Keith Cooper mentioned today the AllnicAudio’s 1500 phonostage in the Cessaro thread…
I know the AllnicAudio, I use their tube sockets, and they are very good. The AllnicAudio uses a pair of 417A for their phonostage. I am not a big fun of those tubes and 600R load for those little pentodes is too much but still it very much might be a good phone corrector.
The AllnicAudio in thir web site point out some shortcomings of different correction topologies – very superficially and they are not completely correct unfortunately. Regardless of it the subject of the LCR EQ is very interesting. I have one and I do like it a lot, although my personal “reference” corrector is not the LCR type.
Thorsten have eaten a dog on the LCR subject and his 7788 corrector was very good. I changed it for 7788-7721 and it was even better. I heard that Thorsten made the 10K LCR filter that should be very interesting but I did not follow the subject very close for years and I found “other solution” to deals with the problem of the constantly recharging feedback capacitors.
Another attractive company did a few years back a very interesting LCR phonocorrectors. It was the DaVinciAudio from Switzerland. In their initials version it was very cool but I heard nowadays they went for it’s commercial version, hugely simplified….
I still generally very welcoming the LCR correctors, I wish it was more of them. There are a dozen companies about which I heard that do them. The Thorsten’s approach with 7788 at input is the more appealing to me (7788 has better sound and lower noise, particularly if to play with screen’s supply) but the 7788/E810F is not a tube that have any mass-commercial potential and therefore it is overlooked by the manufactures who dream to become a second BAT.
Anyhow, here is the Korean’s AllnicAudio attempt around the 417A/5842… I wonder if they paralleled the input tubes to drive the low impedance LCR filter?
Where are those 80dB of gains with my 2 stages only????!!!
"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche