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post #1381 of 3704

i had an additional idea how to dampen the tubes possible because the housing of the tu-05 is just as it is.

 

i used this relatively strong sponge rubber made to fill the joints between window frames and walls when building a house:

 

 

i cutted four pieces out of it always slightly longer than the distance between the top of a tube and the housing above.

 

i used a kitchen knife and a wooden tool to cut everything parallel / right angle:

 

 

i then shaped conical holes into the pieces using the shaping tool shown bottom right:

 

 

the holes are needed for a better fit of the sponge rubber parts on top of the tubes:

 

 

here you can see the sponge rubber pieces put on top of the tubes between tubes and housing as damper (and also the foam rubber disks as damper between sockets and tubes).

 

how does it influence the sound - more about that after my siesta!


Edited by GermanGuy - 7/31/13 at 6:46am
post #1382 of 3704
Quote:
Originally Posted by smial1966 View Post

For the less skillful artisans and technically inept among us (I include myself in the latter category) curious about vibration control and resonance affecting the sound quality of our amps, here's a relatively low cost isolation `platform' that has been receiving decent reviews in the German audio press. 



There's more information here - http://www.soundfidelity.co.uk/products/ssc/minibase-200/


I've ordered the natural wood one and will report back regarding it's effectiveness.

Cheers,
Andy. 

I am very interested to hear what you think of this Andy.
post #1383 of 3704
Quote:
Originally Posted by ianmedium View Post

I am very interested to hear what you think of this Andy.

Me too. Very interested.
post #1384 of 3704
Quote:
Originally Posted by bmichels View Post

Quote:
Originally Posted by ianmedium View Post

I am very interested to hear what you think of this Andy.

Me too. Very interested.

 

Yeahhh... Count me in...! Very very interested... 

post #1385 of 3704
Just heard that I have some Nordost Odin terminated to mini to mini on its way to me. This is pure silver so I a, looking forward to hearing what this sounds like!
Edited by ianmedium - 7/31/13 at 11:46am
post #1386 of 3704

tube dampers - influence to the sound:

 

i spent two hours listening to the

 

- tu-05 with the lorenz df96 - tung-sol ken rad dl92 combo

- trying ALL the different possible combinations of

-    sponge rubber dampers (srd's) between tube and housing and the

-    foam rubber disk dampers (frdd's) between tube and socket

 

using only frdd's between socket and tube in all combinations the results are very similar to the results of my tube rings:

 

- bass quality improvement at the cost of a softer, less airy and less engaging sound (but at least less loss than with the tube rings).

 

- also combinations of srd's between tube and housing and frdd's between socket and tube have this weakness.

 

to better understand what happens i tested the results only dampening the lorenz df96 and then only dampening the tun-sol ken rad dl92 with very interesting results at least with my tube combo:

 

dl92 dampening:

 

- dampening the dl92 with whatever is the primary reason for loss of air, soundstage, speed, engaging sound, while the bass quality improvement is clearly to hear.

 

- overall dampening of the dl92 is not recommended with the exception of using a frdd between tube and socket to improve bass while softening the whole sound for example for an analytical to harsh sounding tube combo.

 

df96 (df91) dampening:

 

dampening the df96 with

 

- a frdd between tube and socket or 

- a frdd between tube and socket and a srd between tube and housing

 

also results in better bass but loss of how to say magic sound, air, natural presentation.

 

BUT i was really surprised when dampening the df96 only with a sponge rubber damper (srd) between tube and housing.

 

- it improves both precision / detail AND bass quality, depth and texture

- the df96 / df91 has much more influence here than i thought before

 

at first i thought it would result in slightly less soundstage width and depth but then PLOP - the amp switched off due to weak battery.

 

after connecting the amp to the charger - PLOP again - soundstage depth was back!

 

so with all pros and cons:

 

dampening the df96's (df91's) with my sponge rubber dampers between tube and housing is a real improvement in bass quality without the loss of other important sound properties and 

 

higly recommended to try!

 

 


Edited by GermanGuy - 7/31/13 at 12:55pm
post #1387 of 3704
I will give that a go GG, thank you for your experiments!
post #1388 of 3704

here are some pictures of my cradle after two times painted with clear laquer, wax applied and machine polished:

 

 

 

 

it now has this dark 'one hundred years used old western style wood' look i love.

 

p.s. and hopefully increasing the avarage group cradle rating from 'looking good' to 'looking good to very good' smile.gif


Edited by GermanGuy - 7/31/13 at 12:57pm
post #1389 of 3704
In my albeit limited experience, any form of direct tube damping has been ultimately deleterious to the overall sound. Besides which, as glass is inert and naturally non-microphonic anyway, the only microphony evident will be in a tube with a minute crack or fissure.

