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Analog Squared Paper Discussion Thread. - Page 198

post #2956 of 3712

the modder 's diary part 14 1/2:


instead of testing my latest tube section i today reassembled the tu-05 to after a long time enjoy the quality of this amp and listen to some music.


i tried to drill some larger holes into aluminium, but my home equipment is much to light to do that. trying to drill a hole larger than about 10 mm (aluminium 3-4mm thick) will result in resonances of the bench drill and drill, the result is not a hole but something like modern art.


so no aluminium base for the tu-05.


but nevertheless i took the chance to


- completely recable the existing tu-05 using LCOFC copper wires and cables

- improve ground and the ground lines

- improve shielding of the different signals from each other

- implementing a center ground and protective ground


i implemented this using an idea i had for the build of my medium and high end versions to shield the wires and signals not only with the cable shield but using brass tubes as channel for the signal wires with the brass tubes connected to protective ground:


Read more: (Click to show)

This is the input cable (4 wire lcofc copper left/right/GND/GND twisted pair with shield) and the brass tube i cut to fit the size needed to be mounted on one side of the tube section providing one hole for the left channel wires:



i soldered the cable shield to the brass tube so after connecting the brass tube to protective ground you have an excellent shielded input path with signal ground for both channels (of course this is no double mono amp, but it's always good to have as much ground lines as signals).


here you also can see the brass tube i cut for the filament / heater cables switch (power save / 1s4 compatibility):



in a specific way it looks more like a detonator than an input cable :-).


here you see the output side of the tu-05 where i used 4 lcofc speaker wires (2.5mm diameter each):



the small black box (not blackbox) is the bias battery i mounted directly on the tube section as near as possible to reduce cable length.


here you see the two brass tubes mounted, on top the filament power wires shielding tube. i soldered both tubes to the main ground line, so the two tubes and the ground line together form one single large center ground:



as i had to put the cables into the tubes before soldering, the result looks not that professional, but didn't want to damage the wires with too much heat:




another benefit is that the tubes hold the cables in place, so much more stable than just soldered, no chance of cable break near the soldering points now.


at the moment i am listening to pink floyd - the wall - with the colorfly c4 using my grado style headphone and the tango output transformers connected to the tu-05.


sound? as far as i remember (if i can remember) - i have the feeling that especially the bass texture, depth and impact is improved, also there is so much air around anything, so spacious, PRAT to use this abbreviation, precision, bite, everything is there (have to report this to headphonia) (btw using the RFT DF97 / PHILCO 1S4 combo as usual).


sound seems slightly warmer, maybe due to the lcofc copper wires, as posted before i will use mundorf silver/gold wires for the df91 stages and lcofc copper for the dl92 stages in my final builds.


what a great amp.

Edited by GermanGuy - 1/1/14 at 3:51am
post #2957 of 3712

have to add something - having switched to the axmann axiom III pure silver cable to connect the c4 with the amp, it can he heard an i must say that the sound is not warmer but richer and fuller AND hyper detailed, the micro details and the texture are really improved, imaging and localisation are superb! will definetely go the central ground in general and the silver way for the input stage.


as short summary a good shielding and a center ground are highly recommended (and of course high end output transformers), further soundstage width / depth improvements may have to wait for the double mono implementation.

Edited by GermanGuy - 12/19/13 at 7:04pm
post #2958 of 3712

as the tango output transformers have a much lower possible lowest frequency than the original ones i coudn't resist to modify the amp and change the coupling capacitors, so now the amp should have a frequency responce down to about 20 Hz and the only thing i can say now again listening to pink floyd - the wall - is WOW!


excellent linear bass extension, deeper, so ... real, clear, precise, and deep, perfectly complementing the sound, i am once again in heaven!


P.S: have to measure this to prove it not to be a victim of just imagination :-)

Edited by GermanGuy - 12/19/13 at 6:42pm
post #2959 of 3712

at the moment i am listening to la folia de spagna - the sense for the space, the pinpoint localisation - i am floating down my chair like molten cheese. i think what is really improved is the overall presentation as a whole, like being transferred to the audience, absolutely relaxing. i don't know how to say, quiet and clean. it's like an excellent high end chain (okay i think it is), where you can't hear the equipment but just music.

post #2960 of 3712
Amazing, GG.
post #2961 of 3712

i love it to verify a sound impression or just listen to some music directly as first action in the morning, your ears are in perfect condition at this time. so to verify my impressions i posted yesterday i listened to the same tracks as yesterday, but also some minimal techno, paul simon, ricky lee jones, bach - toccata und fuge d-moll and now i am sure that the improvement is real.


the clarity, coherence and the improved bass depth and quality are amazing (have to verify the reasons - lcofc cables, better shielding, better ground and ground lines, output transfomers, the sum of all?!).


to come to a result within my holidays i have decided to start working on a complete build with the tango transformers using my best of best components, the only open point is the power supply to be provided, have to check this battery store in munich and my bank account.


the main problem before starting such a build is that you have to have the housing / case so that you know where to place all the components, where to integrate the switches, the volume pot etc.. but i just solved this problem and have ordered the case i will assemble an amp into - see my next post and hopefully be amazed!

Edited by GermanGuy - 12/20/13 at 10:01am
post #2962 of 3712

This is the housing / case i just bought - size is 38.2 x 26.5 x 17.7cm:



CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90




More pictures: (Click to show)


CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90


CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90


CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90


think of the left and right channel tubes glowing through the two front windows, a volume pot in the middle instead of the hygrometer, it looks stylish, easy to drill holes into, the amp can be integrated by just inserting one plate for all the switches, the components assembled on the same plate (rear side), very short connections between all components, ..... would be interested in your opinion.

Edited by GermanGuy - 1/1/14 at 3:49am
post #2963 of 3712

double post deleted!

post #2964 of 3712
Originally Posted by GermanGuy View Post

This is the housing / case i just bought - size is 38.2 x 26.5 x 17.7cm:



CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90




Warning: Spoiler! (Click to show)

CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90


CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90


CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 90







Unlock for tube rolling! I like it!!

post #2965 of 3712

this is what i call timing! just while typing the parts i ordered to proceed during christmas arrived:



this includes parts


- to test and possibly build a discrete power step up converter and voltage stabilization board

- 24 tube sockets with round holes

- a lot of connectors to connect pcbs or cables to a pcb

- a lot of capacitors, good quality but much smaller than the ones i used up to now

- operational amplifier and timer ICs

- high voltage capacitors

- wires

- different soldering fluxes to test soldering with this lead-free mundorf supreme silver/gold solder

- new resistors and vishay capacitors for the amp

Edited by GermanGuy - 12/20/13 at 10:03am
post #2966 of 3712
Hey GG,
At the rate you're going I'll be able to get a GG Amp before my TU-05 arrives (now delayed until February).
post #2967 of 3712

but only with DHL US priority mail :-)

post #2968 of 3712

anyone one knows why the tubes light up right away and NEVER get hot?

post #2969 of 3712

the tubes are battery tubes not getting even lukewarm. all the light comes from the LEDs mounted in the tube sockets!

post #2970 of 3712

i don't want to forget to in time wish all of you a





edit - typing error corrected!

Edited by GermanGuy - 12/20/13 at 12:11pm
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