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Crack;Bottlehead OTL - Page 236

post #3526 of 5826
Quote:
Originally Posted by skeptic View Post
 

Doesn't mean you couldn't be even happier if you eliminated the microphonics though! 

 

You should be able to pick up a decent mil spec 6080 or 2 on ebay for <=$20.  Not as sexy to look at as the curvy glass 6as7g's, but they are generally nice quiet tubes designed to handle some abuse and vibrations.  Search for "jan 6080" - and there are several different lots akin to: http://www.ebay.com/itm/Tube-2ea-6080-RCA-1ea-JAN-6080WB-Sylvania-tstd-amp-radio-amplifier-ham-/390746501948?hash=item5afa4e733c

 

I don't know. I know some who prefer a slightly microphonic tube. Theory is that it has an ever so slight widening/echoing effect.

post #3527 of 5826
Quote:
Originally Posted by Loquah View Post


Good idea. The T1 is a good DAC for its price so you won't get a lot better without spending more money.


T1 adapter faulty.:mad:

 

BTW, Cracky progress:

post #3528 of 5826
Looks great. What did you do to the chassis plate?
post #3529 of 5826
Quote:
Originally Posted by Loquah View Post

Looks great. What did you do to the chassis plate?

Thank you... It's just painted with a can spray. I ask some guy to build for me from A to Z. His initial plan is hammerite black finished for the aluminum plate but seems like the paint not suitable for the aluminum. Black powder coating too expensive, midnight silver spray can very hard to find. So end up with this brown.

 

BTW, any particular reason why use media monkey player? And why you sell your Crack?


Edited by diaBoliQu3 - 1/15/14 at 5:52pm
post #3530 of 5826

I put together a crack+speedball and I was very happy with the result. Curiosity got the better of me so I got a hold of a wa2. I did serious A/B testing with the two and I'm shocked that the crack is every bit as good as the wa2. For the price of the wa2 I was expecting it to be a big improvement. The crack is amazing no doubt.


Edited by lljayll - 1/15/14 at 6:08pm
post #3531 of 5826
Quote:
Originally Posted by diaBoliQu3 View Post
 

Thank you... It's just painted with a can spray. I ask some guy to build for me from A to Z. His initial plan is hammerite black finished for the aluminum plate but seems like the paint not suitable for the aluminum. Black powder coating too expensive, midnight silver spray can very hard to find. So end up with this brown.

 

BTW, any particular reason why use media monkey player? And why you sell your Crack?

 

I use MediaMonkey because I find it has the best library management tools. I tried JRiver and Foobar, but MM is just better with its automated library management in my experience.

 

The only reason I'm selling the Crack is because the Mainline is very similar in its signature and presentation, but also a little better (as you'd expect for the price). I want to free up some funds to buy new cans for now, but I can actually see myself either hanging on to the Crack if I don't get an offer soon or I might sell it now and buy another one later for full custom treatment... we'll see. It's not a reflection on my love for the amp though - it's brilliant.

post #3532 of 5826
^ I use Media Monkey too - its so much better than iTunes for managing my music files for my iPods
post #3533 of 5826

Has anyone here heard of the Megahertz 6080 OTL? Aesthetically at least it looks very similar to the bottlehead crack:

 

http://www.megahertzaudio.it/otl_con_una_6080.htm

 

The schematics of this amp is on the page. For people familiar with the schematics of the BHC, does the design look similar? It's retailing for around 490 EUR assembled and I hear it's well regarded in Italy, so I'm wondering if it's a good alternative to the BHC for people in Europe.

post #3534 of 5826
Quote:
Originally Posted by PTom View Post

Has anyone here heard of the Megahertz 6080 OTL? Aesthetically at least it looks very similar to the bottlehead crack:

http://www.megahertzaudio.it/otl_con_una_6080.htm

The schematics of this amp is on the page. For people familiar with the schematics of the BHC, does the design look similar? It's retailing for around 490 EUR assembled and I hear it's well regarded in Italy, so I'm wondering if it's a good alternative to the BHC for people in Europe.

I wish I were better at reading schematics because a lot of that looks extremely similar. Can't wait to hear from others. I hope they haven't copied BH.
post #3535 of 5826
Quote:
Originally Posted by Loquah View Post


I wish I were better at reading schematics because a lot of that looks extremely similar. Can't wait to hear from others. I hope they haven't copied BH.

From the way it looks, my thoughts were that there might have been some influence. 

post #3536 of 5826

Guys, I wonder if can mod Crack to balanced output just like FiiO X3 mod their unit:

http://www.head-fi.org/t/651769/the-fiio-x3-thread/7965#post_10171179

post #3537 of 5826
Quote:
Originally Posted by Loquah View Post


I wish I were better at reading schematics because a lot of that looks extremely similar. Can't wait to hear from others. I hope they haven't copied BH.


Nope, its pretty different. But OTL designs are all pretty similar and tube based circuits period are very old and fairly simple, so many of them look very similar.

post #3538 of 5826

It's not a copy of the Crack. It is not a direct coupled circuit, it does not use a constant current source for biasing the first stage. It also uses a different input tube. And of course it does not have the Speedball upgrade available. 

post #3539 of 5826
Quote:
Originally Posted by diaBoliQu3 View Post
 

Guys, I wonder if can mod Crack to balanced output just like FiiO X3 mod their unit:

http://www.head-fi.org/t/651769/the-fiio-x3-thread/7965#post_10171179

 

Not really... but if you really want you can add a 4-pin XLR and connect it with the TRS via... tip = pin1, ring = pin3, sleeve = pin2 AND pin4.

post #3540 of 5826

Thanks for the tips on insulating my cap leads guys I ended up just stroking the shrink tube with the soldering iron which though not ideal did work.

 

After de-soldering & re-soldering the cap leads to put the shrink tube on I was down to my last inch of Cardas quad eutectic solder. I initially brought 3 feet for the Crack build, this turned out to be plenty for the standard Crack + Speedball and I was pleased to have just enough left over to solder in the new cables for the Valab attenuator and add the new film caps.

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