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Old 4th December 2012, 08:16 PM   #8771
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Hi Salas & Ricardo.

The 'styrene & tin-foil' talked about...
...is this the material used in the Ruskie 'big-block' type 'Square' Polystyrenes...
...or are we talking about something different ?

I have both 100n & 47n of the Ruskie K72's here already, to try.
Pinched ?
Ouch !!!...that sounds painfull !

Component size...No-worries...Here at Space Egg !

I guess that means I'll have to get FT3 now, as well ?
To try ?
Nightmares otherwise ?

Darn capacitatoes !!!

Cheers.

Si.
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Old 4th December 2012, 08:40 PM   #8772
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Hi Space

Styrene ad tin foil is somethin like Relcap polystyrene & tin foil.... heavy caps (tin foil) with polystyrene dielectric..... Some say these are the best of many worlds... I do, JC also... It seems Salas like them also.....

K72 are teflon dielectric URSS caps... quite good but not on par with Ft-3... read last salas post.

Caps do not frighten me ... love them... the bigger the better.... (I mean higher voltage ones)... and square ones seem to sound better than tall ones....

Have been there, done that... do not feel the pain.

Anyway, like Socrates I say (Só sei que nada sei) I only know that I know nothing
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Old 5th December 2012, 12:12 AM   #8773
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Darn !

I thought from reading the thread; that K72's 'Were where it's AT baby !'
Seems not.

Oh well...a few quid more on the ever spiraling ( Ayrton Perry styleee ) budget !
Only 'the best' for the Simplistic though.
I hope to take this new phono-pre...To my grave !...
...so might as well 'flash the cash' on some more old-school Ruskie tech !

----------

Another 'ultimate' question...
I get the concept of having 'single' coupling-caps ( although, have seen 33n + 33n + 33n etc. )...
...'for coherance'.

But obviously even 'top-gurus' add 'parallels' to their 15nF filter-caps.

The signal here though is obviously getting 'dumped to ground'...
...seems that top-stability & accurate-value is the goal here.

The reason I ask is...
...I have some 14nF silver-micas, as a possible here.
I could try 'bumping them up' with an extra 1.5nF silver-mica...
...but would probably still need a few extra 'small' silver-mica's to hit the correct value.

To cut to the chase...
...Any objections, to say 1/2 a dozen silver-mica's in parallel ?
( I have seen a couple of 'top gurus' do it ! )

-------------

I also have some K72 Teflon 15nF 1600volt caps.
They measure...
15.48
15.49
15.50
15.58
This is at the 'centre of their drift'.
They do 'drift' a bit ( a lot actualy ), but no more than Polystyrenes, I have tested.
Silver-mica seems very stable, by comparison.
Anyone tried the K72's in the RIAA filter ?
47nF K72 also ( I have some bang 'on spec' ones )...
...Silver-micas I have also, 'bang on' at 47nF.

Can try them all of course; just wondering if peoples have been the same way.

The 'Simplistic' is turning out to be 'The Complestic' ! as for parts gathering.

Desk full of parts though...
...soldering-iron at the ready...
...We build SOON !

Cheers

Si.
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Old 5th December 2012, 09:45 AM   #8774
RCruz is offline RCruz  Switzerland
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Riaa caps are not coupling caps. They form a complex filter to aproximate the 6db slope cut into records.

You can use parallel caps here to reach optimum values.

For the HF caps I suggest you start at 15n and then add small quantities until you reach nirvana.

micas give powerfull snappy sound, styrenes give smoother highs.... cook it up to your taste
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Old 5th December 2012, 11:06 AM   #8775
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Given the opportunity, what makes dual power transformers superior over a single larger trafo with dual sceondaries?

Also, if housed in a seperate enclosure, EI like Hammond or toroidal?
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Old 5th December 2012, 11:22 AM   #8776
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IMO, if you use a single TX with dual secondaries, it is marginally the same as using two separated tx.

IMO also, dual mono is much better in this situation and TX power (VA) is important also.
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Old 5th December 2012, 12:40 PM   #8777
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I am using dual SSLV1.1 and just trying to determine 2 50VA Hammonds vs single 200VA toroid, with dual secondaries and shielding.
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Old 5th December 2012, 01:15 PM   #8778
Rush is offline Rush  United States
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Quote:
Originally Posted by buzzforb View Post
I am using dual SSLV1.1 and just trying to determine 2 50VA Hammonds vs single 200VA toroid, with dual secondaries and shielding.
I would go with the 200 VA.
You probably knew that.

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Old 5th December 2012, 01:19 PM   #8779
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Quote:
Originally Posted by Rush View Post
I would go with the 200 VA.
You probably knew that.

Rush
Indeed,

I recently compared two 50VA TX with a single 160VA toroid and the difference in soundstage and esae of presentation is BIG. VA matters a lot.
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Old 5th December 2012, 02:22 PM   #8780
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Thank you. THat is the direction i was leaning, just wanted to make sure.
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