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Old 3rd June 2013, 04:20 PM   #811
Desmo is offline Desmo  Denmark
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Quote:
Originally Posted by kazap View Post
Thanks for your expert help once again. I didnt know the volume control is built around the DS1666
You did know it says in Clives review that you linked to... That's where I got the info from...
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Last edited by Desmo; 3rd June 2013 at 04:25 PM.
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Old 3rd June 2013, 04:25 PM   #812
Desmo is offline Desmo  Denmark
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Originally Posted by ptashton View Post
Morten, a link to the phonodude circuit. http://dddac.de/pics/phonodude/pd-circuit2.gif

I have changed from Normal to shunt on the Tram2 and will be firing it up after my son watches 'Star Wars the Clone Wars' on TV.

Peter
Thanks for the info, I have used the Phonodude circuit some years back, so I know it well.

Regarding shunt mode... As Bjarne mention you must move the two jumpers from ''normal'' to ''shunt''. When that is done the preamp should work normally, volume going up/down.

With the standard 100K series resistors used in shunt mode I think that it's not a sonic benefit to use shunt. But replace the standard resistors with a pair of 100K Shinkoh tantaliums, Vishay naked Z foil or what ever you prefer, and (IMHO) the sound is better in shunt mode.... And no risk of clipping the input signal...
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Old 4th June 2013, 05:58 AM   #813
kazap is offline kazap  Australia
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Quote:
Originally Posted by Desmo View Post
it says in Clives review that you linked to.


Quote:
Originally Posted by Desmo View Post
replace the standard resistors with a pair of 100K..
I wonder if there might be a photo I can follow? Im not so good with words.
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Old 4th June 2013, 06:34 AM   #814
Desmo is offline Desmo  Denmark
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Quoting myself again


Quote:
Originally Posted by Desmo View Post

Click the image to open in full size.
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Old 7th June 2013, 08:09 AM   #815
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Morten, in shunt mode, it solved my dilemma of the high output of the phono stage. Very nice. No distortion in the vocal range. I was getting more hiss from the -3dB output so I dropped the output connection to reduce the hiss. I will be installing Rod's regulators soon. I will have to get better 100k resistors now. Thanks

Peter
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Old 7th June 2013, 11:21 AM   #816
Desmo is offline Desmo  Denmark
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Good to know Peter, this is proof, that you had clipping of the input signal in the volume IC... In shunt mode the signal does not go through the IC, hence no clipping limit...
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Old 8th June 2013, 12:41 AM   #817
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Morten, what were the 100k resistors you used in shunt mode. The picture you had up is gone. Thanks

Peter
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Old 8th June 2013, 04:45 AM   #818
kazap is offline kazap  Australia
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Peter
As Morten gets so may requests to repeat himself from me Ill try to help out with links: Morten's old post with the shunt mod_photo using the

Vishay naked Z foil 100 kOhm

Click the image to open in full size.

at USD56 for the pair they must be special?

"These are the very best Vishay resistors made for audio...in fact, they are the highest technology resistors on the planet ! In their short 18 month existence, they have gained quite a reputation for neutrality, resolution, low level detail, etc... "

I want to go green and try some carbon sink resistor to save greenhouse warming:
KIWAME
2 Watt Carbon Film Resistors



Click the image to open in full size.

USD2:20 a pair

Last edited by kazap; 8th June 2013 at 05:03 AM.
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Old 8th June 2013, 09:13 AM   #819
Desmo is offline Desmo  Denmark
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Originally Posted by kazap View Post
Peter
As Morten gets so may requests to repeat himself from me
Ha ha... Yes, you are the expert on keeping me busy in this thread

Personally I would not use the Kiwame (or any other carbon resistor) for this application. If you don't want to buy high quality transparent sounding resistors I recommend to stay with the ''standard'' setting of the volume control, it will sound better. Having a large 100K resistor directly in the signal path, the sonic foot print of the resistor will be very evident. Therefore it's one of the most critical parts of the signal path, as critical as the capacitors in the signal path.

The only alternative I would consider are the Shinkoh tantalium, these are cheaper than the Vishay naked Z foil if 50 $ is too much of an investment...
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Old 8th June 2013, 09:32 AM   #820
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From: DHT OTL Linestage - Tram 2

All members who want to use the "holy grail" audio resistor,

the TX2575 Naked Z-Foil,

could order it direct from Arbie Lopez at Texas Components.

alopez@texascomponents.com


That´s the cheapest way to get it IMO.

They have also great Trimpots with Bulk Metal Foil Technologie.

Peter
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