Phono stage w/automatic Load-Impedanance.
All good points. Nevertheless, he wrote in favor of very extended bandwidth. I will try to find the quote; perhaps I mis-remembered. He might have been referring either to the linestage section of the RTP or to one of his amplifier designs. Anyway, his point was that although the roll-off was occurring at frequencies impossibly high by any rational analysis as regards any effect on the audio bandwidth, there was in fact an audible (to him) "trickle down" effect, because the roll-off created distortions down in the audio range. |
I have found that is true as well. If for example if that 50KHz step was really employed (and if I understand correctly, meaning that it goes to flat response at 50Khz), the ear will interpret the resulting phase shift in the audio band as brightness. The old MFA Magus preamp used to do this and it also sounded bright. I found that by restoring the RIAA curve at 50KHz eliminated the brightness. |
Dear all, after quite some time of using different phono stages from cheap Grado PH-1, iPhono2, to the great JLTi and finally Gold Note PH-1 i have to say the old WLM Phonata is really good. For some reason the WLM bass is addictive and none of my phono stages can do the same. Input resistors for MM carts has been upgraded to 100k Ohm Vishay Naked Foil last year. It was a huge upgrade and some of my favorite vintage MM cartridges are really really good with this phono stage. Well, i decided to upgrade Capacitors in my WLM Phonata Reference. Last year i took some pics of the circuit and realized the original stock caps are all German made Audyn. Constant upgrade is rule number one. Time to replace these Intertechnik Audyn MKT (Axial Metalized Polyester-foil) capacitors. Intertechnik manufacture High End Audio capacitors in Germany since 1983. As you can see my caps are 6.8 C/µF (160v) and 1.0 C/µF (250v) with 5% tolerance, they are very cheap. Right now Audyn offers much better audiophile grade caps. In the biggest capasitors test review i found that Audyn Reference, True Copper, True Copper Max and True Silver received the best verdict! I just bought Audin Reference caps, 4 of them cost me 170 euro with shipping. I’m thinking to upgrade stock built-in SUTs on the motherboard too. Looking for the right one from Swedish Lundahl (they made then since 1958). Actually my stock SUTs claimed to be Lundahl too, but they does not looks like any Lundahl i can see on the official website now. Here is a picture of the motherboard with stock SUT and stock caps that i want to upgrade ASAP. But which step-up ratio to choose? |
