[GermanGuy]

regarding the tube rings - maybe i will make shorter ones, more similar to real rings, just for comparison and to learn something. as summary the tube rings correct one weakness at the cost of another weakness, so not that attractive, at least for this amp and the tube types used for it.
 
i by a far margin prefer tube rolling and finding the best tube combo for a specific sound, i have the feeling that tube rings here alwyas will be only a compromise.
 
my dream combo sounds better without tube rings (but i have to find another way to get this great bass quality enhancement, in this area the tube rings are doing a great job).

 

[ianmedium]

Honestly, as crazy as it sounds try to find a small slab of marble Approximately 11cm x 3cm x 5cm (L.W.D) and place it halfway across the amp top. I have no idea why this works but it does! Add's a little bass but also increases the openness!

Mine is scruffy looking as it is an off cut from a kitchen counter top but it does the job!

 

[GermanGuy]

interesting comparison of tube rings here:
 
http://herbiesaudiolab.net/compare.htm

 

[GermanGuy]

marble and aluminium (as other strong materials like granite or stone) have resonances and vibration modes in the 1 to about 10 KHz range, so the marble maybe absorbs some of the resonances of the aluminium, also the cradle - amp - marble construction works as damper for movement caused by external movement or vibrations.

 

[ianmedium]

See, that is why your such a valuable member here GG, that now makes sense!

 

[GermanGuy]

here are some nice pictures i found illustrating this. they show the amplitude of the resonances of the housing of a grundig amplifier:
 
resonance amplitudes of the housing placed on
 
bad / weak underground without base:
 

 
good / strong underground without base:
 

 
bad / weak underground, with base (hopefully like my cradle i will make):
 

 
good / strong underground, with base:
 

 
maybe this also illustrates why i will wait and make a base / cradle with the construction details as posted some time ago.

 

[smial1966]

ianmedium,
 
Is that marble or a rather large piece of Kendal Mint Cake?!? 
 
Cheers,
Andy
 
Quote:

Honestly, as crazy as it sounds try to find a small slab of marble Approximately 11cm x 3cm x 5cm (L.W.D) and place it halfway across the amp top. I have no idea why this works but it does! Add's a little bass but also increases the openness!

Mine is scruffy looking as it is an off cut from a kitchen counter top but it does the job!

 

[GermanGuy]

maybe a piece of Alaska pollock waiting for lunch time?

 

[ianmedium]

Kendall mint cake, sheesh Andy, your bringing back memories, never could stand that suff!

GG, those graphs make sense, so I will continue to use the mint cake on my amp!

I am now going to turn my attention the base where I put my 801. I have a lump of cork covered wood which it rests on when I use my amp with it. I think I am going to try the wood cones underneath it and see what happens!

Oh Andy, I never heard back from multiple emails sent about that cable so I have given up on them!

 

[woodcans]

This thread is fantastic.

 

[Boringer]

+1
Kudos to you guys... 

 

[Boringer]

Quote:

Nice find on the video. They actually caught me whizzing by right to left 19-22 sec into the video with my camera around my neck .

 
Ahaa.. That's the way you created a great coverage on the event. Congratz... 

 

[smial1966]

ianmedium,
 
Kendal mint cake is definitely an acquired taste, a bit like Marmite! 
 
No worries about the cable as the Epiphany one is very flexible and probably `sounds' as good. Do try to mail that Dire Straits SD card if you get a minute, as it'd be nice to revive a few musical memories.
 
Cheers,
Andy.
 
Quote:

Kendall mint cake, sheesh Andy, your bringing back memories, never could stand that suff!

GG, those graphs make sense, so I will continue to use the mint cake on my amp!

I am now going to turn my attention the base where I put my 801. I have a lump of cork covered wood which it rests on when I use my amp with it. I think I am going to try the wood cones underneath it and see what happens!

Oh Andy, I never heard back from multiple emails sent about that cable so I have given up on them!

 

[bmichels]

new 10" copper cable coming... Made for me by Casque-headphone
 

 

[ianmedium]

So gold is now officially an option!

This just posted on ASP's FB page!