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# Analog Squared Paper Discussion Thread. - Page 199

Quote:
Originally Posted by GermanGuy

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

Yeah, but i always had the impression tubes need to get warm to use of any use. Is the way these amps are made different? what do the tubes contribute? enlighten meplease.

not the tubes -  the tube filament / cathode heater section has to get hot to be able to emit electrons.

but as the filament / cathode heater of the DF91 / DL92 itself is

- low voltage and that small

- designed and optimized for low voltage - high electron emission rate

the generated overall heat is really small:

- a DL92 needs 1.4 volt x 0.1 ampere = 0.14 watt

for comparison:

- an  EL84 needs 6.3 volt x 0.76 ampere = 3.78 watt

- a    KT66 needs 6.3 volt x 1.27 ampere = 8.00 watt

- a    (let's call it HP30) 30cm x 30cm standard electrical heating pad needs about 60.00 watt

- a    (let's call it HP19) 19cm diameter electrically driven hotplate typically needs 1000.00 watt

if you see the heat produced in relation to the area the heat is generated

- about 2cm x 2cm for a DL92 or other tube

- diameter of an DL92 is 16mm

the heat dissipation per square cm is proportional to and something like

DF91   - 0.013 watt

DL92   - 0.025 watt

HP30   - 0.066 watt

EL84   - 0.945 watt

HP19   - 1.980 watt

KT66   - 2.000 watt

maybe this explains why the DF91 / DL92 tubes are rather cold while other tubes like the EL84 or KT66 are really hot!

Edited by GermanGuy - 12/20/13 at 12:02pm

double post deleted - don't know why this happens starting today using the full screen editor!

Edited by GermanGuy - 12/20/13 at 9:45am

Cool. Thank you. I was beginning to think the tubs were just for show.

my usual christmas and new years movie list:

We're No Angels -  http://www.imdb.com/title/tt0048801/?ref_=fn_al_tt_1

# Little Lord Fauntleroy - http://www.imdb.com/title/tt0081062/?ref_=fn_al_tt_1

The Muppet Christmas Carol - http://www.imdb.com/title/tt0104940/?ref_=fn_al_tt_1

Don Camillo - http://www.imdb.com/title/tt0043918/?ref_=fn_al_tt_7

Il compagno Don Camillo - http://www.imdb.com/title/tt0059049/?ref_=fn_al_tt_1

Dinner for One - http://www.imdb.com/title/tt0121210/?ref_=fn_al_tt_2

Murder at the Gallop - http://www.imdb.com/title/tt0057334/?ref_=fn_al_tt_1

Murder Ahoy - http://www.imdb.com/title/tt0058382/?ref_=fn_al_tt_1

Soylent Green - http://www.imdb.com/title/tt0070723/?ref_=fn_al_tt_1

Logan's Run - http://www.imdb.com/title/tt0074812/?ref_=fn_al_tt_1

Fanny och Alexander - http://www.imdb.com/title/tt0083922/?ref_=fn_al_tt_1

The Flight of the Phoenix - http://www.imdb.com/title/tt0059183/?ref_=fn_al_tt_2

Lawrence of Arabia - http://www.imdb.com/title/tt0056172/?ref_=fn_al_tt_3

The Bridge on the River Kwai - http://www.imdb.com/title/tt0050212/?ref_=fn_al_tt_1

Operation Petticoat - http://www.imdb.com/title/tt0053143/?ref_=fn_al_tt_1

Just started to watch #1.

btw - if you love music, you may love this movie (as i do):

Edited by GermanGuy - 12/20/13 at 12:00pm

Just received the parts from Shikada-San including a second internal power supply board!

Quote:
Originally Posted by GermanGuy

Just received the parts from Shikada-San including a second internal power supply board!

You are crazy...!  This is why we like you :-)

TU-05  v/s  TUR-06 ?   or  v/s GoVibe Porta Tube  or ... Fostex HP-V1

So... besides spkrs01 did someone else had a chance to compare the sound of the TUR-06 with his big brother ?

I love my TU-O5, but since it is quite bulky for portable set-up, I wonder if a TUR-06  will do it on the move ?

or...  a GoVibe Porta Tube  or the "to come" Fostex HP-V1... If I want an even smaller  "tube" Amp ?

Edited by bmichels - 12/21/13 at 9:28am
Quote:
Originally Posted by bmichels

TU-05  v/s  TUR-06 ?   or  v/s GoVibe Porta Tube  ?

So... besides spkrs01 did someone else had a chance to compare the sound of the TUR-06 with his big brother ?

