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Old 12th May 2009, 11:49 PM   #1
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Default Tube Leveling Amplifier

Hey guys, I have been a fan of the Summit TLA-50 and TLA-100 for a long time, and got to wondering how hard it would be to build one. I was wondering if anyone had a schematic or if there is any kind of similar project floating around out there. I know I could buy one, but how often do we DIYer's build something that we could have just bought (umm...almost always?). Thanks.
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Old 13th May 2009, 04:08 PM   #2
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Default Problems!

Many of the devices used in the leveling amps as gain control devices are not manufactured any longer and the existing stock of variable mu tubes is dwindling and their price sky rocketing. You might look at using a p channel jfet as a gain control device. I'd buy one rather than dealing with the learning curve which is rather steep.
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Old 13th May 2009, 04:12 PM   #3
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Default If building I'd build this one

The Teletronix LA2A is highly respected.
http://www.recproaudio.com/diy_pro_a...ronix_la2a.htm
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Old 13th May 2009, 09:26 PM   #4
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Variable mu tubes... you mean like the I.F. gain-control tubes?

Last I saw, a box of a hundred costed the same as a Starbucks latte.

Cheers!
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Old 13th May 2009, 09:55 PM   #5
JohanB is offline JohanB  Sweden
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I agree with Geek. There are so many exellent NOS vari-mu tubes out there to last for ever. Nobody use them. Look f.ex. at the TV front-end tube PC900 / EC900 ! Almost 4 decades of linear "square law" regulation !! Perfect for compressor/limiters and costs almost nothing.

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