Rodango Model DB-1 Bass Guitar Head
Here are some follow-up photos of my ultra rare Rodango Bass Guitar Amp. It is the only one in the world! It uses a 6SN7 preamp tube, a 6L6 for driving the splitter transformer and 4-KT88s in parallel push-pull. The power amp design was lifted from the Fender 300PS and the rest is my design and all of it is my construction. Custom made case, panel and plate.
Controls are gain and volume (front) hum and balance (rear) I have calculated its output at around 235 watts.
Here are some follow-up photos of my ultra rare Rodango Bass Guitar Amp. It is the only one in the world! It uses a 6SN7 preamp tube, a 6L6 for driving the splitter transformer and 4-KT88s in parallel push-pull. The power amp design was lifted from the Fender 300PS and the rest is my design and all of it is my construction. Custom made case, panel and plate.
Controls are gain and volume (front) hum and balance (rear) I have calculated its output at around 235 watts.
I just built a phonostage based on: RJM 6dj8/6922
Here are the pictures of my RJM phonostage using 6n1p instead of 6dj8/6922:
On the left is my 12au7 VA/CF preamp, on the right (black chassis) is my RJM phonostage and below is my EL84 driven EL84 parafeed amp.
Here are the pictures of my RJM phonostage using 6n1p instead of 6dj8/6922:
On the left is my 12au7 VA/CF preamp, on the right (black chassis) is my RJM phonostage and below is my EL84 driven EL84 parafeed amp.
Small SE "office amplifier" based on EF184 and 6L6C/KT66 (or any other tubes that fit into the socket) Distributed feedback: 3-4dB local shunt feedback and 8-9dB gNFB.
Jan E Veiset
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Jan E Veiset
Hi Jane,
Looks like a nice simple SE design, a sort of universal SE Amp, which can use several different valves of the same or very similar pin outs. I myself have built a universal SE Amp which can use about 14 different valves of the same general pin out!Although not quite as neat and simple as your design. I also used meters to set the different bias. I would like to build this design to compare it with mine. What is the B+Voltage. Do you use fixed bias? If so what is the original bias voltage? You must forgive my ignorance as I have no knowledge of the maths of building or designing Amps. I just follow the schematics and hope it works!!
If it doesn't I don't have the means of putting it right I just move on to the next schematic and keep my fingers crossed that I don't make any silly mistakes! My universal SE Amp is still working after about 6 years now so I must have done something right! It uses EL 38's as the Output valves and 6J5GT's for the input and a GZ37 as rectifier, at about 400Volts. Best regards Anthony.
Looks like a nice simple SE design, a sort of universal SE Amp, which can use several different valves of the same or very similar pin outs. I myself have built a universal SE Amp which can use about 14 different valves of the same general pin out!Although not quite as neat and simple as your design. I also used meters to set the different bias. I would like to build this design to compare it with mine. What is the B+Voltage. Do you use fixed bias? If so what is the original bias voltage? You must forgive my ignorance as I have no knowledge of the maths of building or designing Amps. I just follow the schematics and hope it works!!
If it doesn't I don't have the means of putting it right I just move on to the next schematic and keep my fingers crossed that I don't make any silly mistakes! My universal SE Amp is still working after about 6 years now so I must have done something right! It uses EL 38's as the Output valves and 6J5GT's for the input and a GZ37 as rectifier, at about 400Volts. Best regards Anthony.
Here is the power supply. The mains transformer is a Hammond 372JX. B+ is ~360Vdc. Bias is adjustable between ~25 and ~45V so most of the power tubes with 7AC/8EP pin layout will do the trick (EL34, 6550, KT66, 5881, KT90, etc).
Jan E Veiset
An externally hosted image should be here but it was not working when we last tested it.
Jan E Veiset
Super Power Plate for my Preamp
Here is my latest Tube Regulated Power Supply for my new Preamp.
It includes Lundahl LL1650 power trans, 2x LL1623AM amorphous chokes as double choke filtering, 47+47uF Blackgate capacitor, and Tube Regulator (6EM7, 6U8A and 5651) based on HP400's schematic.
My wife said this monster sounds very nice but too expensive for me to keep.
http://photoshare.shaw.ca/messages/viewimage/8923773307-1217166999-66627/parm/9305065/page/1/15
Here is my latest Tube Regulated Power Supply for my new Preamp.
It includes Lundahl LL1650 power trans, 2x LL1623AM amorphous chokes as double choke filtering, 47+47uF Blackgate capacitor, and Tube Regulator (6EM7, 6U8A and 5651) based on HP400's schematic.
My wife said this monster sounds very nice but too expensive for me to keep.
http://photoshare.shaw.ca/messages/viewimage/8923773307-1217166999-66627/parm/9305065/page/1/15
Attachments
Hi there,
Here's my latest creation. Still working on it though. Some issues with PSU transformer overheating and hum induced on the anode chokes. But that's almost fixed.....
For more pictures on the build check my website. (-:
Next project is going to be a very tiny (REALY tiny) Push-pull amplifier using 6am4 and E90CC tubes. ((-:
Here's my latest creation. Still working on it though. Some issues with PSU transformer overheating and hum induced on the anode chokes. But that's almost fixed.....
An externally hosted image should be here but it was not working when we last tested it.
For more pictures on the build check my website. (-:
Next project is going to be a very tiny (REALY tiny) Push-pull amplifier using 6am4 and E90CC tubes. ((-: