Connect where it says (external) inductor, which is the proper name for the choke.
It depends on the DC current, and the space available. You can even use a 0.1 or 0.22 Ohm resistor
(of adequate power dissipation) instead. http://www.hammondmfg.com/195.htm
PSUII soft (free)
At least if only one chocke for the two rails you need one with a reversed output chanel around a feritte core to avoid saturation ! Ask to speacialist here in PSU section, I'm not! You can also improve the R with parrelling several resistor to have the same value : less noise . For instance 2 x 2K = 1 x 1K ! Or find a bulk one who support 50 W ?!
I don't know if the caps value are genuine ! I'm intrigued by the 100 nF in the first CRC ! in the second C of the CRC I will swapp the two 15k uF by one of 33 or 47 K uF (BC c114 cap; ex Phillips) and I will supress the two 100 nf before and after the resistor in this CRC filter ! Listen and compare if better ! In the first C after the rectifier bridge I will putt NOT low ESR but Long Life caps like a good industrial one ! (105° C or >)
In the second C of the CRC I will try to swap the 100nf (after tried without it) by 1500 uF Panasonic FC /50V. Maybe swap the main PS traffo by a R-Core ?
But It certainly give you more inputs to make the amp of the french link (not expansive is the pcb
)
At least if only one chocke for the two rails you need one with a reversed output chanel around a feritte core to avoid saturation ! Ask to speacialist here in PSU section, I'm not! You can also improve the R with parrelling several resistor to have the same value : less noise . For instance 2 x 2K = 1 x 1K ! Or find a bulk one who support 50 W ?!
I don't know if the caps value are genuine ! I'm intrigued by the 100 nF in the first CRC ! in the second C of the CRC I will swapp the two 15k uF by one of 33 or 47 K uF (BC c114 cap; ex Phillips) and I will supress the two 100 nf before and after the resistor in this CRC filter ! Listen and compare if better ! In the first C after the rectifier bridge I will putt NOT low ESR but Long Life caps like a good industrial one ! (105° C or >)
In the second C of the CRC I will try to swap the 100nf (after tried without it) by 1500 uF Panasonic FC /50V. Maybe swap the main PS traffo by a R-Core ?
But It certainly give you more inputs to make the amp of the french link (not expansive is the pcb
)
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Hello,
You have to read this information.
You can use them in differential mode ( they call it common mode but in fact it isnt) You can put the two coils in parallel to reduce serie resistance but it will give you less mH too!!
If you really want the best you should go for choke input!!
These Lundahls are better than the Hammonds.
Greetings, Eduard
You have to read this information.
You can use them in differential mode ( they call it common mode but in fact it isnt) You can put the two coils in parallel to reduce serie resistance but it will give you less mH too!!
If you really want the best you should go for choke input!!
These Lundahls are better than the Hammonds.
Greetings, Eduard
At least for the OP a Lectron JH 50 or 60 could match ?
I just see a Swiss company produce it again in a new line : « L'Historique » des Amplificateurs à Tubes Lectron !
I just see a Swiss company produce it again in a new line : « L'Historique » des Amplificateurs à Tubes Lectron !
Famous site ! Someone said to me they have also good clone about preamp !
Jean Hiraga's Super Class-A Amplifier : here you will find the values about the main power supply ! So no 0.1 uF ; You should replace the 2.2 uF MKP (blurp !) by the 1500 uF I talked above !
