Technics SU-V470 phono input capacitance

[White_Fox97]

Hi all, just looking for some input from people who actually know what they're doing. I was looking at the schematic for my new-to-me amp and was wondering what the input capacitance for the phono pre is. My first instinct is 1000 pF but I'm not sure at all. I've attached the pages which show the schematic (I tried to stitch them together using Microsoft ICE but couldn't get a good result, sorry). Thanks in advance for your help

 

[wparks]

Can't say I know what I am doing . . . (does anyone really?)
They do their level best to make sure you can't know. Not in the user manual specs, not in the service manual specs, (that I found free on Elektrotanya).
May somewhat depend upon the mystery "L101 and L102" device. Listed as Technics part# SLM1Z33, which was also used in the SU-VX500, maybe others, but no idea what exactly that part is.
Given this design includes MM and MC functionality, I'm guessing it's a decent design, but . . . I'll keep digging.

 

[wparks]

OK- I see, I think I found it. It's C105 and C106- for "EG" it's 82pF, for "others" it's 180pF (plus the 12pF at the input) so a total of 100pF for EG, and 192pF for others. USA would be others, so 192pF.





As a side note, I'd probably rip it out if it were mine, hotly debated, but considering you are already getting 100-300pF from your RCA cable, I don't like any in the input. But, this phono RIAA pre-amp is a dirt common single op-amp design of Japanese origin, that has been used about a million times because it is economical, and "good enough". It's pretty pedestrian, and there are a LOT better out there. Eventually, consider an external phono pre-amp, and I think you will be a lot happier.