Mark in between finishing my 18W and working on my Deluxe Reverb I haven't had the time to work on this little project.
I am going to try and tackle it this weekend though, Ill let you know how it goes.
Valve Jr with Tremolo
Moderators: pompeiisneaks, Colossal
Re: Valve Jr with Tremolo
Chris
I hear ya, I have a Rocket and Matchless Spitfire going right now. Also gigging and the familiar family duties. Oh did I mention going into the office everyday! Let me know, thanks.
Mark
I hear ya, I have a Rocket and Matchless Spitfire going right now. Also gigging and the familiar family duties. Oh did I mention going into the office everyday! Let me know, thanks.
Mark
Re: Valve Jr with Tremolo
Haha I hear ya Mark, Ive been busy to (especially this time of year).
Hooping to spend sometime with it tomorrow night hopefully, Ill let you know.
Hooping to spend sometime with it tomorrow night hopefully, Ill let you know.
Re: Valve Jr with Tremolo
Well I finally got around to tackling this project. GOt busy and distracted with about three other amp builds, haha.
Well I completed it finally though!
First thing I did was put a 51K resistor in parallel to the 50K intensity pot, this brought the value down to approx 25K. This is the value a Champ trem circuit should have. Next I added a large DC blocking cap on the trem line of the intensity pot. A quick tube swap later and the amp was functioning perfectly.
Now that the tremolo effect was sorted out I hooked up the choke I had previously mounted. Removed the first 220R dropping resistor and replaced it with my 170R 9H choke. A bit higher voltages across the amp now, bit more clarity and headroom. A lot less noise and a bit tighter and smoother with the added choke.
Fun amp for practice and recording, easy to get to break up. Actually has a lot of tones from it which is surprising seeing as it's controls are few.
[IMG:640:480]http://img.photobucket.com/albums/v610/ ... CF0218.jpg[/img]
[IMG:640:480]http://img.photobucket.com/albums/v610/ ... CF0220.jpg[/img]
[IMG:640:480]http://img.photobucket.com/albums/v610/ ... CF0223.jpg[/img]
[IMG:640:480]http://img.photobucket.com/albums/v610/ ... CF0225.jpg[/img]
I can post a final schem here if anyone is interested...
Well I completed it finally though!
First thing I did was put a 51K resistor in parallel to the 50K intensity pot, this brought the value down to approx 25K. This is the value a Champ trem circuit should have. Next I added a large DC blocking cap on the trem line of the intensity pot. A quick tube swap later and the amp was functioning perfectly.
Now that the tremolo effect was sorted out I hooked up the choke I had previously mounted. Removed the first 220R dropping resistor and replaced it with my 170R 9H choke. A bit higher voltages across the amp now, bit more clarity and headroom. A lot less noise and a bit tighter and smoother with the added choke.
Fun amp for practice and recording, easy to get to break up. Actually has a lot of tones from it which is surprising seeing as it's controls are few.
[IMG:640:480]http://img.photobucket.com/albums/v610/ ... CF0218.jpg[/img]
[IMG:640:480]http://img.photobucket.com/albums/v610/ ... CF0220.jpg[/img]
[IMG:640:480]http://img.photobucket.com/albums/v610/ ... CF0223.jpg[/img]
[IMG:640:480]http://img.photobucket.com/albums/v610/ ... CF0225.jpg[/img]
I can post a final schem here if anyone is interested...
Re: Valve Jr with Tremolo
Chris,
Nice clean build and fun to finally see this after all this time, thanks.
Mark
Nice clean build and fun to finally see this after all this time, thanks.
Mark
Re: Valve Jr with Tremolo
Thanks for the help and encouragement!M Fowler wrote:Chris,
Nice clean build and fun to finally see this after all this time, thanks.
Mark
Re: Valve Jr with Tremolo
That's great you got that figured out.
A tremolo can be a lot of fun!
A tremolo can be a lot of fun!
Tom
Don't let that smoke out!
Don't let that smoke out!