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Old 23rd June 2002, 07:06 PM   #1
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Default Jean Hiraga Mc circuit

I am interested to built a circuit i notice at http://webook.fset.de/20091999PHCHO/audio/prepre.htm
inside the author recommended to use the transistor recomended to him by toshiba
the transistor is TBC559
is this transistor similar to bc559 made by philips/motorola
i am wondering as tbc559 can't be sourced from where i am staying(M'sia)
any other transistor type that can be used ?Click the image to open in full size.
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Old 23rd June 2002, 09:44 PM   #2
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I think the TBC type are very low noise BC-transistors but not low enough noise for MC pickup. I recommend the SSM2220 (not longer in production but I have those for sale) or the same type in metal can MAT03 from Analog Devices. BCxxx has very different noise specs from different manufactures. Toshiba is the best so far and ON is second. The rest are in third place.
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Old 23rd June 2002, 10:48 PM   #3
hifi is offline hifi  Sweden
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You know that that is no RIAA correction only an MC steppupp.

/micke
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Old 23rd June 2002, 11:11 PM   #4
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I have just looked into my comparison charts:

The 2SB737R is a low-noise pnp, 50V, 0.3A, 0.25W, 100MHz transistor and a direct equivalent to the BC560 (not the BC559 btw).
This is a pretty basic and ubiquitous transistor here in Europe since many years now. I have good experiences with it in different projects, but be sure to get it from a good manufacturer (as peranders put out already) and source (there are fakes...).
But to get a better performance than using two SSM2220 will be a difficult task, even with careful selection...
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Old 24th June 2002, 01:27 AM   #5
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Default Matching

Try to use matched transistors (I think the MAT02). Any offset will put a dc bias on your cartridge.

And you can always invert the design and use NPNs.

jh
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Old 24th June 2002, 07:38 AM   #6
FBJ is offline FBJ  United States
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http://www.jls-info.com/julien/audio/index1.htm
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Old 24th June 2002, 09:32 AM   #7
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Do not try to invert the design. NPNs are usually noisier than PNPs, and noise is the main issue here. MAT03 is a good choice, but bias (collector) current has to be high enough (2mA) to reduce noise voltage (see datasheet).
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Old 24th June 2002, 12:26 PM   #8
tvi is offline tvi  Australia
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Looks a little different from the one in my old l'Audiophile Catalogue

Taken from my catalogue:

<hr width="95%" align=center>
<b>PRE-PREAMPLIFIER
POUR CELLULE A BOBINE MOBILE</b>

<U>VERSION 1</U>
Le jeu de composants de la version 1 est conforme a la description parue dans le n<SUP>o</SUP> 17 de <I>L'Audiophile</I> (figure 1)

Les piles ont ete remplacees par des batteries 6 V 1 AH, qui, outre le fait de resoudre le probleme de la longevity des piles (en moyenne 100 heures), permettent une amelioration subjective tres imnportante (tenue dans le grave, definition, dynamique, recul du bruit, etc.).

Dans certains cas, vu les performances en matiere de bande passante, il est necessaire d'inserer en serie avec l'entree un filtre anti-radio (fig, 2) pour supprimer la reception (captee en generale par les cables platine/pre-preamplificateur).

Le circuit imprime fourni dans le jeu de composants est le meme pour les trois versions, L'implantation des composants est donnee sur la figure 3, Dans ce pre-preamplificateur, il est necessaire d'annuler la derive continue qui apparait a l'entree de la cellule, Pour cela, brancher entre l'entree et la masse un controleur sur l'echelle la plus basse (100 mV) et, a l'aide du trimmer, amener l'aiguille a zero (la cellule ne doit pas etre branchee), La resistance de 3k16<FONT FACE="Symbol">W</FONT> permet d'equilibrer la consommation des parties positives et negatives des batteries.

