|
OTL Asylum OTL, Output Transformerless Amplifier User Group. |
|
|
|
OTL Asylum OTL, Output Transformerless Amplifier User Group. |
|
In Reply to: Re: Marks's 6AS7G test gig posted by rune on February 26, 2002 at 14:42:38:
I sure hope you mean jig and not gig! There's a charge for a gig.There's really not much to a test jig. I like to use octal relay sockets, because they have screw terminals brought out to the tube socket's 8 pins. You can get hem from places like Mouser. I have a high-current, low voltage DC supply I set to 6.3 volts and then hook it up to the filament terminals. My bench also has a bias supply, which I use to supply about -25 volts to the 6AS7G grid. That's about what you need for about 75 mA of plate current. Next I hook another HV supply up to the plate via a 1 ohm resistor. That supply gets set to about 140 volts DC. The minus side of that same supply get hooked up to the cathode via a 600 ohm 2W resistor. You'll notice a very real similarity to the actual amp circuit here. Make sure the bias supply is on before applying plate voltage to avoid meltdown.
I hope this makes some sense.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- A test gig? - mark 17:30:49 02/27/02 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