I love my TU-O5, but since it is quite bulky for portable set-up, I wonder if a TUR-06  will do it on the move ?

or...  a GoVibe Porta Tube If I want an even smaller  "tube" Amp ?

Thanks AnakChan, but I read those already several time.  I wonder if other people has chance to hear booth.

And besides those 2 very good review, can you tell which sound do you personally prefer ?  05 or 06 ?

I have heard the porta tube, it is a good amp, it has smooth, warm and more laid back vocal presentation. But personally I prefer the tur06 for the in your face vocal presentation and imo it has better sounding overall by quite a large margin. the portatube did not give me the wow factor even it is a better amp than my xduoo xp-1. Not like the tur06 that really a mind blowing experience for me.

Quote:
Originally Posted by xplosive

I have heard the porta tube, it is a good amp, it has smooth, warm and more laid back vocal presentation. But personally I prefer the tur06 for the in your face vocal presentation and imo it has better sounding overall by quite a large margin. the portatube did not give me the wow factor even it is a better amp than my xduoo xp-1. Not like the tur06 that really a mind blowing experience for me.

I thought that the TUR-06 was better than the Porta Tube.  It make sense...   And now we also need to wait for the release of the Fostex HP-V1 that might be a good surprise (expecialy when paired with my  Fostex TH-900 )

Quote:
Originally Posted by bmichels

TU-05  v/s  TUR-06 ?   or  v/s GoVibe Porta Tube  or ... Fostex HP-V1

So... besides spkrs01 did someone else had a chance to compare the sound of the TUR-06 with his big brother ?

I love my TU-O5, but since it is quite bulky for portable set-up, I wonder if a TUR-06  will do it on the move ?

or...  a GoVibe Porta Tube  or the "to come" Fostex HP-V1... If I want an even smaller  "tube" Amp ?

there was a german comment about the sound of tube amps in relation to the anode voltages, with the author's statement that he never heard a low voltage tube amp sounding as good as a higher voltage tube amp. don't know if this is true, but could at least think that the tu-06 will always perform better becuase of the step up converter board integrated and so the tubes running with high voltage.

btw, one result of my work will surely be a miniaturized standard tu-05.

at the moment i am working mainly to achieve the following goals:

- optimization of the whole power path, shielding, cableling

- standardization of improved cable connectors and connections for and between the pcbs but also input and output lines and signals

- manufactoring and manufactoring time optimization by providing connectable standard moduls for power supply and tube sections and pcbs that can be much easier soldered and connected

within the increasing email exchange with shikada-san (somewhat limited by the fact that he is hyper busy building amps) i offered him to send him all my results, pcb designs and other things i find out (components and sources for, ideas ... whatever), and i was very happy that he agreed to do so really appreciating my work, so if there is any result good enough and worth it after beeing checked and verified by shikada-san, you may have the chance to see new or improved products and/or  improved manufactoring time for new products.

on the product's side at the moment:

- building an amp for me

- designing a modular tube section with pcb

- battery driven (small, not the big one) one channel power supply boards wasting some energy but with voltage regulators for each tube and each voltage where the voltage is measured directly on the tube(s), so very stable, precise, additional noise, hum, ripple suppresion of up to 70dB if i can believe in the datasheet of the voltage regulators

Edited by GermanGuy - 12/21/13 at 11:56am

the modder 's diary part 14 4/5:

today i finalized the recableling of my existing tu-05 :

i recabled the whole power path with much thicker cable.

here you see the new power line cable in comparison to the old ones:

this is the recabled power supply from battery to internal power supply board:

to get the much thicker cables connected to the internal power supply board i had ordered larger connectors.

here you see the new power cable in comparison to the old one:

just working i also provided a shielded brass tube (the tube on top) for the bias battery wires.

here you see the modified tu-05 (one side):

and here the other side (looks horrible, good luck everything worked, no idea how to change a part here):

the whole chain:

Edited by GermanGuy - 1/1/14 at 3:53am
Quote:
Originally Posted by bmichels

Thanks AnakChan
, but I read those already several time.  I wonder if other people has chance to hear booth.

And besides those 2 very good review, can you tell which sound do you personally prefer ?  05 or 06 ?
Well you said "anyone else besides spkrs01" so I hope you didn't mistake me for spkrs01 ;-)!!

After reviewing both I bought the TUR-06 but that was because size mattered to me. I think the 05 is probably more neutral and overall leans more towards an audiophile's sound whereas the 06 leans towards a more fun sound mainly due to a slight bass emphasis. I chose fun in the end for myself.
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