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Phono Amp Spec’s

Hello 

Can someone please help me understand the following…

*Maximum Input Voltage
64dB = 5.7mV
70dB = 2.9mV
34dB = 180mV
40dB =  90mV
 
I would be using a Benz Micro Ruby ZH moving coil cartridge with this phono amp.  
It’s output is rated at .7mV@3.54cm/sec which I believes equates to .998mV @ 5cm/sec.  
 
1.  Am I understanding this correctly, that my roughly 1mV cartridge would be fine going into this 64dB MC input?
 
2.  Is there a way to know what would the dB overload margin would be with 1mV @1khz as well as the low, mid, and high frequencies going into this 64dB MC input?
 
Secondly,
I’m concerned about over driving/clipping the phono amp.
 
* Input sensitivity
64dB = 1.26mV
70dB =   .63mV
34dB = 40mV
40dB = 20mV
 
1.  Can you please help me understand how the input sensitivity of 1.26mV for the 64dB MC input relates to my Benz Ruby ZH with a roughly 1mV output.  
 
What exactly should this mean to me?
 
After suffering 5 major strokes, my memory of many things have been lost. So, if anyone could please help me better understand how the above spec’s would affect me, I would truly appreciate it. 
 
Best wishes,
Don
 
 
 
 
no_regrets
elliottbnewcombjr
6,021 posts
 

As part of this, can others who have solved HUM from SUTs please let us know what worked.

 

Thanks ahead of time

elliottbnewcombjr
6,021 posts
 

ChatGBT

https://chatgpt.com/c/68a718e6-1b10-832c-9d24-64c121295ddf

 

no_regrets OP
563 posts
 

@lewm 

Thank you for your reply!

At least I feel a little better now knowing that the overload margin will be 15dB with my 1mV cartridge going into the 64 dB gain setting of the Accuphase C-47 vs the roughly 10dB overload that I was fearful it might have been. 
 

I totally agree that some distortions with vinyl playback can come from other sources than just phono amp overloads.  Such as, groove wear, pressing qualities, recorded to hot, etc.  

I just didn’t want to risk paying out a huge cash outlay just to find out that the Accuphase C-47 wasn’t a good match for my 1mV cartridge, especially considering that this is a solid state design vs the all vacuum tube design of my current phono amp. 
 

So, do you think the 15dB of overload margin will be fine with my cartridge and the 64dB gain of the Accuphase?

I truly appreciate yours and everyone’s help!

Best wishes,

Don

lewm
13,825 posts
 

Yes I think so, but you’ll be the judge based on listening.

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