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-   -   DHT OTL Linestage - Tram 2 (http://www.diyaudio.com/forums/diy-hifi-supply/156854-dht-otl-linestage-tram-2-a.html)

Desmo 31st January 2013 12:49 PM

For some reason it's not easy to get the message across, everyone seems to focus on the noise performance only. So I will continue to repeat myself on this:

The sonic improvement with the Rod Coleman DHT regulators is bigger than any other upgrade I have made on my Tram II, including the Full Music 2A3 SE tubes. I even think the sonic improvement with the Rod Coleman regulators is bigger than all the other upgrades combined, especially if the small upgrade with a cap+resistor on the regulator module is made. The better noise performance is just a bonus...

kazap 31st January 2013 12:54 PM

Message received. Coleman regulator order is going in now. Thanks.

beardman 3rd February 2013 07:11 AM

Hej Morten
Must try the fixed resistor tips....mine Tram drift a lot like yours,,
Thanks Bjarne

Desmo 3rd February 2013 07:48 AM

Hey Bjarne,

It's an easy small modification to do, you just have to get the value of the resistor very precise to get the anode voltage right... Or do like I mention with a 10 ohm multiturn trimmer and a fixed resistor in series...

beardman 3rd February 2013 07:52 AM

Hej Morten--
at first i will try with the fixed resistor--try to do it in the evening
best Bjarne

beardman 3rd February 2013 04:50 PM

ufff no resistor in my stock..must buy some ..
not only the noise,but also the sound get better ,when the proper adjustment is made
Bjarne

Desmo 3rd February 2013 09:23 PM

You better buy several values Bjarne, with the fixed resistor arrangement you have to get the value VERY accurate... So get some different values, also for some parallel couplings, for instance like I have 82 ohm // 2K2 in one channel...

Yes, the sound is clearly better when the anode voltage is ''in the zone'' than when it has drifted too low...

beardman 3rd February 2013 09:39 PM

Thanks Morten...
do you use some resistor with low temp. drift ?low ppm
i will order a 10ohm pot also
Best Bjarne

Desmo 4th February 2013 07:12 AM

I used standard 1% metal film resistors that I had in my resistor box...

Cheers,
Morten

marybety 4th February 2013 03:10 PM

My Tram MK2 for SALE in Germany. Assembled and working.
I think I can save time and words about the sound descriptions.
Pictures and Price only to private email addresses.
I will include a pair of (not assembled) Rod Coleman regulators.
I am moving and need to sell my whole rig.
Offer and buy with confidence I have recently sold my Hypex NC400 amps through this very website. I have as well positive marks in Audiomarkt and Ebay.


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