porto wrote:Pentru yinyangbt as vrea sa spun ca inaltimea bratului am reglat-o pe invers adica am adaugat placi cat mai vechi si drepte sub covorul de cauciuc pe care sta placa de pe care citeste doza si astfel am ptut sa fac un reglaj de vreo 10 mm dar la nevoie poti sa adugi sub bratul Rega cateva saibe.
Da, e o varianta de reglare.Poate incerci cu alta doza, care nu are nevoie de modificarea VTA si sa vezi (auzi) daca mai apare respectiva distorsiune.Poate , intr-adevar , nu se impaca doza cu bratul ?Mai studiez putin sa vad daca gasesc ceva date.
Pot sa-ti spun ca un Goldring Elektra ( MM )vine perfect pe RB 250 si 300 fara modificari de vta. E relativ ieftina (mocca fata de ce ai tu
), ti-o poti permite ca sa verifici(e varianta cu care vine echipat RB 250 din fabrica pe NAD si Goldring). O alta varianta , pe MC e Benz Micro MC20E2 L sau H, o am eu instalata si masurata de mine e OK.(drept ca nu cu micrometrul-dar se comporta fara distorsiuni pe sistemul meu).
Cred ca merita sa faci testul asta, o sa-ti ia ceva timp intr-un week-end.
Experienta buna cu brat Rega are si mselescu, din ce stiu eu
Lyra Helikon 2248.00 € Prices incl. German V.A.T. (19%), excluding shipping costs Technical Data
principle MC
stylus type Lyra spezial
weight (gr) 8.00
tracking force (mN) 17.00
output voltage (mV) 0.50
fixing Half-inch
compliance (µm/mN) 12.00
Goldring Elektra 71.80 € Prices incl. German V.A.T. (19%), excluding shipping costs Technical Data
principle MM
stylus type elliptisch
weight (gr) 4.2
tracking force (mN) 17.00
output voltage (mV) 5.00
fixing Half-inch
compliance (µm/mN) 16.00
Benz Micro MC-20 E2 H 159.00 € Prices incl. German V.A.T. (19%), excluding shipping costs Technical Data
principle MC
stylus type elliptischer diamant
weight (gr) 4
tracking force (mN) 20.00
output voltage (mV) 2.20
fixing Half inch
compliance (µm/mN) 10.00
vad ca pe vinylengine se da caracteristica de greutate a dozei pentru Rega 300 intre 4-11 grame, lyra se incadreaza.
Poate ca si alinierea ar trebui sa incerci sa o faci cu protractorul Rega.Si vezi sa ai greutatea recomandata de apasare pe ac (
masurata cu balanta speciala, nu pe bijbite , numar de rotatii contragreutate, etc. Incearca sa verifici asta intii )
Mai verifica si reglajul antiskatingului, poate si de acolo sa ai ceva probleme
"* A tonearm whose effective mass is rated at 10 grams or below is considered low mass (e.g. early SME’s, Grace 747 etc.). A tonearm whose effective mass is rated between 11 and 25 grams is considered moderate mass (e.g. SME 309, IV, IV-Vi, V, Triplanar, Graham). Arms above 25 grams of mass are high mass in nature (Eminent Technology, Dynavector).
* A phono cartridge whose compliance is rated at 12 x l0ˉ6 or below, is considered low compliance. A cartridge whose compliance is rated between 13 x l0ˉ6 and 25 x l0ˉ6 is considered high to very high. Note: Another way of expressing compliance is um/mN. Here a rating of 5 to 10 is considered very low, 10 to 20 is moderate and above 35 is very high.
* Low mass arms mate well with both moderately high and very high compliance phono cartridges.
* Moderate mass tonearms are good companions for moderate to low compliance cartridges.
* If a low compliance cartridge is used with a low mass tonearm, undesirable resonances can occur in the audible range. Mistracking may also be a problem.
* When a high compliance cartridge is mated with a moderate mass tonearm, resonances in the infrasonic range may occur in addition to some unwanted high frequency damping."
Din cele de mai sus, teoretic nu ar trebui sa apara rezonante ca urmare a unei nepotriviri Lyra Helikon e o doza cu complianta medie (intre 10-20 um/mN) care se potriveste bine cu brate de masa medie (intre 11-25 g) cum e Rega 300
Deoarece la mine s-a produs fenomenul invers, acum mi-as fi luat un pickup pe masura dozei si nu invers!...
