Schematic wanted for VTL Preamp "Maximal" - diyAudio
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Old 15th January 2010, 11:59 AM   #1
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Default Schematic wanted for VTL Preamp "Maximal"

For this preamplifier I need schematic diagram
I don't find a download aera about
Music creates the dimension
and
Manley_Laboratories_Hi-Fi_Main_Page
perhaps one of you know, where I can ask - thank you very much.

in the attachement some pictures of this preamp:
Attached Images
File Type: jpg VTL_Maximal_Pre.JPG (65.2 KB, 626 views)
File Type: jpg VTL_Maximal_Pre-II inside.JPG (117.4 KB, 591 views)
File Type: jpg VTL_Maximal_Pre-II.JPG (87.3 KB, 565 views)
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Old 15th January 2010, 04:26 PM   #2
kevinkr is offline kevinkr  United States
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Have you checked with VTL? Manley Labs and VTL are completely separate companies now.

I can't tell from looking at it whether you have U.S. built VTL product or an earlier U.K. built VTL product. Unfortunately I no longer remember which models were made where either.. (It's been at least 10yrs since I last worked on a VTL product.)

You might have to ask their service department directly for a schematic.

Edit: I have to say looking at the inside shots it doesn't look much like the U.K. made products I saw which had excellent build quality.
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Last edited by kevinkr; 15th January 2010 at 04:30 PM.
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Old 15th January 2010, 05:33 PM   #3
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by tiefbassuebertr View Post
.......
perhaps one of you know, where I can ask - thank you very much.
.....
ask ZM

in case that you have one in front of you - you can send me missing values in phono feedback loop
Attached Images
File Type: jpg maximal-line.jpg (44.3 KB, 548 views)
File Type: jpg de-luxe.jpg (79.1 KB, 546 views)
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Old 15th January 2010, 10:21 PM   #4
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Thank you for your comments and the schematics. This preamp was ordered arround 1990 by tube audio professional
tube audio professional [Atelier Rainer Roeder]
in a modified version (only cap devices in enhanced quality against the serial caps - not changed/modified circuit topology)
I know, that Manley Labs and VTL now are completely separate companies (look at my webaddresses at post #1)
But in those aera, where this preamp device was developed, David Manley works still yet for VTL and he was also the developer of VTL's "Maximal" - so I think.

But neither VTL nor Manley Labs can send me the schematic or an according download aera some months ago. This was the reason to start this thread.

If you see by photo of inside view (solder view of PCB), the missing values in phono feedback loop I can send you only, if I dissass'y the main PCB complete - there are connections between the rear outsite pannel and PCB about the cinch (chynch) female connectors (only approximately 5mm distance) !!! The most devices are between the PCB and rear panel and I want definitely to avoid to disass'y this worse mechanical design.
If I have a complete schematic so as a assembly arrangement and PCB layout/insertion printing, then I can introduce a interface for an outdoor power supply without remooooove the main pcb from the enclosure.

Who is ZM ??

Last edited by tiefbassuebertr; 15th January 2010 at 10:25 PM.
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Old 15th January 2010, 10:38 PM   #5
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally Posted by tiefbassuebertr View Post
......
Who is ZM ??
who else than : http://www.diyaudio.com/forums/members/zen-mod.html

in any case - if you ever stumble upon these missing values , don't forget me ...

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Old 15th January 2010, 10:42 PM   #6
SY is offline SY  United States
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Quote:
Originally Posted by Zen Mod View Post
ask ZM

in case that you have one in front of you - you can send me missing values in phono feedback loop
It's pretty much a 45 year old Dynaco PAS circuit dressed up with a nice front panel. The values from that would work fine.
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Old 15th January 2010, 10:53 PM   #7
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tnx SY - I need them just for record ..... to write them in my ancient VTL Book
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Old 16th January 2010, 10:20 AM   #8
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Quote:
Originally Posted by Zen Mod View Post
who else than : http://www.diyaudio.com/forums/members/zen-mod.html

in any case - if you ever stumble upon these missing values , don't forget me ...

Ok. ZM = abbrevation of "ZEN MOD" - that was new for me (I cannot mind all abbrevations over this world).
I have found a hand sketched part of the circuit and I recall, that I have measured the resistance DC values in order to avoid the disass'y of PCB.
Since you are professional electronic man, it is easy for you to calculate the values for the capacitors according to receive the appropriate RIAA equalizing frequency response
Attached Files
File Type: pdf VTL Maximal RIAA.ckt.pdf (7.4 KB, 242 views)
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Old 16th January 2010, 10:52 AM   #9
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tnx
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Old 16th January 2010, 04:06 PM   #10
tvrgeek is offline tvrgeek  United States
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Yes the circuit is simple looking, but their sonic quality was in the execution. Very careful attention to detail. Chassis design was for sound, not ease of repair. Probably some mount of justification for the price as well. If I remember, they were horribly expensive. Compare a PV-5 with a PAS-3. Again, execution.
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