neskor

imam i ja negde tu Fluke sondu, ali ne secam se tacno do koliko KV ide mislim da imam i negde gotove plocice za HV za ESL57

pored kalibrisanog mikrofona, potrebo je i kalibrisati mikrofon sa software-om za tacan SPL probaj ovo: https://www.roomeqwizard.com/help/help_en-GB/html/calsoundcard.html

to vec zvuci realnije

pogledaj atachovanu sliku, tamo imas TS parametre za 2528

imas ovde: http://www.hilberink.nl/tannoy/jpvanson/drivers.pdf lepo pise da je osetljivost 91.2dB za taj drajver koliko vidim i Zen se igrao sa njima

Gde ima taj podatak da je taj Mikin Tannoy 98dB?

to vec ima smisla

ovako

Bravo za Ecija Mene nesto slicno ceka, ali nikako da krenem, previse problema me ceka sa tom konfiguracijom, prvenstveno skretnicom. Moja jedinda zamerka je da bi bilo bolje da se bas kutije zarotiraju za 180 stepeni, kako bi bas reflex otvori bili blize centru. I malo mi je krivo sto nece ostati ovde u Srbiji

16:52 tik, tak,tik, tak...

probao i onu Thorstenovu sa e810f i opet bolje mi svira Shishido

da, stavljeni u oklop zbog bruma od okolnih trafoa i prigusnica

za sada bolje mi svira testni Shishido

napravljen Pultec po gornjoj shemi

Ako ide Buc Kesidi onda mora i ovo

kada smo kod domace muzike, ovo mi je super obrada Bajagine pesme

Fs od 48Hz je po meni malo veci problem (ako se ide bez suba)

imas kod brace madjara, dve za 24 EUR+shipping https://www.ebay.de/itm/2x-ECC81-12AT7-Telefunken-Rohre-tube-tested-same-code-TOP/333182458171?hash=item4d9338d93b:g:qXgAAOSwjCVczXNU