And look at this final version from Hiraga himself : just for the 20 W class A ! 3 x 66 K uF per rail ! 0.66 F then 1 ohm/16W resistor then 2 x 0.66 F http://www.asrr.org/biblioteca/Revue%20Audiophile/FICHIERS/15/CLASSEA/CLASSEA.html
Here you can see in the fig.2 the values of the caps + the inductor for a 50 W class A ! http://www.asrr.org/biblioteca/Revue Audiophile/FICHIERS/43/CLASSEA2/CLASSEA2.html
Jean Hiraga's Super Class-A Amplifier : here you will find the values about the main power supply ! So no 0.1 uF
; You should replace the 2.2 uF MKP (blurp !) by the 1500 uF I talked above !And look at this final version from Hiraga himself : just for the 20 W class A ! 3 x 66 K uF per rail ! 0.66 F then 1 ohm/16W resistor then 2 x 0.66 F
http://www.asrr.org/biblioteca/Revue%20Audiophile/FICHIERS/15/CLASSEA/CLASSEA.htmlHere you can see in the fig.2 the values of the caps + the inductor for a 50 W class A ! http://www.asrr.org/biblioteca/Revue Audiophile/FICHIERS/43/CLASSEA2/CLASSEA2.html
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Somebody was talk about Hiraga single-ended Némésis in this thread
i was curious and find today audiophile who sell his genuine monoblockswith Tango output trasformers
for 2k8 € in France. Not my budget but pleasure to see on colours photos.
Nice design with CLC filtered psu
I have a pair of those Transformers! They need a re-paint, but you can have them for half price or make a serious offer!
Attachments
Regarding these wonderful old Hiraga designs: The real reason that the power supplies needs to be so heavily filtered, is because the circuit has very low PSRR (Power-supply-rejection-ratio). As you can see from the schematics of both Le Monstre and the 20W/30W Class A, the 'driver' pairs have their reference-point (or positive diff-input / the emitter) on the supply lines. The output pair is inside the local feedback of the drivers via the resistors, so it is the drivers that actually delivers the output signal.
This means that if you have ANY hum on the supply lines it will be very audible!
Yes I have build one (Le Monstre) and I found out that if you just stick it to a 'normal' supply with a transformer, bridge and relatively big - but not extreme - capacitors, you have hum!
So - either you NEED to use big chokes and hundreds of thousands of uF in a CLC supply, or you can do as I do: Use a regulated supply or a capacitor multiplier - the result is the same: no hum or noise, and these supplys can be downsized to 'normal' measures for the output effect with no sound degration.
Of course some of you would still prefer the original solution, which is also a great party-impressor.
This means that if you have ANY hum on the supply lines it will be very audible!
Yes I have build one (Le Monstre) and I found out that if you just stick it to a 'normal' supply with a transformer, bridge and relatively big - but not extreme - capacitors, you have hum!
So - either you NEED to use big chokes and hundreds of thousands of uF in a CLC supply, or you can do as I do: Use a regulated supply or a capacitor multiplier - the result is the same: no hum or noise, and these supplys can be downsized to 'normal' measures for the output effect with no sound degration.
Of course some of you would still prefer the original solution, which is also a great party-impressor.
However, it is also my experience that this special output-stage is one of the main factors for the high sound quality in the Hiragas, so don't try and skimp it and add extra emitterfollowers, as the sound will change completely.
If the OP wants something with a similar 'sound' ( not 100% the same though), look up designs with Sziklai outputs.
In the 'real world' that is the old Nakamichi PA-series and the small Audiolab amps.
In DIY world it is Rod Elliots P3a, PassDIY F5 (MOSFETs) and I think Dr. Bora has one also.
If the OP wants something with a similar 'sound' ( not 100% the same though), look up designs with Sziklai outputs.
In the 'real world' that is the old Nakamichi PA-series and the small Audiolab amps.
In DIY world it is Rod Elliots P3a, PassDIY F5 (MOSFETs) and I think Dr. Bora has one also.
Ncore is not good enough those days ?
Ahhaha : Like the fou fou name for the expansive amps his brand is selling : http://www.lavardin.com/ but sound good ! Unluckilly this guy passed !
The Lectron JH30 with EL84 (could be made with EL81 today ?) was said to sound very good !
Ahhaha : Like the fou fou name for the expansive amps his brand is selling : http://www.lavardin.com/ but sound good ! Unluckilly this guy passed !
The Lectron JH30 with EL84 (could be made with EL81 today ?) was said to sound very good !
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Perhaps Owen's latest regulated power supply might make for a smaller, lighter, better(?) alternative to a big ol' CLC supply?
The Wire - All Boards and Kits Explained Here! - diyAudio
The Wire - All Boards and Kits Explained Here! - diyAudio
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