RIAA using ECC88 tubes

[JoeAlders]

Hello ,
here are the measurements from my version .
Kind regards , Alexander .

Those Rohde & Schwarz measurements: software?

 

[Lampie519]

R&S is using NI Labview programs (VI / executables) in their equipment. VI stands for "Virtual Instrument"

 

[JoeAlders]

R&S is using NI Labview programs (VI / executables) in their equipment. VI stands for "Virtual Instrument"

So, very very expensive measurement instruments!
Far beyond my budget

 

[Lampie519]

I was working for NI 15 years ago as trainer and AE. Nice stuff but a little over the top for the hobbyist. I still like to use my old trusted Philips scope and some data aquisition tools together with “Sigrok”.

sigrok

 

[RE 604]

I am also only a hobbyist , but with the luck , to get some instruments for free or as a swap for other stuff . The only new part of my equipment ist the Keysight DSOX1202G .
Kind regards , Alexander .

 

[JoeAlders]

Jeeezz man, looking at that picture : am I envying you!

 

[Lampie519]

I am not a collector of measurement equipment ha ha. But sure it looks cool on the workbech !

 

[pl802]

Oh that's the Chris Found phono preamp.
So you did not get his follow up article?

 

[JoeAlders]

Oh that's the Chris Found phono preamp.
So you did not get his follow up article?

If you are addressing to me : no I did not. Where can I find it?

 

[pl802]

It's in Hi-Fi World Supplement No.35 February 1998.
Hope that helps.

 

[JoeAlders]

It's in Hi-Fi World Supplement No.35 February 1998.
Hope that helps.

Tried to find a copy on the internet but failed (have to pay for it on ebay).
Is there another source where I can find it?
Thanks in advance.

 

[Lampie519]

Is it not the circuit from entry #1 ?

https://www.pearl-hifi.com/06_Lit_Archive/14_Books_Tech_Papers/Found_Chris/Cascode_Tube_RIAA_Pre.pdf

 

[pl802]

Sorry lads I was not ignoring you.
My camera is refusing to shake hands with my laptop...flipping windows10 is doing my head in.
Anyway the heater PSU was completely reworked....
That's from my phone ugh!!!!

 

[JoeAlders]

Is it not the circuit from entry #1 ?

https://www.pearl-hifi.com/06_Lit_Archive/14_Books_Tech_Papers/Found_Chris/Cascode_Tube_RIAA_Pre.pdf

yes, but it is only the circuit diagram not the "story".
That's given in the link you supplied, thanks for that.

 

[JoeAlders]

Is it not the circuit from entry #1 ?

https://www.pearl-hifi.com/06_Lit_Archive/14_Books_Tech_Papers/Found_Chris/Cascode_Tube_RIAA_Pre.pdf

Sorry lads I was not ignoring you.
My camera is refusing to shake hands with my laptop...flipping windows10 is doing my head in.
Anyway the heater PSU was completely reworked....
That's from my phone ugh!!!!

I have to do some picture processing to read it

 

[pl802]

Another go at it!!

 

[JoeAlders]

Hello ,
if I find my PCB , I will do some measurements .
Kind regards , Alexander .

Did you design the PCB yourself or is there "out on the internet" already a PCB of that design available?
Although for me it was a bit of a puzzle to interpret but your measuring results look good

 

[RE 604]

I think the PCB was in the supplement from February , I will search it .
Kind regards , Alexander .

 

[JoeAlders]

Hello ,
if I find my PCB , I will do some measurements .
Kind regards , Alexander .

I think the PCB was in the supplement from February , I will search it .
Kind regards , Alexander .

Thank you in advance Alexander!

 

[metanastis]

Using the NI simulator 12.0 the result was approximately 2,4Volts output for 4mVolts input.The THD was 0,037%.