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RE: simple mods of Django tvc ....

Posted by Thorsten (M) on January 10, 2011 at 07:21:35

In Reply to: simple mods of Django tvc .... posted by squiffles on January 7, 2011 at 13:36:48:

Hi,

> 1.) The Plus Six dB Gain switch : this I will never use,
> ...
> If this is eliminated it looks as if some back & forth
> wiring to the selector switch could also be removed, and
> that would shorten the signal path on the important input side.

Yes, this would make some sense.

> 2.) The Rca / Xlr switch :

Only switches the ground pin on the XLR, look how it's wired. It makes no relevant difference to the RCA output.

> 3.) Source Select switch : if either or both of the above
> operations were in progress, it might be a very good time
> to install a shaft-extension for the Selector switch at the
> same time. Maintaining standard connections but bringing that
> device to the back of the chassis, eliminating wiring and
> getting switch itself to within about 10 cm of input jacks

It would remove a few inches of wire, remember, there are dozends of meters on the transformer itself.

> Anyone done similar, or have advice or ideas on any of this ?

TBH, I suspect what you hear was that 6dB (or so) ultrasonic peak at around 50KHz that all the MKI had, or rather the lack thereof in the MKIII. The big peak also produces a few factions of a dB high frequency boost at the top of the audio band.

I fitted Snubbers to my own MKI's to deal with that peak, switchable. On quick comparison listening I preferred the "unsnubbered" version, in the long run listening I preferred the "snubbered" version.

The Snubber went from the 0dB output to the Wiper of the switch, I have no idea what the values where though, optimised on the bench for flat response at 20KHz IIRC or some such.

The MKIII version has clever winding tricks to avoid the peak without adding stuff...

Ciao T

Thor

At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?

Edits: 01/10/11

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