Anyone got diagrams for the TL Audio VTC console please ?

[Kevin Stuke]

Hi Sam,

thanks a lot, you saved the easter audiorepairs

 

[S.Samuelsson]

Hi Kevin,

You're welcome, have fun .

Regards,
Sam

 

[THS-Studio]

Even though this thread is a bit older, there is a plausible explanation why TL-Audio removed the SSM2017 and used a well-known and proven input circuit instead. 1. In the SSM2017 circuit, the LineIn was fed to the "microphone input" via a simple voltage divider (40db 100 times). This is not particularly subtle, as the microphone preamplifier is only limited to 20 kHz for HF safety reasons, while the frequency response otherwise goes up to 40 kHz.
2. The SSM2017 and its successor, the SSM2019, had relatively high failure rates, particularly with long cable lengths, high capacitances built up, which "destroyed" the very sensitive SSM despite limiter diodes... The NE5532 circuit with the 4 input transistors was very robust in comparison...
3. In the new circuit, the Line IN input with 2x NE5532 has a completely separate path, but is sent back to the "microphone main path" before the impact sound filter and Pgase Reserve. Now with reasonable impedance - without voltage divider and cutoff frequency 40kHz. That is serious and much more professional than the SSM 2017 circuit. However, since the company had previously done a big advertising campaign regarding the TOP quality feature of the SSM2017 - but a rather unprofessional Line IN 1:100 attenuation - they had probably quietly corrected this error... Well - unfortunately, the company closed in 2012. Nevertheless, the VTC console is a dream in terms of sound for me personally... I have the 24-channel version and am really happy with it... The first circuit with the SSM2017 came out in 1999 - the revision with the NE5532 in 2003. My console is probably from 2006. There are also strange versions of the power supply. The circuit diagram shows 56,000uF unregulated electrolytic capacitors behind the rectifiers. But in my case it is only 22,000uF in the power supply. I will definitely modify that. My console has a signal-to-noise ratio of around -84 dB with 24 connected channels... That's a great value, slightly overlaid with a residual hum - which could be due to the not low values of the electrolytic capacitors.

 

[Kevin Stuke]

Hi – thanks a lot for the detailed explanation regarding the opamp changes – I definitely feel less bad about them now

Sorry for the late response – I have – fortunately or unfortunately depending on how you look on it been quite busy with the video side of my business as well as live mixing and didn’t get to as much Audio tinkering as I liked. But it is coming along, and I have already done first test recordings.

I may have googled your Studio and found out that we are both in Germany btw. It looks really cool and definitely reminds me of the need to improve my acoustic treatment

Also very interesting info regarding the Power supplies. I’ll definitely look into that. If you are upgrading your power supply anyway it might be worth replacing the fans – mine were extremely loud and since I don´t have a separate tacking room (or a separate audio room for that matter – it has to share the space with photography and video stuff) that was a problem. I´ve installed some much quieter Noctuas and that improved things al lot. I’ve also measured the Thermals to make shure that nothing will overheat – I can share the detailed records if you are interested

Greetings from Göttingen
Kevin

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