Question on Revox A77 tacho head

[zoky]

Hello to all!

I have a question to ask you: do you have Revox A77 in your home?
Here is a little question on the tacho sensor of the capstan, i'd like to know the dc resistance ohm value.
So, could somebody tell me how many ohms are there exactly on the tacho head of the capstan motor of a Revox A77?

Many thanks to all.
All best.
Ed

 

[thomasdf]

Someone wants to varispeed the **** out of a A77?

 

[RuudNL]

What is the reason for asking this question?
If you measure a DC resistance, the tacho head is good.
(In this case the exact DC resistance is not important.)

 

[musika]

Ed,

Here is a spec sheet on the A77 that describes the tape speed mechanism. Hope this helps.

I'd like to add input pads to my A77... has anyone done this?  It's a MK3 HS 2T with rca aux inputs. 

 

[abbey road d enfer]

I'd like to add input pads to my A77... has anyone done this?  It's a MK3 HS 2T with rca aux inputs.

What does this have to do with the tacho head?
How much attenuation do you want/need? The aux inputs accept up to 3.5Vrms (+12dBu)

 

[musika]

How much attenuation do you want/need?

Don't know they seem to be easily overloaded.

 

[abbey road d enfer]

How much attenuation do you want/need?

Don't know they seem to be easily overloaded.

Why don't you connect a dual 10k pot? then you can adjust to your liking.