video sam to pisanje jos ranije svaki savet ili misljenje je dobrodoslo

Evo i analize cele sheme Originalni tekst je na franscuskom, tako da je provucen kroz google translate The RIAA Pulltech PC 10 RIAA Corrector The RIAA correction preamplifier Pulltech is without doubt, with the amplifier Ampex , one of the projects that mobilized the largest number of participants. It is invested MM. Preyal , Goewie , Cocheteux , and perhaps others I forget, forgive me ... But let's start with an excerpt from Rinaldo Bassi's article in NRDS No. 221 where our dear "paleo Electronologist "has dissected the Pulltec scheme. The input transformer This is the famous K241D from Peerless (a division of Altec ) Forgive us for the little, but this universal transformer accepts impedances of 31.5 depending on the commutations; 37.5; 125; 150; 280; 340; 500 or 600 Wat choice in symmetrical or asymmetrical. The bandwidth at +/- 1 dB is 10 to 30 000Hz. It can operate at voltages as low as 0.5mV and up to 30V! And this without background noise, thanks to a balanced primary winding and coupled with the secondary. The snoring is in phase opposition while the> is 10 to 30 000Hz. It can operate at voltages as low as 0.5mV and up to 30V! And this without background noise, thanks to a balanced primary winding and coupled with the secondary. The snoring is in phase opposition while the signal is in phase. A superb shield offers an efficiency of 90dB. What to dream our audiophiles in search of a cell transformer with voice coil. For'EMT TSD 15, the 37.5 W transformer position is the right one. The secondary is in this case loaded by a resistance of 82 k W ( see diagram ). For a Denon DL 103 it is a load of 125 W the secondary will be charged by resistance of 70 k W If you build the device it is necessary to use a standardized load of 47 k W at the input for mobile magnet cell. For variable reluctance cells, use your usual adapter transformer or pre-preamplifier if you are satisfied with their performance. The first stage Two modest tubes: a 12AX7 and a 12AU7. Yes! it's stupid, but it works. Between brackets, the second stage is virtually identical to the first. The entrance stage looks stupid, but it hides a hint! We enter on the grid of V1 we leave on the plate loaded by 200k W Until then it is normal. A modest 0.05μF capacitor provides the link on the V2 gate (which is more than enough, the attenuation being less than 3dB at 10Hz for a gate leak resistance of 330k W. The amplified signal is recovered on the resistor. load 240k W . the tube is biased at -1V by the cathode resistor of 1800 Wnot decoupled. This is where the trick begins. The connection is direct between the V2 anode and the V3 grid (12AU7). We then find two 12AU7 in parallel, the second being damped by a resistance of 480 W in its plate circuit, which will act on the slope of this tube second tube, and therefore on the overall slope of the two tubes in parallel. We will see later why. In the cathode of the combined tube, there is a resistance of 18k W series with a resistance of 200 W placed in the cathode of V1. The quiescent current that passes through these two resistors will ensure the polarization of V1 (-1.4V) and of course V3 V4 (120V, which provides a bias of -8V on the grid through the direct link). This original montage has several purposes. First of all, by the play of the quiescent currents, a virtually constant gain is ensured throughout the lifetime of the tubes, since the polarization point of the first 12AX7 was not chosen at random. The figure below shows that with 135V on the plate of a 12AX7 and a polarization of -1.5V, we are on a point where the slope, the internal resistance, and therefore the amplification coefficient of the tube are variables. Any drop in tube efficiency input is reflected in the polarization of the output tubes, thanks to the direct connection, the current increases in the 12AU7, thus reducing the polarization of the input tube to a correct value. This is very important for the future, because we must now look at dynamic operation. If you carefully examine the circuit, you will find that looping V3 V4 on the 200W resistor in the cathode of V1, will cause a very particular phenomenon. Against feedback? No it's a reaction. On the Schematic we have indicated a series of + and - corresponding to the positive alternation of a periodic signal. We could have chosen the negative alternation, it would be enough in this case to replace the + by - and vice versa. What will be the effect of this reaction? Given the chosen polarization point (-1.4V), the gate swing will cause slope variations of V1, therefore the amplification coefficient. We will have created a real expander of dynamics ... This is the secret Pulltech. This is the same type of circuit used by Audio Research at the output of the famous SP10. Nothing prevents a manufacturer to tackle this type of circuit very difficult to develop: The rate of feedback must be calculated. quarter-hair "because we risk creating a perfect oscillator if the circuit is poorly controlled, which is not the goal! Cathodes in parallel with the 12AU7, we will then attack the passive filter of the RIAA correction.Before going further, we must talk about the filter. The RLC filter RIAA Ideally, a passive RLC filter that must follow perfectly the disk etch correction curve must be constituted in the following way: A resistor and a parallel capacitor having a time constant of 75 μs which corresponds to a frequency of 2120 Hz (-3 dB). Why 75μs? Simply by that it is the standard of deemphasis in frequency modulation adopted by the USA since 1939 (50μs in Europe). A resistor and a series capacitor having a time constant of 318 μs (frequencies 500.4872 Hz to -3 dB). An inductor and a parallel resistor having a time constant of 3180 μs (frequency 50.04972 Hz at -3 dB) RIAA correction is the algebraic sum of these three curves transmission.C'est the standard filter used by PullTech and reproduced by Tango (EQ600) These filters have an input and output impedance of 600 W .It standard and it is the ideal compromise for a reasonable Q of the filter coils whose resistance rarely exceeds 60 W. However, the good functioning of a filter depends essentially on what is called the image of the impedance of the entrance to the exit and vice versa. Two solutions are possible as we will see: The input and output impedance of the filter is equal to the impedance of the filter itself. In our case, the source and the load should be 600 W . The circuit recommended by Tango consists in isolating the filter between two impedance transformers 600 W each. Heavy and impractical solution although used in some cases. The impedance of the source at the input of the filter should ideally be zero or at least ten times lower than the impedance of the filter itself provided that it is strictly constant throughout the transmission curve of the filter. On the other hand, the load impedance of the filter must be infinitely large or, for lack of better, at least ten times greater than the output impedance of the filter. It is this very difficult solution to be developed which has been adopted by Pulltech thanks to its "magic" circuit. Pulltec : an ideal impedance adapter This is the third advantage of the Pulltec circuit. By the play of the reaction that we analyzed in the preceding paragraph and the resistance of 480 W placed in series in the anode of the second half of the 12AX7, we will act on the slope of the new tube thus combined by the two half in parallel the output impedance of the circuit is 50 W and remains rigorously constant throughout the useful spectrum. The filter can be attacked without disturbing the output of the filter, Pulltec offers the luxury of building a corrector also has a constant impedance and is approximately 50k Wthat is almost 80 times the filter output impedance, regardless of the position of the knobs. This ultra-fine adjustment will allow to correct the bandwidth accidents of certain cells in the high-end spectrum, and to boost or attenuate the very low frequencies (practice to eliminate the rumble). In the middle position, the transmission is rigorously straight. The output stage It has the same structure as the input stage with the exception of the reaction rate which is less important (cathode resistance of 100 W instead of 200 W in the input stage). The output is effected by the cathode of 12AU7 on a output transformer ( Peerless or Triad depending on model) ensuring the normalized symmetric transmission 600 W . If you build the device and you want to do without the transformer, remember to replace it with a resistance of 20k W so that the circuit retains all its dynamic and distortion characteristics asymmetric.

evo ako se neko odluci da pravi Pultec PC-10 RIAA lik je sve istestirao i resio problem ubacivanja Tango LCR modula u postojecu shemu etude PULTEC PC-10 28-11-2008.pdf

samo mala napomena, ako neko bude hteo da pravi Pultec sa LCR RIAA mora da obrati paznju na ulazni kondezator ispred RIAA filtera po semi je on 2uF, sto je premalo za LCR resenje je izbaciti taj kond i postaviti kond od npr. 220nF posle LCR RIAA umesto tog konda od 2uF staviti otpornik od 600R , na taj nacin dobijamo idealnu RIAA krivu

koliko znam Pultec nikada nije imao LCR RIAA vec klasicnu RC

update lik je ubacio jos pedesetak strana slika sa sajma