I have seen some kits on ebay. How hard are these to set up correctly? I have heard that soem the Nelson Pass designs are difficult to get the biasing correct
Also, I notice the 8w version has 12V input. Is it possible to use batteries or SMPS without sonic degradation?
Also, I notice the 8w version has 12V input. Is it possible to use batteries or SMPS without sonic degradation?
Built both long time ago . Batteries = blacker backgrount ; but dual mono(don't forget I well say dual mono) is way to go for me . Hope you get 92db + box .
Batteries were specified by Hiraga to power at least one of his Class A amplifiers but maintaining deep-cycle batteries in a home is not only very expensive but also awkward, unrewarding and potentially dangerous. The partner acceptance factor is in the negative zone. I suggest a ventilated location outdoors or tap into an an existing solar power battery bank. Some folk believe that batteries ensure the ultimate in pure sound quality but I think it's more about simple, elemental principles and practice which make the "works" easy to appreciate.
The justification for battery supplies is that they avoid power supply noise which is considerable with simple class A designs lacking any PSRR, like le Monstre. If you want to experiment, it would be more practical to use a high current regulated power supply, such as specified for the a JLH class A amplifier, but likely beefed up for the higher current needed to power the chronically inefficient (meaning mighty hot) Hiraga and Pass designs.
This design is for dual, adjustable rails but using only the upper half of the circuit gives you a single, positive adjustable supply which all that's required for many simple designs. The Class-A Amplifier Site - Current Boosted Regulator
There are possibilities for using capacitance multipliers as filters instead of regulation and recent threads discuss this.
The justification for battery supplies is that they avoid power supply noise which is considerable with simple class A designs lacking any PSRR, like le Monstre. If you want to experiment, it would be more practical to use a high current regulated power supply, such as specified for the a JLH class A amplifier, but likely beefed up for the higher current needed to power the chronically inefficient (meaning mighty hot) Hiraga and Pass designs.
This design is for dual, adjustable rails but using only the upper half of the circuit gives you a single, positive adjustable supply which all that's required for many simple designs. The Class-A Amplifier Site - Current Boosted Regulator
There are possibilities for using capacitance multipliers as filters instead of regulation and recent threads discuss this.
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The kits you see on the internet are not the " Le Monstre " 8 watt's sadly
most genuine semiconductors used in this amp are difficult or impossible to find
( yes you can on china fake "new old stock "market ) specialy good range batch for power stage.
Let's name the kits amplifiers...interpretations.
If diyers respect build councils from Mr Pass they bias correctly but you know so many folks are first timers or use strange transistors find on Ebay particulary the jfets.
I was speaking with audiophile guy who wife has divorced because battery chargers in the room.
You need high WAF factor in this situation.
Attachments
Thanks guys
Might pass on the batteries and just go with linear power supply
This is the item on ebay, not sure if the seller posts here:
Hiraga "Le Monstre" 8W A class Amplifier D.I.Y. | eBay
Hiraga A Class Power Supply PCB D.I.Y. (Aleph , Zen-X) | eBay
Might pass on the batteries and just go with linear power supply
This is the item on ebay, not sure if the seller posts here:
Hiraga "Le Monstre" 8W A class Amplifier D.I.Y. | eBay
Hiraga A Class Power Supply PCB D.I.Y. (Aleph , Zen-X) | eBay
You may find this project and comments on the amplifier interesting:
Jean Hiraga's Le Monstre / Monster - DIY Class-A 8W Amplifier
Jean Hiraga's Le Monstre / Monster - DIY Class-A 8W Amplifier
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