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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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It is currently 17 Jul 2019, 17:40

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PostPosted: 02 Jul 2019, 21:49 

Joined: 02 Oct 2014, 20:36
Posts: 28
Kt88 oddblock and baxandall eq+4s line stage,working flawless every day,marvelous sound!! Thanks all

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PostPosted: 05 Jul 2019, 13:33 

Joined: 21 Sep 2014, 12:07
Posts: 25
I just figured out why I was having soooooo much trouble with my KT120 amp, so I wanted to share my saga. I had inadvertently misconnected the LM317HV pins. The current regulator page shows the out pin and the adjust pin connected together and then going through the "load". In actuality, the "adj" pin goes directly to ground, and the adjusting resistor goes from the "out" terminal to ground like the KT120 schematic. Of course I was too much in a fog to notice this little error, :confused: and practically scratched a hole in my skull trying to figure out just why I couldn't get the thing to work properly. Just for good measure (and because they're cheap) I paralleled 3 of the LM317HVT chips, so in theory they'll run cooler. So far, so good!

PostPosted: 06 Jul 2019, 21:46 
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Joined: 04 Jun 2008, 20:59
Posts: 3987
Location: Arizona, USA
Hi, That will do it for sure. I parallel two in the KT120 amps. One would hold it with a really good heat sink, but the price of the heat sink is more than a second 317. I was initially worried that they would not share the current well, but my testing revealed that if they are from the same production batch they do very well. Under 10% differences and usually only about 5%. Cheap insurance.

Good listening

Some of my DIY Tube Amplifier Projects:

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