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Old 10th July 2012, 11:30 AM   #1271
soongsc is offline soongsc  Taiwan
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The impedance curve does nearly to 4ohms
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Old 10th July 2012, 11:41 AM   #1272
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Quote:
Originally Posted by soongsc View Post
The impedance curve does nearly to 4ohms
Thanks, so Badri should use 22V secondaries.
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Old 10th July 2012, 11:22 PM   #1273
bcmbob is offline bcmbob  United States
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Quote:
Originally Posted by KSTR View Post

For the same reason the GND shall only be connected at one single point -- solder the four lugs of the RCA's together, the RCA barrels will provide the contact to the box.

Click the image to open in full size.

It's all about keeping sending and receiving loop areas as small as possible.
* * * * *

Thanks Mr K. That is very clear. I'll be building one soon.

* * * * *

Well, what some people won't do while waiting for RC boards

2" x 2" x 1/8" leftover angle from hardware store.

Pot01.jpgPot1.jpgPot2.jpgPot3.jpg

Pre-building.
Pot3a.jpg


THE SECRET SAUCE (maybe snake oil) used as both glue and conductive filler. A line painted on paper doesn't indicate continuity but does read 1k resistance

ThinkGeek :: "Wire Glue" Conductive Glue

Click the image to open in full size.


Needle nose pliers and thin tips are a blessing.

Pot4.jpgPot5.jpgPot6.jpg

Sides have lip cut on router table with carbide bit.

Click the image to open in full size.


Closed up with 6-32 rod and fancy nuts.
Pot7.jpgPot8.jpg

If I did it again I would use RCAs with hex on both sides. Note marks from pliers.

Well, You know what is said about idle minds.
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Old 10th July 2012, 11:23 PM   #1274
bcmbob is offline bcmbob  United States
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Works as expected - sounds great!

Might make one for the eBay SMD pot.
Attached Images
File Type: jpg Pot9.jpg (106.8 KB, 240 views)
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Last edited by bcmbob; 10th July 2012 at 11:43 PM.
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Old 11th July 2012, 12:25 AM   #1275
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Pretty neat Bob!
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Old 11th July 2012, 01:02 AM   #1276
bcmbob is offline bcmbob  United States
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Thanks, it was fun to figure out how to keep it as small as possible. Been listening for an hour or so and the results are very impressive. Will prove to be a useful tool.

Good one to KSTR.
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Old 11th July 2012, 10:28 AM   #1277
atupi is offline atupi  Romania
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Default Russioan options for C13 cap

Quote:
Originally Posted by ClaveFremen View Post
Another great cap for builders on a budget is the russian polystirene K71-4(film/foil).

Not as good as the Audyns but incredibly good for the price.

They're quite big though, they will not fit perfectly on board.

After reading this i'be bought K71-4 and i also bought some K40Y-9 caps. Tested both and for my ears K40Y-9 sounds much more musical. I would say polystirenes are much more analithical and a bit boring compared to PIO.
Just a feedback from my own experience.

Dario between Amtrans and the other NOS ROE/Vishay that you sold as a 4.5EU package what would you choose ?
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Old 11th July 2012, 10:55 AM   #1278
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Thanks Atupi,

I was interested in the Russian PIO caps, but hadn't gotten around to ordering any. I think I'll order them, just to try.

Jac
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Old 11th July 2012, 11:17 AM   #1279
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K75-10 are even better than K40U(not Y )-9, IMHO.
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Old 11th July 2012, 11:19 AM   #1280
atupi is offline atupi  Romania
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I've bought also some K75-10 but installed in my Simplistic Phono RIAA preamp. They are huge in size compared to the others above but my RIAA preamp sounds really good now.
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