Hi everyone.
I am planning on building a class A amplifier based on the classic JLH design. Can I have advice on the choice of audio grade capacitors please. I intend on using Metal film resistors .
Thanks. Also. What is the maximum power supply voltage for this design and is the biasing setting up much of an issue. ?
I am planning on building a class A amplifier based on the classic JLH design. Can I have advice on the choice of audio grade capacitors please. I intend on using Metal film resistors .
Thanks. Also. What is the maximum power supply voltage for this design and is the biasing setting up much of an issue. ?
There are 6-10 watts circuits, with various output transistors, even mosfets. There are even no cap output circuits with symmetrical power supply. There are high power versions, with double the output transistors. There is penultimate version, which depending on supply voltage can provide with +/-33 volts almost 60 watts of power into 8 ohm. Assuming adequate heat sink. I am not sure how many i have around, because i gave few to friends, but at least half a dozen i build over the years. I even got penultimate version.
https://sound-au.com/tcaas/jlhupdate.htm
https://sound-au.com/tcaas/jlhupdate.htm
Thanks for that. My intention is to use the 1969 design to start with. I have some 2n3055's so these will be the outputs. The PSU is single rail 60 Volts, however, the diagram I'm studying shows +35 Vdc so I'll be cranking that down of course, if there are many designs of the JLH , I'd like to find one that will accept the 60 Vdc supply. - thanks for the link.
You've seen this? https://sound-au.com/tcaas/index-1.htm
It's got pretty much everything that's fit to print on the JLH class A.
It's got pretty much everything that's fit to print on the JLH class A.
Not very smart idea for classA amp. Regulated supply accepting 60 volts and stabilizing to 30 volts with 3A capability will likely be as complex as amp itself, not to mention will require same amount of heatsink, which is costly.
You can easily make artifical ground and convert single rail 60 volts to +/_ 30 volts, it will require no heatsink, only two medium power transistors.
Better idea, use high quality computer swithing power supply, they respond very well to classA.
