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Crack;Bottlehead OTL - Page 356

post #5326 of 7978
I Wish I could spend time modding my crack, but I have too many projects going on. So sad to see all the discussions that I can't partake in frown.gif
post #5327 of 7978

Hey guys, I'm selling my crack! Not sure what's a reasonable price, but I'm short on cash.

 

http://www.head-fi.org/t/723933/bottlehead-crack-with-speedball

post #5328 of 7978
Quote:
Originally Posted by Doc B. View Post

Yeah I would agree that upgrading the attenuator would probably be the most rewarding upgrade after the Speedball. In order to address that we are working on the idea of using a Submissive passive attenuator ahead of the Crack and replacing the stock pot in the Crack with an adjustable crossfeed circuit that can be defeated for those who don't want it in the signal path. We found that designing our own attenuator gave us the best results vs. using other available high end attenuators, and the best sounding stepped attenuators tend to be bigger than the Crack chassis can accomodate. So the Submissive in its own chassis that matches the Crack chassis may have some appeal to those who have the space for a second chassis in their setup.

We will be running some tests on a crossfeed circuit in the next few weeks.

Oh, and thanks for the order!

Very interesting! I have actually been thinking about doing something similar to this for a while. I'm don't like how to stock pot handles channel imbalance at the lower levels. Been think about throwing a passive preamp upstream to let me turn the pot higher. Taking it completely out of the equation sounds even better. Would turning the stock pot to max and then throwing a passive preamp upstream be essentially the same thing?
post #5329 of 7978

Yeah, turning the pot up all the way pretty closely emulates a simple grid load resistor at the input, except of course that there are wiper contacts and a carbon track rather than a simple metal film or whatever resistor. On paper that may not make any difference, but the whole point of the conversation in the first place is about changing the resistive materials to improve the sonics. If you are going to go to the trouble to put an attenuator with high quality resistors in ahead of the pot it might make more sense to swap the pot for a 100K ohm MF resistor.

post #5330 of 7978
Quote:
Originally Posted by Doc B. View Post


Technically, sure you could do that. Not sure if it would sound better, as my philosophy has always been to use as few gain stages as possible. I admit to being surprised by the recent raves about putting a Quickie ahead of a Crack. I guess I need to play with that myself. We're certainly happy to sell them to anyone who finds that to be a sound that they prefer.

I'm very pleased with Quickie ..skeptical at first (Thanks to Matt and one of his posts) but I'm so glad it's finally here  ,swapped few tubes since I build it and I have to say that Quickie/PJCCS=> Crack/GEC A1834/E80CC Philips =>HD650 sounds superb , it made some tubes shine more then others ,this upgrade is worth every penny  

post #5331 of 7978
Quote:
Originally Posted by spacequeen7 View Post
 

I'm very pleased with Quickie ..skeptical at first (Thanks to Matt and one of his posts) but I'm so glad it's finally here  ,swapped few tubes since I build it and I have to say that Quickie/PJCCS=> Crack/GEC A1834/E80CC Philips =>HD650 sounds superb , it made some tubes shine more then others ,this upgrade is worth every penny  

:D...just trying to spread the love. 

post #5332 of 7978
post #5333 of 7978

Listening to Sgt. Pepper's with the Crack and the HD 800. I have never heard this clarity and detail from the album before.

post #5334 of 7978

This waiting time is killing me.....:(

I already have the aluminum plates cut for the crack and no amp yet.

post #5335 of 7978
Quote:
Originally Posted by i luvmusic 2 View Post
 

This waiting time is killing me.....:(

I already have the aluminum plates cut for the crack and no amp yet.

Patience! It will be worth the wait.

post #5336 of 7978
Quote:
Originally Posted by BiggieSmalls88 View Post
 

Patience! It will be worth the wait.

I hope so.:biggrin:

I have another idea about this Crack i might build it stock and if i really like it i will build another crack using all upgraded parts and sell the stock crack.IMHO instead of squeezing all those big caps choked etc etc inside the crack case mind as will start from the scratch all you really need is plates wood some screws holesaw jigsaw drill/drill press(which i have) drill bits and a bit of know how to work with metals and wood.


Edited by i luvmusic 2 - 6/21/14 at 7:22pm
post #5337 of 7978

Hi There!

 

I am rechecking my voltages after an issue I had. I can't recall how I resolved this question: 

 

I don't understand the instructions 5 and 6 on page 38. If I use the negative probe clip to connect to terminal 12, how can I connect the same lead to the ground buss?

 

What is the ground buss? Is that the negative port on my multimeter? 

post #5338 of 7978

Just posting a picture of my multimeter and ensuring I should be completing voltage checks with the leads connected like that, and with the dial set as such.

post #5339 of 7978

Well I just did what I thought was ok, and everything seems ok. Things showing as 0 are showing as 1.8mV, I presume that is ok ? It's strange to me that slightly changing the angle of the contact on a terminal changes the voltage massively. 

post #5340 of 7978

Most probably the best place for assistance on interpreting the manual or trouble shooting is on the Bottlehead Forum where you will find support provided direct from the Bottlehead team who designed the Crack and wrote the manual.  I suspect some of us might interpret written instructions differently so getting it straight from the horses mouth so to speak is the way to go imho.

 

I hope you have enjoyed the build so far and welcome to the Crack club.

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