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Old 1st February 2003, 01:43 PM   #51
jam is offline jam  United States
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Jonathan,

Ever consider building a power amplifier?

From the photograph on youf web site you seem to be a fan of the Goldman amplifiers, any particular reason? By the way the latest issue of Hi Fi+ should be arriving in the States next week.

Jam
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Old 1st February 2003, 01:50 PM   #52
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Frank,

If you have not realized it, yet the master plan is to convert you into a solid state fan!

Jam
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Old 1st February 2003, 02:03 PM   #53
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Default LOL.

Hi,

Quote:
If you have not realized it, yet the master plan is to convert you into a solid state fan!
That will never work.

I must say that I have the deepest respect for Jonathans' work though.
If he can pull it off,then why not?

Now,if I can find tubed gear manufacturers that paid as much attention to detail as Jonathan does....

Like Jonathan (I presume) I think it's much harder to build the ultimate (phono) preamp than to come up with a worldbeating amplifier.
Just my assumption though.

Cheers,
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Old 1st February 2003, 02:40 PM   #54
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Default Re: LE CHEF.

[QUOTE]Originally posted by fdegrove
[B]Hi,




****Sounds like you had something in need of a smooth over to me.
The RTX range may be a tad too revealing for a SS device,just my opinion anyway.****

Hi Frank,

I agree with you here, and this fits in with Peter's comments about RTXs being sibilant.

Personally, I believe RTXs to be ruthlessly accurate, but a lot of SS gear is not well suited to this level of 'revealing'.

When I first started to use RTXs, I simply 'automatically' copied my earlier arrangement (Ultracaps with bypasses) and changed to using the same size RTXs with .01 RTX bypasses in place of the earlier caps.

This was almost throughout my system. i.e. preamp, amp, and speakers.

I immediately heard better detail, but the highs were becoming accentuated, like Peter suggests, and sibilant sounds (especially on female vocals) were 'over the top' for my liking.

By this time, all of my signal path resistors were either Vishay BFs or Caddocks which are similarly 'ruthless' (i.e. they don't hide anything!), and I wondered for a while whether the RTXs were, perhaps, not quite so good as I had at first thought.

Anyway, I lived with this setup for most part of a year, during which time I had started to remove some of the smaller bypasses in my speakers, as this seemed to improve this sibilant problem, and, unexpectedly, the extra detail I had gained when originally installing the RTXs remained.

One weekend, when I was recovering from a migraine headache (and I was still feeling rather fragile!) I was listening, quietly, to some music, and the remaining sibilant problems were just too much for me to bear.

So, on impulse, I went through the entire system and removed every remaning low value bypass from the RTXs, and the result was astonishing.

The entire spectrum of sound now seemed fine, there was none of the anticipated loss at HF, and the sound was nicer overall than I had ever experienced in my syatem.

Previously, when considering these bypasses, I formed the opinion that leaving them in circuit could not possibly be harmful to the sound, as whenever I had used bypasses before I went RTX, the bypasses had substantially improved the upper clarity etc.

This almost accidental discovery made it clear to me that RTXs don't need any smaller values to sound at their best, which, with hindsight as they are effectively internally bypassed 10x anyway, does make some sense.

Some time later, I read that Finch & Marsh (Richard Marsh was the caps' designer, of course) do not recommend bypassing their RTXs anyway.

Peter will no doubt put me right about this, but I have a feeling that he is not so averse to using electrolytics in the feedback or signal path areas in his amps, and if this is so, I would stake my life on the fact that this will be lot to do with the sibilant problems he notices when using the more revealing TRXs.

Many years ago, I redesigned my amps to only use plasic films of the quality of RTXs everywhere around the main circuitry, especially in DC feedback blocking etc. and the amps are fully DC coupled everywhere, simply because I couldn't get on with the sound of the lousy electrolytics.

However, when I first got hold of some BGs (about ten years ago) they were merely 'standard' types intended to be used in my turntable PS (for the 90 degree phase shift for the AC motor).

Before I installed these BGs in my T/T PS, I tried them out in my amps in the feedback DC location (temporarily replacing RTXs), just out of curiosity to see how they would sound in such a critical area.

Well after a week or so of burn in, the sound wasn't too bad, but not a patch on how it was earlier, but back came that wretched agressive sibilant sound again.

