[woodcans]

for (high power) tube amps it is recommended to always have a load, i.e. loudspeakers connected to the output transformers, or the energy stored in the transformers is reflected to the anodes so possibly damaging the tubes. in fact i change headphones while the amp is on, but turn the volume level to zero before, never faced any problem.

 
 
GG, this is with your tu-05? Thanks in advance.

 

[GermanGuy]

Yes, with my tu-05 i change headphones while switched on.

 

[Sam Edwards]

My TU-05b has been in customs in LA for over 24 hours. Any idea how long these things take?

 

[xplosive]

  My TU-05b has been in customs in LA for over 24 hours. Any idea how long these things take?

As long as they need to find out that it is not a bomb then they will let it go..

j/k i hope you will get your precious tu05 today..
 
Just want to confirm that df96 tubes are not suitable for my tur06 ( i dont't know with other tur06. As GG said they need lc filter to make it works. But i am not sure whether the lc filter will make sound more muffled. Hopefully not.
 
I mentioned in my previous post that df96 philips works well in my tur06 but it turns up i was wrong. I was accidentally mix the it4 philips tube with the df96 philips tube. And It works beautifully with almost no background noise.
 
Same case with my df96 telefunken diamond base until now they still make a buzzing sound. So my solution is tried to mix them with my other it4 tubes. And it comes out with silvania tube on left channel (vocal and detail), and telefunken df96  for the right (bass rumble and ambiance). It is not as perfect as using tele on both channel but it works pretty balance and sound good to me (at least until i get the lc filter fitted).

 

[GermanGuy]

@explosive - i posted possible solutions in my post answering AnakChans questions.
 
the buzzling sound is caused by the internal power supply (too low current), if you combine the DF96 with an 1T4 in fact you increase the power demand from 50mA to 75mA current needed so the internal power supply remains stable.
 
so after having add a lc-filter add-on everything is fine again because the improved lc-filter is designed to maintain stability of the internal power supply even with lower current needed than in the official spec / tubes list.
 
the LC-FIlter is in the power path and only for filament voltage, the signal path will NOT be changed.

 

[xplosive]

Thank you GG for your explanation. Is there any harm made to the tube or the amp itself if i mixed the it4 with the df96? or it will just make my battery run out faster? I kinda like the sound from this combination. But still I will get the lc filter as soon as possible.

 

[GermanGuy]

no problem, just mix them as you want (as long the tubes are of the types listed (1T4, 1U4, DF904, DF91, DF96, 1T4T, 1T4SF, DF92 works fine in my tu-05).

 

[GermanGuy]

Found a German Company (posted in a colorfly c4 thread) Mr. Horwege from "Hifi-Werkstatt hoer-wege" that will modify my Colorfly C4 by changing components and capacitors, reworking the complete analog path for (proven by other customers) even better resolution, fine detail, and clearly improved bass quality. the complete modification is 160 Euros and will be done next week! So the whole chain gets better and better ..... thinking and thinking at the moment about the Meridian Director... but i think waiting for SamEdwards impressions listening to the AK240 in comparison to the AK120 + Meridian Director (think he has posted that he want to listen to this two combos in the SoCAl Meet thread).
 
@SamEdwards - hope US customs release the TU-05 ASAP and in time for the SoCal Meet !

 

[smial1966]

GG,
 
Please post a link to Mr. Horwege webpage or contact details as my friend has a C4 and I'm sure that this relatively low cost `upgrade' would interest him.
 
Many thanks.   
 
Quote:

  Found a German Company (posted in a colorfly c4 thread) Mr. Horwege from "Hifi-Werkstatt hoer-wege" that will modify my Colorfly C4 by changing components and capacitors, reworking the complete analog path for (proven by other customers) even better resolution, fine detail, and clearly improved bass quality. the complete modification is 160 Euros and will be done next week! So the whole chain gets better and better ..... thinking and thinking at the moment about the Meridian Director... but i think waiting for SamEdwards impressions listening to the AK240 in comparison to the AK120 + Meridian Director (think he has posted that he want to listen to this two combos in the SoCAl Meet thread).
 
@SamEdwards - hope US customs release the TU-05 ASAP and in time for the SoCal Meet !

 

[GermanGuy]

http://www.hoer-wege.de/
 
HiFiWERKSTATT hoer-wege
Stephan Horwege
Gallberg 40
28790 SCHWANEWEDE
Deutschland / Germany
 
hifiwerkstatt@hoer-wege.de

 

[GermanGuy]

the modder's diary (don't remember the last number, so let's restart with 30) part 30:
 
thinking of what to do next and tired of always carying my equipment with me from and to the office, i thought it is time for a tu-05 rebuild for my office:
 

 
tube section and output transformers:
 

 
here with most of the components:
 

 
i think i will call this rebuild "SilverStar I" (any better suggestions?) as there are a lot of silver shining components, and it will have a central ground star topology.
 
the resulting amp will be a little silver cube:
 
- no battery needed
- with integrated HRT MicroStreamer USB DAC
- the hole amp will run completely with USB power
- only one USB port needed
- any USB power supply or USB power pack can be used
 
in the office you can just plug it in an USB port of your computer and listen to the music stored there!
 
as you can see a lot of power filter stages added, only the best components (WIMA MKP10 capacitors, mica capacitors, ELNA SILMIC II and NICHICON MUSE electrolyte capacitors and shielded, gold plated tube sockets). The pcb prototyping boards i use for this and will use for all the other builds i have planned are RF/HF prototyping boards, very expensive, but double layer with a complete GND layer one the top side.
 
the output transformers are really small, silghtly less good sounding than the original ones, BUT with very large impedance range, can drive anything from 4 ohm to 2 kOhm (and so for example also my HD800 or even a Beyer T1).

 

[CJG888]

Just supposing this were to go into production, what would you expect the price to be?

Will laptop USB power really be enough to drive this?

Looks very interesting...

 

[Sam Edwards]

My TU-05 is here! 
At a first blush with stock tubes I am absolutely blown away. Couldn't be happier. 
Right now I'm listening to high resolution flacs through the Meridian Explorer > TU-05b > Ultimate Ears Reference Monitors. 
I'll try with the Meridian Director and the Grado RS-1 and HD800 tomorrow at work. 
Thank you all for raving.
It's truly a beautiful sounding amp. 

 

[xplosive]

@GG really interested on your SilberStar I. I prefer that in German word..

With those best components I am afraid for the price though...
 
@Sam Edwards Congrats on your tu05b. Happy listening!

 

[GermanGuy]

@Sam Edwards - really happy that you finally got the amp and you like it, wish you a lot of relaxing listening hours and a great SoCal Meet!