Simplistic NJFET RIAA - Page 865 - diyAudio
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Old 25th November 2012, 03:26 PM   #8641
RCruz is offline RCruz  Switzerland
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Originally Posted by vgeorge View Post
Second try on ebay for the 369 was fine. Try to find some that are on tape. Less likely to be fakes. Out of 10 pieces I managed to find two pairs.
Very nice work though Riccardo!
Are those BL types ?

Can you pm me a link to the correct suppler ?

Thank you
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Old 27th November 2012, 08:21 PM   #8642
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Finally I reached my target. The enhanced simplistic is a true stepup from the "regular" design.

I am allready used to the inherent wide soundstage, fluid mids and highs and total integrity of the simplistic sound and now I got a powerfull detailed bass due certainly to the increased detail provided by the new input stage.

There are no drawbacks... nothing is lost, I only notice an overall improvement in the allready outstanding performance.

Care must be taken to build a good electromagnetic screen over the amp but that is all.

Reaching nearer Nirvana all the time
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Old 27th November 2012, 08:35 PM   #8643
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A fresh round apple in your fruits collection. Congrats.

After I will examine it thoroughly myself too, I will put a couple of final instructions about.
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Old 27th November 2012, 11:13 PM   #8644
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Anyway, I never detected differences in noise using 2SK170BL. In my builds I believe the differences in noise come principaly from the value and type of Rs used.

In this case, using two k170 in parallel with much lower Rs really made the difference....
Hi Ricardo

I think you have a realy valid point here IMO.
I have been in the last few weeks, collecting & matching, large quantitys of WIRE-WOUND resistors for a build.
It seems to me the only 'logical' way forward ( Captain ).

There seems to be endless 'rattling on' about noise-performance, of relative Op-Amps & trannys in this forum...
...But when have you ever seen anyone build with WIRE-WOUNDS ?...
...I never have.

You build valve-gear with WW's ( particularly the high-values ), BOOM !!!!
INSTANT better performance...
...I am thinking mostly, microphones & mic-pre's here.
Not so much power-amps; but why not as well...
...particularly again, the 'high-values' that are always needed in valve circuits.

People seem to want to use carbon all the time...
...OK better stability for HT stuff...
...why not just use 'wire' though.

Been looking at resistors a lot this week.
Found in my stock a bunch of 'brand new' carbons...
...ALL drifted UP by as much as 20%; never even been in a circuit.
I also found a large number that were 'open circuit' or of MegOhm type values.

I'm sure people have done this, of course...
...just 'disected' a bunch of WW, carbon & Hi-Stab. glass resistors to see how they are made...
...well...
...it makes any use of 'oxygen-free' & 'silver-wire' seem slightly redundant.
Just 'wire' in the WW's though.

I'd be interested to see what you think of your new 'SUPER-Simplistic' with a FULL compliment of wire-wound resistors ( including ALL power-supply ones as well ).

I know you can do it Ricardo !!!

Cheers.

Si.
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Old 27th November 2012, 11:28 PM   #8645
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Guys. what caps would you recommend. I am looking at Multicap RTX vs Auricap XO, although I would consider others.
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Old 28th November 2012, 04:00 AM   #8646
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Not much noise from me here
Got few things cooking and prety cold in the loft
But came spring I probably have enough savings for ....
Teflon® Film Capacitors | Oil Capacitors by V-Cap
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Old 28th November 2012, 08:16 AM   #8647
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Guys. what caps would you recommend. I am looking at Multicap RTX vs Auricap XO, although I would consider others.
For the output ?
I would certainly go for the tin foils.
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Old 28th November 2012, 08:20 AM   #8648
RCruz is offline RCruz  Switzerland
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I know you can do it Ricardo !!!
Hi Si

Off course it could be done if we could find suitable small and inexpensive WW.

Particularly for the Rs, one could use two WW wired in parallel in reversed directions to minimize any inductance.
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Old 28th November 2012, 10:05 AM   #8649
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For the output ?
I would certainly go for the tin foils.
RIAA caps

Leaaning towards RTX

I have Mundorf SIlver in Oil for output.
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Old 28th November 2012, 10:53 AM   #8650
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Quote:
Originally Posted by buzzforb View Post
Guys. what caps would you recommend. I am looking at Multicap RTX vs Auricap XO, although I would consider others.
Quote:
Originally Posted by buzzforb View Post
RIAA caps

Leaaning towards RTX

I have Mundorf SIlver in Oil for output.
For RIAA caps looks for precision 1% or better, VISHAY-RODERSTEIN MKP-1837 Metalized Polypropylene Film Capacitor is a good an economical choice.
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