I know that those BGs were not fully burned in, but with any of my later BG installations anywhere in my system, after a few days in use I have never suffered from this sibilant problem, although there are many other 'shortcomings' during the full burn-in time of these BGs.

So, make of it what you will, but it reinforces my long-held views that electrolytics should be kept well away from *all* signal path circuitry, no matter where and/or how good the caps are, if the best sound is sought after.

It is only because of this aversion to using electrolytics in such locations, that I have been deterred from constructing any of Nelsons designs, as so many of them which are attractive to me do use high value caps in awkward locations which cannot be readily 'designed out'.

Regards,
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Old 1st February 2003, 03:34 PM   #55
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Default Re: Re: LE CHEF.

[QUOTE]Originally posted by Bobken
Quote:
Peter will no doubt put me right about this
I'm still experimenting with the caps and although the end of the road is nowhere in sight, the best way is to try everything myself.

Bob,

I wonder what are your findings regarding Cerafines. I thought they were next best thing after BG, but recently found some posts, with people having different views regarding those Elna caps. I bought last batch of them from Parts Connections and was hoping to use them in my best amp project.

As to the price of BG, they are not that awfully expensive, it's just dealers markup makes it seem like. We recently purchase 100 of them directly from Japan and the price was about 1/3 of what the local dealer is asking for.
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Old 1st February 2003, 03:35 PM   #56
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Default BYPASS.

Hi Bob,

Quote:
Some time later, I read that Finch & Marsh (Richard Marsh was the caps' designer, of course) do not recommend bypassing their RTXs anyway.
Lucky for me I hardly ever bypass any cap, I rather use a better one or put smaller equal values in // to obtain the value I require.
Smaller values seem to have faster transient response behaviour IME.

After having read tips in magazines about bypassing caps and so on,I tried it and found it completely unbalanced the system noticing the same lack of coherency as you have described before.
Quite similar to using multistrand wire iso solid core I'd say.

Before I invested in the MIT caps I had read the Finch & Marsh articles in SP (I think) so I was warned and I never even tried it out since to my ears they were simply so revealing and transparant that I never felt any need to bypass them.

You may be right about them being too transparent for use in SS device though.

Maybe we should start recommending golld PIO coupling caps to them?
That should gobble up any sibilants and slow down transient response in the process?

Very fine polyprops for use in PSUs are the ANSAR Supersound,much cleaner sound than the Solen c(r)ap IME.
And they're made in Britain to boot.

Has anyone ever tried the beeswax caps Jupiter is making?
I hear Brian Cherry is planning on carrying them and they should also become available with coper plates ISo the alu ones they use now.

Cheer,
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Old 1st February 2003, 03:45 PM   #57
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Default bypassing

Another important issue regarding paralleling/bypassing caps is observing directionality/polarity. The better caps have outer foil marked and this is usually the end that supposed to be directed towards load.

When using 0.1 Jensens copper foil as input coupling caps in my Aleph X amp I simply had to bypass them with 0.022 silver foil caps for proper sonics. However paralleling 2 caps, there are 4 options as to the way to connect them. I tried all the optios and definitely only one sounded the best, incidentally it was the way where both paralleled caps had the outer foil directed towards the load.
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Old 1st February 2003, 03:55 PM   #58
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Default SHIELDS UP.

Hi,

As far as the MITs go,the lettering on the caps has to follow the signal flow.
I.e. in at M and out at the T of MIT.
Most boutique caps I know of seem to respect this when they put their sticker on the caps.

Some caps that you can buy unbranded can give a hard time guessing but usually when you go around the ends of the cap with you indexfinger you can actually feel the foil connection.

Cheers,
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Old 1st February 2003, 03:59 PM   #59
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Default Re: SHIELDS UP.

Quote:
Originally posted by fdegrove
Hi,

As far as the MITs go,the lettering on the caps has to follow the signal flow.
I.e. in at M and out at the T of MIT.
Unfortunately this is not the case. In the past all my MIT purchases came from Michel Percy and he measures the caps for outer foil and puts the black dot on the outer foil end. I noticed that it didn't match the lettering flow, it was usually 50/50 affair. Sorry for confusion it may bring.
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Old 1st February 2003, 04:04 PM   #60
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Default I KNOW WHAT TO DO THE WEEKEND.

Hi Peter,

Quote:
it was usually 50/50 affair.
Really?
This shouldn't be according to their white papers.

I'll have to heat up the iron.

Any idea how to measure this?

Cheers,
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