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Crack;Bottlehead OTL - Page 302

post #4516 of 6333
Quote:
Originally Posted by olegausany View Post


A $10 power strip and then complaining? Get yourself a Furman one costing over $100 on Amazon and enjoy your music

it's actually 8 Outlet Surge Protector (don't remember the name) ..I just call it power strip ,sorry 

post #4517 of 6333
Quote:
Originally Posted by Doc B. View Post
 

Before you put too much time into that verify whether the hum goes up and down as you turn the volume control. If it changes then it is possible that hum is being picked up somewhere ahead of the volume pot like the input wiring, or your interconnects or your source component. If the hum stays the same regardless of the volume setting don't waste too much effort on that part of the amp as that means the hum is coming in after the volume pot, like maybe a tube that has a little heater-cathode leakage or there is some interference in the room like maybe a power transformer on another piece of gear that is close to the amp.

Hi! 

 

I checked the volume nob, the background noise is the same regardless of position. Also tried plugging in the amp to another wall-jack and the noise was still the same. I don't even know what heater-cathode leakage is, and is it possible to check wheter my tubes suffer from that without buying new ones? 

 

edit: Okay tested with two different of the small tube (is this the driver tube or whatever you call it?) and the background noise is slightly higher using one of them compared to the other but still present. Unfortunaly I don't have a spare of the big one to try with.


Edited by Feynman - 4/4/14 at 1:03am
post #4518 of 6333
Quote:
Originally Posted by spacequeen7 View Post
 

it's actually 8 Outlet Surge Protector (don't remember the name) ..I just call it power strip ,sorry 

 

I personally stick with Belkin and APC. They cost between $15-$35 depending on the unit, but to me its worth paying a bit more for a reputable name brand.

post #4519 of 6333
Quote:
Originally Posted by palmfish View Post

Quote:
Originally Posted by spacequeen7 View Post
 

it's actually 8 Outlet Surge Protector (don't remember the name) ..I just call it power strip ,sorry 

 

I personally stick with Belkin and APC. They cost between $15-$35 depending on the unit, but to me its worth paying a bit more for a reputable name brand.

That's why i recommend the Furman one which is designed for Audio/Video use
post #4520 of 6333
Quote:
Originally Posted by evertzzz View Post

excuse me Doc B., may I ask one thing? about the Crack OTL Headphone Amplifier Kit voltage input. If I order it with 240VAC power transformer, can it still be used in a place with 100sVAC?

As someone else mentioned, you would need to use a 100v to 240v stepup transformer to use a 240v Crack amp in a 100V country. Or should I say the 100v country, is 100v used anywhere besides Japan? We don't provide universal transformers because they require additional primary winding taps and terminals that significantly increase the labor cost of the power transformer. Based upon the very small number of amps that we hear of moving between different AC mains voltages this seems to be the most cost effective approach to offer our customers. Those few users who do move a piece of gear seem happy with fairly inexpensive step up or step down transformers.
post #4521 of 6333
Quote:
Originally Posted by Feynman View Post

Hi! 

I checked the volume nob, the background noise is the same regardless of position. Also tried plugging in the amp to another wall-jack and the noise was still the same. I don't even know what heater-cathode leakage is, and is it possible to check wheter my tubes suffer from that without buying new ones? 

edit: Okay tested with two different of the small tube (is this the driver tube or whatever you call it?) and the background noise is slightly higher using one of them compared to the other but still present. Unfortunaly I don't have a spare of the big one to try with.

I've found noise to be a much more prevalent issue with my various power tubes. Without a doubt, the first thing to try is picking up some cheap mil spec 6080's off ebay. There are almost always some up with buy it now + shipping for less than $10.

I have a fancy power conditioner that I used to use with my crack. When I moved the crack to another room, I found it was still dead quiet with a cheapie surge bar. My guess is that this is only really an issue if you have particularly dirty power.

As a last resort, you could try redoing the input wiring from the rca's to your pot. My braid is really tight, as depicted below. (An older pic, prior to my most recent cap upgrade) My understanding is that this can play a real role in limiting noise. Good luck!


post #4522 of 6333
Quote:
Originally Posted by olegausany View Post

That's why i recommend the Furman one which is designed for Audio/Video use

So are Belkin and APC.
post #4523 of 6333
Quote:
Originally Posted by palmfish View Post

Quote:
Originally Posted by olegausany View Post

That's why i recommend the Furman one which is designed for Audio/Video use

So are Belkin and APC.
Ok for computer but not HiFi audio
post #4524 of 6333
Your Crack must be different than mine. Mine works no matter what socket I plug it into (as long as its 120V/60 Hz).
post #4525 of 6333
Quote:
Originally Posted by palmfish View Post

Your Crack must be different than mine. Mine works no matter what socket I plug it into (as long as its 120V/60 Hz).


Ha ha same here.

post #4526 of 6333

A $100 will get you a surge protector that has some filtering. You'll spend quite a bit more for a "conditioner".

post #4527 of 6333

is anyone here using NuForce Icon HDP with Crack ?...I have the upgrade itch and was wondering if this DAC is worth pairing with El Crack ,another one I'm interested in is JDS Labs - Standalone ODAC


Edited by spacequeen7 - 4/4/14 at 2:36pm
post #4528 of 6333

I did have that combo once upon a time and thought it was quite good. Looking at your current gear though, I'd say save up for a bigger jump unless the functionality of the HDP appeals to you (like the separate headamp for low impedance headphones, preamp capabilities, digital inputs, etc).

post #4529 of 6333
Quote:
Originally Posted by spacequeen7 View Post

is anyone here using NuForce Icon HDP with Crack ?...I have the upgrade itch and was wondering if this DAC is worth pairing with El Crack ,another one I'm interested in is JDS Labs - Standalone ODAC

Never tried the ones you mentioning but getting higher end Dac does make the difference. Arcam irDac and Matrix X-Sabre are the most noticeable among those i have tried
post #4530 of 6333
Quote:
Originally Posted by spacequeen7 View Post
 

is anyone here using NuForce Icon HDP with Crack ?...I have the upgrade itch and was wondering if this DAC is worth pairing with El Crack ,another one I'm interested in is JDS Labs - Standalone ODAC


I used to use the HDP and the HRT Music Streamer II with the Crack. Both were very fine. I couldnt tell a difference.

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