Tube Leveling Amplifier

Ripthorn · 12th May 2009, 11:49 PM

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.

grhughes · 13th May 2009, 04:08 PM

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.

grhughes · 13th May 2009, 04:12 PM

The Teletronix LA2A is highly respected.
http://www.recproaudio.com/diy_pro_a...ronix_la2a.htm

Geek · 13th May 2009, 09:26 PM

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!

JohanB · 13th May 2009, 09:55 PM

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.

JohanB

12th May 2009, 11:49 PM	#1
Ripthorn diyAudio Member Join Date: May 2009	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.

13th May 2009, 04:08 PM	#2
grhughes diyAudio Member Join Date: Mar 2005 Location: Cubicle Sweet Cubicle, Springfield, Missouri, USA	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. __________________ " Where's the KABOOM? There is supposed to be an earth shattering KABOOM." MM

13th May 2009, 04:12 PM	#3
grhughes diyAudio Member Join Date: Mar 2005 Location: Cubicle Sweet Cubicle, Springfield, Missouri, USA	If building I'd build this one The Teletronix LA2A is highly respected. http://www.recproaudio.com/diy_pro_a...ronix_la2a.htm __________________ " Where's the KABOOM? There is supposed to be an earth shattering KABOOM." MM

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13th May 2009, 09:26 PM	#4
Geek diyAudio Member Join Date: Sep 2004	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!

13th May 2009, 09:55 PM	#5
JohanB diyAudio Member Join Date: May 2009 Location: Stockholm	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. JohanB

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