The Amp Garage

What affect does increasing NFB have on keeping the signal cleaner? More signal is tapped off at the output when you increase the amount of NFB. When you increase the amount of signal tapped off the output and fed back to the PI you are decreasing the gain more. More signal being attenuated/cancell...

110uF as the input/reservoir filter cap is really pushing that GZ34.

0.1uF is fine

With the grid leak resistors we usually use it forms a high pass filter well below our audible range.

Tom I believe the OP is refering to a large cap in series with the grid (so from input jack to grid). It's not a bad idea but as mentioned probably not needed. It is needed however is your amp has power scaling (VVR, VRM, etc.) as when the control is set low you will get some DC on the grid. Don't w...

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[img:120:160]http://img.photobucket.com/albums/v610/kurtlives/th_C3D44F97-C649-4504-92E8-FBDD704D0B0C-10997-000007123C27B94D.jpg[/img] Bus was stuck there stranded for around 5 hours. [img:120:160]http://img.photobucket.com/albums/v610/kurtlives/th_8BBC561D-AFF0-4227-8106-C1134945A875-10997-0000071...

I am currently in a contest on YouTube supporting the Humane Society in order to raise awareness for animals hurt/affected by Hurricane Sandy. If you wouldn't mind taking a minute and watching the YouTube clip below of the video I made it would be most appreciated (even snuck in a guitar into the vi...

briane wrote:please move to fender forum as is not a dumble.

Kind of a dick move there.

What's with the 220K resistors going from the PI plates?

edit: thought those weren't stock, I see them on the schem now.

Yes, when I have measured the voltages to ground the plate and screen are about the same. Andy had suggested measuring them at the socket to see the difference in potential between them. The same or about the same? This is where a good accurate meter is helpful, one what displays a couple significa...

Sounds good

Don't forget to breathe

You need to put the 1M grid leak after the 0.1uF blocking cap on the input. This may be causing your "phaser" issue.

Why have you added the cap and resistor to the volume pot? You don't need them, remove them.

Looking good.
What's the 2.1mm DC jack off to the side for? Powering pedals?

Structo wrote:So this tester is powered by a wall wart @ 19v

How can it reliably test a tube at that low of a voltage?

[img:5616:3744]http://www.orangeamps.com/wp-content/up ... k-View.jpg[/img]

SMPS