I am going to start hoarding K369BL
You are going to enjoy a very noticeable reduction on noise. Not only it refers to ground but uses much less current through the cascode BJT which brings it to better current noise and linearity region. Also 2 K369BL are ideal for LMC since the extra capacitance won't bother the bandwidth with such low coil resistance carts. The penalty is the more defined input overload margin (VPP after first stage gain x100 plus) given the RIAA 20dB rise and vinyl hitting over 0dB modulation its something to know how to handle when matching carts and gain. A 58dB single K369BL with 0.9mV cart did not manage to go clipping with dynamic 45rpm reissues is my harder real life test up to now.
Its everywhere in EU, I could find it in local stores even, maybe harder in the US? A BF245B can be degenerated with less resistance also. A K117GR is acceptable also. Any low noise low capacitance circa 5mA JFET in other words. See if there is something under 20nVrtHz J series American chopper JFET for there is another guide. Those who gonna make SSLVs for it gonna have K117GR spares nonetheless. Since it only takes shorting s&g pins which are sequential in most pin outs when the IDSS is right unaided by degeneration, using several types should be a breeze.
OK. I was unsure of how important that specific part was to performance. Does the degeneration add noise?
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Yes but insignificant when talking low ohms in that position. Mainly the Jfet needs be medium impedance to match the Leds own for better PSRR and their 1mF cap to be good in shorting the noise and hum.
New version gets fired up today. Got dual 175VA instead of 50VA. It will all be cased up, with seperate psu. Also have some 369 coming for comparison.
One quick question. In main pdf, you spec SSlV 1.5. Does this outperform 1.1 which i am currently usiing?
FWIW I experimented a lot with a DL160 (1.6mV) on the double k170 folded and did not notice any clipping even with high modulation records.
I would chose 2 x 11.63 and 11.75/11.77, but let's talk the Grand Master Yoda....
Now you are killing me. Stajo called me Obi Wan Kenobi at least who has nice cape and beard pius cool photon sword.
Good choice but it may need 3.3R Rs if the TP2 is not easy to rise enough.
Now you are killing me. Stajo called me Obi Wan Kenobi at least who has nice cape and beard pius cool photon sword.
Good choice but it may need 3.3R Rs if the TP2 is not easy to rise enough.
Do you refer to change R2-3 3 ohms to 3R3 ohms?
Wich position 11,63: first stage?