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Old 5th December 2012, 09:25 PM   #8781
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Buzz for hammond use 229series or at last split coil design ,the best are r-core avoid toroid
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Old 5th December 2012, 10:18 PM   #8782
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I was looking at 229. R core are hard to find of good quality and expensive when you do. Toroid will be kept in seperate box if noise is your concern.
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Old 6th December 2012, 12:11 AM   #8783
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Hi folks-

Thank you Salas for the latest build schematic.

Now I have to make a decision to either mod my existing Salas RIAA's or build a new pair....! I still have some matched jfets and leds. Looks like I'll lave to order a new set of texas precision R's for the network anyway. Where's a good source for 2SK369's?

-Kent
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Old 6th December 2012, 02:10 AM   #8784
Salas is offline Salas  Greece
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On Ebay on ammo tape, Singapore or something. Few samples were good. But you never know what's next. You guys should ask someone like Spencer of FET audio if he can secure some verified ones maybe.
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Old 6th December 2012, 02:28 AM   #8785
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Thanks. Any recommendation on IDSS mA? Jaap's got some V's for sale.
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Old 6th December 2012, 02:39 AM   #8786
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Hi Buzz

I have bought R-Cores from an eBay seller in Hong-Kong called 'Hi-Fi Spot'.
Search 'R-Core transformer'...from international sellers.
They have 100% feedback, & their R-Cores are first-rate, and not expensive even with shipping IMO.
Just make sure you get one with enough 'voltage overhead', if you know what I mean.

Thing about R-Cores is...
...they offer a FREE inbuilt RFI-filter, as the RFI can't 'jump across' between the primary & secondary, by capacitive-coupling.
Toroidals are TERRIBLE in this respect.
EI's a bit better.
R-Cores...BEST !!!

It's worth it.
They have loads of different VA's & voltages as well.

Cheers.

Si.
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Old 6th December 2012, 02:47 AM   #8787
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Hi Ricardo

Thanks for the Haku ( typo ? ) prose, on silver-mica & styrene.
" Powerfull snappy sound "
" Smoother highs "
Nice !
Well, we want BOTH ! at Space Egg...
...so experimentaly it is...14nF silver-mica, with 'parallel plastic' to bump-up to NIRVANA !

BOO JAH ! to that.

More news on the DIY source-resistors soon, + PICS !...
...they working well & lookin'...
... " A OK Houston... over ".

Cheers.

Si.
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Old 6th December 2012, 08:16 AM   #8788
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Hummm cinese R-core! "voltage overhead" means poor regulation ie bad design .

Selectronic r-core is certificate njfet riaa

Buzz ,the toroid are good about radiate noise the problem is that are wideband device very bad con filter the main gremlins..the 229 are on my phono btw, EI with split design in separate box are best too

Separate box always if possible, psu diode /caps radiate noise too
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Last edited by nicoch58; 6th December 2012 at 08:21 AM.
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Old 6th December 2012, 10:18 AM   #8789
Salas is offline Salas  Greece
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Quote:
Originally Posted by kstlfido View Post
Thanks. Any recommendation on IDSS mA? Jaap's got some V's for sale.
This one isn't flexible at all for IDSS. You need 11mA K369BL as it is noted. Maybe 20 pcs needed to chance on a couple of good pairs about the 11 mark.
2nd tier quality solution is the 2x K170BL 8mA example I had posted. 2 junctions and more 1/F noise, but +2dB gain. Not bad at all in the end, still not the reference design exactly.
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Old 6th December 2012, 10:19 AM   #8790
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Quote:
Originally Posted by The Space Egg Corp View Post
........................Thing about R-Cores is...
...they offer a FREE inbuilt RFI-filter, as the RFI can't 'jump across' between the primary & secondary, by capacitive-coupling.
Toroidals are TERRIBLE in this respect.
EI's a bit better.
R-Cores...BEST !!!...............
Are you sure?
Rcores have half the primary turns on one limb and the other half on the other limb.
The secondary turns are similarly split between the two limbs.
This is an ideal way to capacitively couple the Primary to Secondary windings.

EIs that separate the Primary from the Secondary are better at reducing capacitive coupling. If I understand transformer correctly this reduction in capacitive coupling is at the cost of increased leakage inductance. You swap one for the other.
There is no "best". All are a compromise.
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