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Re: You want to repost ..

Posted by Thorsten (M) on March 29, 2006 at 10:36:27

In Reply to: You want to repost .. posted by cheap-Jack on March 29, 2006 at 09:06:54:

Hi,

> ... the schematic of your nice project in DIYaudio using 2x12AX7
> with passive CCIR equalizatioin? Prabably best phonostage project
> for very limited budget.

Actually, that Phonostage uses ECC83 (12AX7) & ECC88 (6922/6DJ8) - one each. Given the extensive discussions on the subject of this Phonostage over at DIY Audio, the various PSU designs posted and further extensive discussions and experiences by those building, it is best to peruse the threads there:

http://www.diyaudio.com/forums/showthread.php?postid=335624#post335624

This is the original extensive thread, covering several possible PSU designs, several build experiences etc.

http://www.diyaudio.com/forums/showthread.php?s=&threadid=54534&highlight=

This is a thread about "scratchbuilding" the thing with a few false starts, usefull to know how to go about it....

http://www.diyaudio.com/forums/showthread.php?s=&threadid=30538&highlight=

Another possibly usefull (in the context) Thread, though it mainly concerns itself with a full function pre.

(Note, my posts under the Handle "Kuei Yang Wang")

Finally, the RIAA Schematic is here:

A recommended MC Phono Pre-Pre is here:

This can be supplied with some additional RC filters (100R/2,200uF/100R/2,200uF/100R/2,200uF) from a reasonably well regulated 12V Heater supply (LM317)

The HT PSU I PERSONALLY suggest is here:

It is only fair to point out that the current standard Cole Kit is development on from these public domain designs (so yes, there are many parallels, but equally several differences which give the "Cole" better performance) with a MC Stepup Transformer instead of the Solid State Pre-Pre.

http://www.diyhifisupply.com/diyhs_cole.htm

For the money I suspect a scratchbuild will take up a significant part of it (if made to look good) and will ultimatly be nearly as challenging as a scratchbuild LCR Phono.

Ciao T

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