the magic back in my LA3A’s while UA and others are getting out of line. Thanks for making a great product that keeps the vintage equipment enjoyable. Make Jim Lawrence proud!””
-Mappee
on GroupDIY.com
Note: Your T4B will have a different serial number and will come with its own Warranty Certificate showing the effective date for the 3 year warranty.