Cheers,
Andy.
Quote:
Originally Posted by GermanGuy View Post

tube dampers - influence to the sound:

i spent two hours listening to the

- tu-05 with the lorenz df96 - tung-sol ken rad dl92 combo
- trying ALL the different possible combinations of
-    sponge rubber dampers (srd's) between tube and housing and the
-    foam rubber disk dampers (frdd's) between tube and socket

using only frdd's between socket and tube in all combinations the results are very similar to the results of my tube rings:

- bass quality improvement at the cost of a softer, less airy and less engaging sound (but at least less loss than with the tube rings).

- also combinations of srd's between tube and housing and frdd's between socket and tube have this weakness.

to better understand what happens i tested the results only dampening the lorenz df96 and then only dampening the tun-sol ken rad dl92 with very interesting results at least with my tube combo:

dl92 dampening:

- dampening the dl92 with whatever is the primary reason for loss of air, soundstage, speed, engaging sound, while the bass quality improvement is clearly to hear.

- overall dampening of the dl92 is not recommended with the exception of using a frdd between tube and socket to improve bass while softening the whole sound for example for an analytical to harsh sounding tube combo.

df96 (df91) dampening:

dampening the df96 with

- a frdd between tube and socket or 
- a frdd between tube and socket and a srd between tube and housing

also results in better bass but loss of how to say magic sound, air, natural presentation.

BUT i was really surprised when dampening the df96 only with a sponge rubber damper (srd) between tube and housing.

- it improves both precision / detail AND bass quality, depth and texture
- the df96 / df91 has much more influence here than i thought before

at first i thought it would result in slightly less soundstage width and depth but then PLOP - the amp switched off due to weak battery.

after connecting the amp to the charger - PLOP again - soundstage depth was back!

so with all pros and cons:

dampening the df96's (df91's) with my sponge rubber dampers between tube and housing is a real improvement in bass quality without the loss of other important sound properties and 

higly recommended to try!



post #1390 of 3704

Today I got ... 2  "Lorentz DF96"  bigsmile_face.gif  but... they are of 2 different type   !! mad.gif     ??? blink.gif ???

 

The vendor said that indeed, one is with a Round Getter and one with a square Getter.  Strange ! 

 

Hopfully, I have 1 additional Lorentz DF 96 that should come this week in the mail from another source. I hope that it will be similar to one of those 2 in order to make a proper pair !

 

 

 

 

My "yellow one" with the Round Getter (visible on the top) :

 

 

 

My "white one" with the square Getter !!?? : 

 

 

And.... none of them looks look this one from GermanGuy :-(((( :

 

 

 

--> Any ideas about those important built difference for the same name "Lorentz DF96" ??

post #1391 of 3704
Quote:
Originally Posted by smial1966 View Post

In my albeit limited experience, any form of direct tube damping has been ultimately deleterious to the overall sound. Besides which, as glass is inert and naturally non-microphonic anyway, the only microphony evident will be in a tube with a minute crack or fissure.

Cheers,
Andy.


i don't understand how direct tube damping can be ultimately deleterious when on the other hand you say that glass would be inert and non microphonic, so direct damping should have no influence?!

post #1392 of 3704

 

your first tube is an early one when lorenz was a standalone company. 

 

your second one seems to be a schaub-lorenz one.

 

my tube is a lorenz tube after schaub-lorenz was bought by itt.

 

Quote:

--> Any ideas about those important built difference for the same name "Lorentz DF96" ??


Edited by GermanGuy - 7/31/13 at 1:43pm
post #1393 of 3704
Exactly, as the 'damping' adds unnecessary mass to the tube which impairs it's operational capability within defined parameters.

Andy.
Quote:
Originally Posted by GermanGuy View Post


i don't understand how direct tube damping can be ultimately deleterious when on the other hand you say that glass would be inert and non microphonic, so direct damping should have no influence?!
post #1394 of 3704
Quote:
Originally Posted by smial1966 View Post

Exactly, as the 'damping' adds unnecessary mass to the tube which impairs it's operational capability within defined parameters.

Andy.


the sponge rubber dampers seem to work differently by stabilizing the tubes within the housing and dissipating and damping vibrations.


Edited by GermanGuy - 7/31/13 at 2:00pm
post #1395 of 3704
Comment removed as it was inappropriate.
Quote:
Originally Posted by GermanGuy View Post


so finally the same result. the sponge rubber dampers seem to work differently by stabilizing the tubes within the housing and dissipating and damping vibrations.

Edited by smial1966 - 8/1/13 at 9:12am
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