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Old 27th August 2006, 09:56 PM   #61
VT67 is offline VT67  Belgium
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I'm also kinda interested in this project. For the last five years now I want to build me a 300B amp, got a lot of parts to do so but up til now I haven't deceided on which concept. I have two sets of 300B's, AVVT and Krone.

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Old 28th August 2006, 02:15 PM   #62
kmtang is offline kmtang  Canada
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Hi Peter,

Congratulations on your new born T-REX. That's something I want to build next.

Hi GeWa,

Suggest you to build Mono Blocs because it weighs less. The stereo one just way to heavy to flip over for service and modification.

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Old 17th October 2008, 06:09 AM   #63
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no more pic's????
when you burn it - burn it good
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Old 19th April 2013, 08:24 PM   #64
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I recently finished building the shunt-regulated T-Rex power supply for my existing C3m/300B SE amp . I might as well mention it on this (old) thread, as I picked up this discussion on a search when checking comments on the circuit .

Here's my main thread -
audio-talk :: View topic - Future plan for 300B XLS amp

I did quite a bit of LT Spice analysis when deciding whether or not to build .
Starts here : ( long )
audio-talk :: View topic - Valve Shunt Regulator Design Walk-Through

Overall it's been well worth the effort . It definitely beats the Series-regulated supply I had before . This was a Verdier/Thorsten style circuit with 6080 pass tubes and EF86 error amp , but with a substantial cLC supply up-front . This in turn was better than the cLCLC passive supply I used to use pre-2008 .

The new TRex supply has slightly better midrange than the series-reg . It has signifcantly better bass tone and bass timing than the series-reg . The whole bottom-end now sounds more like Class A PP , although the fluid and natural SE tone is retained .

Spice sims confirm that most of the AC return current path is through the KT88 cathode by-pass cap : make sure if you build that you put in the best possible cap here - I've just changed to a combination of a 220uF Elna Cerafine, plus an Audyn 2.2uF/100 film-foil cap here . This seems to be the best so far .
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