Schematic wanted for VTL Preamp "Maximal"

[tiefbassuebertr]

ask ZM

in case that you have one in front of you - you can send me missing values in phono feedback loop

By the first picture of schematic (RIAA-phono stage) I miss the device for the input capacity. Which value was inside as standard ?
Thanks for advice.

 

[Zen Mod]

speaking of post #2 , first (left) pic is line stage , while second (right) is RIAA

150p is drawn and noted as input capacity governor

plus Herr Mueller effect

 

[tiefbassuebertr]

speaking of post #2 , first (left) pic is line stage , while second (right) is RIAA

150p is drawn and noted as input capacity governor

plus Herr Mueller effect

Thank you, very much.

 

[tiefbassuebertr]

I am looking for images of the PCB, but the bottom view, so as the PCB layout.
Maybe this helps to avoid removing the complete PCB for troubleshooting, which is extremely time-consuming.
Thank you very much for upload.

 

[hooman]

A friend of me observe issues regard that - go to post #14 about
http://www.diyaudio.com/forums/anal...tion-broadcast-sw-stations-2.html#post3166962

Why don't you make preamps with tubes like ecl86....ecl84.... Manley can't be a professional in hifi. I had the chance to copy preamps from Japanese manufacturer many times. They are high end. And in Very expensive market. But you can build. Anyway, you can ignore it and go the old way.

 

[rayma]

Like them or not, Manley Labs must certainly be considered as professionals in audio.
They have been around for about 50 years, and have received very good reviews.

 

[tiefbassuebertr]

I am looking for images of the PCB, but the bottom view, so as the PCB layout.
Maybe this helps to avoid removing the complete PCB for troubleshooting, which is extremely time-consuming.
Thank you very much for upload.

in the attachment (first image) the bottom view.
In the second schematic of post #3 there are no values noted for the RIAA equalizing network. Who know the values ?

Any experiences concerning replace the present couple capacitors (VTL labeled) by this one from Jantzen Audio ?
http://www.jantzen-audio.com/superior-z-cap/
https://quint-store.com/media/files...dd066ec56d5db/Jantzen Superior-Z-Cap-List.pdf

 

[hooman]

Like them or not, Manley Labs must certainly be considered as professionals in audio.
They have been around for about 50 years, and have received very good reviews.

Thank you for your information. Professional hi-fi manufacturers never make studio preamps, mixers, and compressors...condenser mic .....

 

[rayma]

Manley has always done both.
https://en.wikipedia.org/wiki/Manley_Laboratories

Not that unusual, Shure also does.

 

[tiefbassuebertr]

in the attachment (first image) the bottom view.
In the second schematic of post #3 there are no values noted for the RIAA equalizing network. Who know the values ?

Any experiences concerning replace the present couple capacitors (VTL labeled) by this one from Jantzen Audio ?
http://www.jantzen-audio.com/superior-z-cap/
https://quint-store.com/media/files_public/75238661f2268347a6bdd066ec56d5db/Jantzen Superior-Z-Cap-List.pdf

In the attachment my own created schematic of the device in question.
Main difference which I note to VTL's genuine circuit diagram are between
1) - the values of caps in the signal pad labeled with VTL (1K/22K = 1nF/22nF vs. 0,1µF and 0,22µF in the second schematic of post 3) and
2) - the not present cartridge input load capacitor in parallel to the 47K5 resistor (150pF in the second schematic of post 3)

 

[tiefbassuebertr]

the marked values on caps in the signal pad (1K/22K - labeled with VTL) haven't to do with those in real life. = 100 nF
Follow values I note by measuring with multi meter:
1K = 100 nF (0,1µF)
22K = 220nF (0,22µF)

P.S.: I want to know, what kind of bypass foil capacitor is a good choice to solder in parallel to the 220µF (between cathode and GND) - taking into account the limited space ?

Either one decide on an MKS/MKT version with a higher value or with the same size for a lower value - but then with the higher-quality - i.e. MKP/FKP version (due the low voltage condition on that point a 63V version is enough).
Any experiences ?

 

[tiefbassuebertr]

concerning this model and the model "deLUXE" I have found the attached descriptions from VTL (excerpt from the book "THE VTL BOOK")

 

[tiefbassuebertr]

some images from various devices of this model

 

[tiefbassuebertr]

more images from various devices of this model

 

[tiefbassuebertr]

According internal images, the model "MAXLINE" is identical with the model "MAXIMAL" but without the RIAA-stage