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#26 pre amp
#26 pre amp
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Old 3rd April 2013, 07:05 PM   #3131
merlin el mago is offline merlin el mago
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These white are 4 x 24AWG all teflon copper silver plated, screen is also copper silver plated, inside and outside dielectric is always PTFE
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Old 3rd April 2013, 09:16 PM   #3132
DIYspaceW is offline DIYspaceW  Slovenia
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Quote:
Originally Posted by Vinylsavor View Post
Hi!

Congrats for the beautiful build Felipe!



I agree! While you are at it you might want to try a pure choke input filter. I am using LCLCLC for preamps with the last LC separate for each channel

Best regards

Thomas
Will try...but a small input capacitor makes the magic also...)
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Old 3rd April 2013, 09:31 PM   #3133
rclourenco is offline rclourenco  Portugal
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Originally Posted by merlin el mago View Post
These white are 4 x 24AWG all teflon copper silver plated, screen is also copper silver plated, inside and outside dielectric is always PTFE
Looks nice, do you strand the 4 wires?
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Old 4th April 2013, 08:56 AM   #3134
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by rclourenco View Post
Looks nice, do you strand the 4 wires?
It is the same cable that Erno Borbely uses in his house.
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File Type: jpg DSC00308.jpg (467.4 KB, 517 views)
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Old 4th April 2013, 04:40 PM   #3135
merlin el mago is offline merlin el mago
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Default 100K Noble pot

Hey guys,
I want to improve my 100K Noble pot, how can do it: see pics?
TIA
Felipe
Attached Images
File Type: gif VolumePotParallelwiringdiagram.gif (5.3 KB, 468 views)
File Type: gif VolumePotParallelwiringdiagram mod.gif (15.9 KB, 457 views)
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Old 4th April 2013, 05:06 PM   #3136
bambadoo is offline bambadoo  Norway
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Is it the shunt mod you are thinking of?
Shunt Pot Volume Control for Better Sound and/or Gain Reduction - World-Designs-Forum
Click the image to open in full size.

Click the image to open in full size.
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Old 4th April 2013, 05:36 PM   #3137
rclourenco is offline rclourenco  Portugal
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Quote:
Originally Posted by merlin el mago View Post
It is the same cable that Erno Borbely uses in his house.
Thanks Filipe.
En hora buena por tu implementación del preamp.
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Old 4th April 2013, 05:43 PM   #3138
merlin el mago is offline merlin el mago
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Originally Posted by rclourenco View Post
Thanks Filipe.
En hora buena por tu implementación del preamp.
Muchas gracias Thank you very much.
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Old 4th April 2013, 05:49 PM   #3139
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by bambadoo View Post
Now I'm trying like attached pic, not exactly shunt but sounds very good, I use two 18k Shinkoh resistor and the improvement is big.

What do you think about the resistor value for shunt type also 18-20K?

TIA
Felipe
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File Type: gif VolumePotParallelwiringdiagram mod 20K.gif (12.3 KB, 99 views)
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Old 6th April 2013, 07:27 AM   #3140
amandarae is offline amandarae  United States
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Originally Posted by amandarae View Post
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My 26 Preamp. Thanks for this thread and the helpful guys keeping this thread as educational as can be.

Abe
Hello guys,

Just want to add info about the umbilical cord. It is about 5 feet using 300V/16Ga twisted and encased with braided shield for the B+ and 0V, 200V/18Ga twisted and individually shielded (per pair) for the two filament raw DC wires. 16 Ga Copper shielded for IEC and 18Ga shielded for chassis connections. All wires were then enclosed in black nylon jacket with all shields tied together.

Connectors are Neutrik NLT8MP (chassis) and NL8MPR(cord ends) with pins +/- 1 for heater 1, +/- 2 for Chassis GND and IEC GND, +/- 3 for B+ and 0V, and finally +/- 4 for Heater 2.

Enjoying the preamp as I type.


Abe
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