VTL Schematic needed

[Burnedfingers]

Anyone have a schematic for a VTL ST-85 amplifier? I have contacted VTL and they won't give me one.

 

[smoking-amp]

Googled it:

https://www.google.com/search?q=vtl...t%2Fchemo%2Fattivita%2Fvtl7575.html;2338;1650

 

[Burnedfingers]

I see a hand drawn schematic for the 75 but nothing for the ST-85. Is it the same?

 

[Zen Mod]

most probably close enough

 

[neandertal]

Hello,
I just have "painted" a circuit diagram about the vtl st-85 https://www.dropbox.com/sh/dwx3uhbl...eX_qs5aZt9Ra/20 Schaltplan VTL St-85.jpg?dl=0
may be too late for you
best regards, frank 🙂

 

[mbrennwa]

Hello,
I just have "painted" a circuit diagram about the vtl st-85 Dropbox - Error
may be too late for you
best regards, frank 🙂

Sorry for necrubumping, but I am also interested in a VTL ST85 schematic. The dropbox link does not work anymore. Does someone have a schematic that could be uploaded here?

 

[analog_sa]

Same hand-drawn schematic

 

[mbrennwa]

Same hand-drawn schematic

Thanks a lot!

The 590 V B+ seems rather "hot" for the EL34 tubes. Is this how VTL does things?

Also, what's the purpose of the 200k pot on top of the second ECC81? Balancing the symmetry of the phase splitter outputs? Is this pot a set-and-forget thing, or does it make sense to tweak this setting when the driver tubes are replaced (or when they are aging)?

Any other insights or hints related to servicing this amp?

 

[petertub]

Same hand-drawn schematic

Clueless maker refusing to give customers schamatics. Result ? People reverse-engineer and publish the schematics .


Idiots ( VTL )

 

[obseedian]

590V on the screens, pentode mode, even on a kt88 should be a criminal offense.