New Amp Photo and Schem
- DougH
- Transistor Tuner
http://www.aronnelson.com/gallery/v/Dou ... attWonder/
I've had this finished for a few weeks but just got the chrome knobs.
Haha... I just realized I *still* need to replace that temporary plastic washer on the power switch with a metal one. Oh well...
Thanks to John Lyons for instructions on how to finish the wood.
I've had this finished for a few weeks but just got the chrome knobs.
Haha... I just realized I *still* need to replace that temporary plastic washer on the power switch with a metal one. Oh well...
Thanks to John Lyons for instructions on how to finish the wood.
- analogguru
- Old Solderhand
Information
Nice job... but why 10W-Wonder ? Why not 15W (18W) output ?
How are you satisfied with the gain/overdrive? only one pre-amp stage ?
And finally how are you satisfied with the tricky master-volume circuit ?
analogguru
EDIT: Ah I see now you are using the ECL 82 (6BM8) so only 3 tubes in total and 10W output....
Reminds me to the Hagström 39 (which was based on a mullard application).
http://www.hagstrom.org.uk/Schematics/S ... ematic.jpg
Here is the mullard application:
http://www.bonavolta.ch/hobby/en/audio/ecl82_2.htm
Note the uncommon phase-splitter-stage.
How are you satisfied with the gain/overdrive? only one pre-amp stage ?
And finally how are you satisfied with the tricky master-volume circuit ?
analogguru
EDIT: Ah I see now you are using the ECL 82 (6BM8) so only 3 tubes in total and 10W output....
Reminds me to the Hagström 39 (which was based on a mullard application).
http://www.hagstrom.org.uk/Schematics/S ... ematic.jpg
Here is the mullard application:
http://www.bonavolta.ch/hobby/en/audio/ecl82_2.htm
Note the uncommon phase-splitter-stage.
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
- DougH
- Transistor Tuner
Thanks.
The Master Volume works about as well as any other I've tried. The one thing it does is bias the PI colder as you turn it down. This creates more PI distortion which tends to compensate for the lack of power amp drive. I like that aspect of it. In all honesty I usually run it wide open and I rarely use the top-cut control.
The Master Volume works about as well as any other I've tried. The one thing it does is bias the PI colder as you turn it down. This creates more PI distortion which tends to compensate for the lack of power amp drive. I like that aspect of it. In all honesty I usually run it wide open and I rarely use the top-cut control.
- analogguru
- Old Solderhand
Information
I was assuming this.The one thing it does is bias the PI colder as you turn it down. This creates more PI distortion which tends to compensate for the lack of power amp drive. I like that aspect of it.
analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.
Hey, my favorite low watt guitar amp tube! It's about time. Excellent job Doug.
Mine looks like a real bodge job, I know, but I just love the sound of this thing. I actually planned this crappy looking thing out through the whole amp building cycle... A first for me with no intentional clonage... an "am I just full of crap or can I really do this?" moment. I accounted for as much as I could - taken from data sheets to real time measurements...from the power supply through each device through each stage to the output. I
Congrats on yours Doug. As always, yours looks good.
https://img.photobucket.com/albums/v223 ... bm8top.jpg
https://img.photobucket.com/albums/v223 ... inside.jpg
https://img.photobucket.com/albums/v223 ... 8tubes.jpg
Note. Ooops. Sorry... I forgot about the no straight pic req
Mine looks like a real bodge job, I know, but I just love the sound of this thing. I actually planned this crappy looking thing out through the whole amp building cycle... A first for me with no intentional clonage... an "am I just full of crap or can I really do this?" moment. I accounted for as much as I could - taken from data sheets to real time measurements...from the power supply through each device through each stage to the output. I
Congrats on yours Doug. As always, yours looks good.
https://img.photobucket.com/albums/v223 ... bm8top.jpg
https://img.photobucket.com/albums/v223 ... inside.jpg
https://img.photobucket.com/albums/v223 ... 8tubes.jpg
Note. Ooops. Sorry... I forgot about the no straight pic req
- DougH
- Transistor Tuner
Thanks, Clay. I basically followed the AC15 schematic for the audio, did my own power supply, set up the output stage a la the datasheet. The "tone selector" was inspired by the DC30 rotary switch- since I had the SPDT switch lying around.
Sometime I'll open it up and take a pic of the inside.
Sometime I'll open it up and take a pic of the inside.