Dans cette version, I'utilisation des transistors 2SC1775AE ne permet pas d'employer des cellules dont l'impedance de harge est inferieure a 20<FONT FACE="Symbol">W</FONT> (remontee de bruit de fond, chute dans l'aigu, perte de gain), Cette version est donc reservee uniquement a une utilisation avec la DL103 Denon, avec laquelle les resultats sont tout simplement splendides,

<U>VERSION 2</U>
Cette version utilise le meme schema de principe que la version precedente, Toutefois, les transistors utilises sont differents, de meme que le branchement de l'alimentation, Pour une utilisation plus universelle du pre-preamplificateur, nous avons ete amenes a rechercher une autre paire de transistors qui, en matiere de charge de cellule, permet de descendre plus bas,

Le transistor 2SB737R, d'origine japonaise, permet d'obtenir par rapport a l'autre version des caracteristiques de charge (RBB' = 2<FONT FACE="Symbol">W</FONT>) qui rendent ce pre-preamplificateur utilisable avec TOUTES LES CELLULES DU MARCHE dont l'impedance est comprise entre 1<FONT FACE="Symbol">W</FONT> et 40<FONT FACE="Symbol">W</FONT>

De plus, le rapport S/B est ameliore de 6dB, ce qui est enorme, Le haut medium et l'aigu sont encore plus transparents et plus doux,

Le 2SC1775 est un NPN et le 2SB737R un PNP; ces deux transistors ont le meme brochage, Le remplacement sur le circuit imprime oblige a inverser le sens du branchement de l'alimentation par rapport a la version 1: le {+) devient le (-) et le (-) devient le (+), Le trimmer de reglage passe a 3k<FONT FACE="Symbol">W</FONT> et la resistance d'equilibrage de consommation a 6k2<FONT FACE="Symbol">W</FONT>

Ne pas oublier de changer aussi le sens du brancheuent des condensateurs chimiques de 6800uF 10V, Il est bien sur possible d'utiliser les nouveaux transistors dans la version 1,

Cette version utilise des composants a &quot;haute technologie&quot;, Dans le domaine de l'audio, nous sommes pour le moment les seuls a vous les proposer:
<LI>condensateurs de decouplage supercapa NEC de 1Farad/5V, dans le volume d'une boite de cachou: 1,000,000uF;
<LI>resistances au tantale.

Les resultats ne se font pas attendre, Avec un tel pre-preamplificateur, il est possible de faire progresser son systeme d'ecoute dans des proportions insoupconnees.

<U>VERSION 3</U>
Ce modele est la version ultime du pre-preamplificateur, Le schema de principe est identique a celui de la version 2.

II emploie aussi, bien evidemraent, des composants a tres &quot;haute technologie&quot; (super capa), mais, ici, toutes les recherches de I'equipe de <I>L'Audiophile</I> en matiere d'alimentation trouvent leur concretisation et leur aboutissement, Cette version pourrait <U>aussi</U> s'appeler <I>pre-preaplificateur Le Monstre</I>, A l'origine, elle a ete realisee uniquement a titre experimental, les resultats hors du commun qu'elle procure nous ont conduits a vous la proposer,

Comme particularites, signalons:
<li> utilisation de batteries au plomb de 8,5A
<li> utilisation de condensateurs de decouplage d'alimentation de 3.4Farad
<li> cablage d'alimentation avec barres de cuivre de 2mm
<li> poids de l'ensemble avec le chassis: 25 kg

Comparee au top niveau de la production mondiale, cette version est toujours sortie victorieuse, Elle permet d'obtenir de vos microsillons un degre de definition, de dynamique, de douceur, de vie, difficilement descriptible par des mots,

Elle constitue pour nous une reference,
<hr width="95%" align=center>


Hope This helps

James
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Old 24th June 2002, 01:29 PM   #9
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Quote:
Originally posted by ftorres
Do not try to invert the design. NPNs are usually noisier than PNPs, and noise is the main issue here.
I wouldn't put any money on this statement! NPN and PNP are different by nature (electrons and holes...) but in the datasheets of MAT02 and 03 the noise figures are very much alike.

I have no personal experience in this matter I must add.
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Old 24th June 2002, 01:47 PM   #10
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Default NPNs vs PNPs

Just compare page 2 of MAT02 and MAT03 searching for noise voltage density. MAT03 reads better. OK, not by a huge amount, but better.
Once ago, I experienced a diff pair based on these devices, and compared them. Same operating conditions, battery powered, biased by the same current source (CRxxx... don't remember which), and actually, the MAT02 setup was a little more noisy... I stopped here and went with MAT03, but I didn't performed overall tests. Give it a try
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