Chrisfromthepast
Well-known member
- Joined
- Mar 5, 2018
- Messages
- 265
Hi, long time lurker here, stuck on a project that should be simple.
I’ve got a 9v guitar booster that I thought would be simple enough to make in an afternoon, but the sound is not great.
I’ve got a fet input stage whose purpose is to provide a clean boost to the subminiature pentode stage.
I selected the source and drain resistors based on this article:
http://www.runoffgroove.com/fetzervalve.html
I like the sound of the fet stage, though I liked it a little better with the source resistor bypassed.
Maybe 3 of those simple stages in a row would give me the overdrive Im looking for.
Currently though, the pentode stage is farty.
Program material sounds very bad on the low end, but is ok about 200hz.
Guitar pickups have similar issues, with neck position humbuckers sounding like trashy farts, but twangier pickups or positions sound pretty good.
Can I stick a capacitor somewhere and get a better low end response?
I tried the tube with 20v supply and it wasn’t different. I tried the tube in triode mode and it wasn’t much different.
I have 9 more tubes, should I swap and see if one of the other ones sounds better?
Should I be testing this type of tube before I used it.
Thanks for the help!
I’ve never worked with these valves before
I set the heater to 1.25, the fet is 2n5457
The tube is 6418 is made for low power consumption. It has a 30v max b+, but in running it on a 9v battery.
I have a schematic, but the upload folder is full. I’ll figure that out shortly
I’ve got a 9v guitar booster that I thought would be simple enough to make in an afternoon, but the sound is not great.
I’ve got a fet input stage whose purpose is to provide a clean boost to the subminiature pentode stage.
I selected the source and drain resistors based on this article:
http://www.runoffgroove.com/fetzervalve.html
I like the sound of the fet stage, though I liked it a little better with the source resistor bypassed.
Maybe 3 of those simple stages in a row would give me the overdrive Im looking for.
Currently though, the pentode stage is farty.
Program material sounds very bad on the low end, but is ok about 200hz.
Guitar pickups have similar issues, with neck position humbuckers sounding like trashy farts, but twangier pickups or positions sound pretty good.
Can I stick a capacitor somewhere and get a better low end response?
I tried the tube with 20v supply and it wasn’t different. I tried the tube in triode mode and it wasn’t much different.
I have 9 more tubes, should I swap and see if one of the other ones sounds better?
Should I be testing this type of tube before I used it.
Thanks for the help!
I’ve never worked with these valves before
I set the heater to 1.25, the fet is 2n5457
The tube is 6418 is made for low power consumption. It has a 30v max b+, but in running it on a 9v battery.
I have a schematic, but the upload folder is full. I’ll figure that out shortly