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Crack;Bottlehead OTL - Page 313

post #4681 of 6122
Quote:
Originally Posted by dante020 View Post
 

 

As several people have already stated, make sure you jump the ground terminals - I have first hand experience with forgetting this little step, and I'll just say that the results can be quite shocking!

Yea I jumped the terminals :D Btw the PCB I have on my valab pot the R and L channels are wrong. R=L and L=R. Somebody made a mistake building the pot or just the plate is wrong. But that is not a big deal and the crack sounds wonderful :) Received my CBS 5814A tube too. Happy days :beerchug:

post #4682 of 6122
Crack ordered. Mod parts starting to arrive. Anticipation growing....
post #4683 of 6122

^^ did you get custom caps?

post #4684 of 6122
Have ordered the following
Obbligato gold 94 uF
Teflon 10uF
Jupiter Beeswax 1uF
Solen 220uF
post #4685 of 6122

Seeing some of the finishes on these amps has really got me wanting to build another one, but this time anticipating the oversights and after-thoughts from the first time around. I really like the look of the hammered paint that everyone's using :cool: 

post #4686 of 6122

It's been about 3-4 years now with the Crack amp since I had built it.  I noticed some infrequent and random crackling in the left channel over the past few months.  Switched out tubes and that didn't make a difference.  So I decided to take a paint brush and touch all of the connection points, figuring some dust or hair may be setting it off.  All appears to be fine now.  Just wanted to post my thoughts if anyone else comes across this... I suppose it's the trade off of building a great sounding kit without a full enclosure.

 

Maybe one of these days I'll build a different base for it, who knows! :)

post #4687 of 6122

Any enclosure would still need cooling slots or holes that would allow dust in. Cleaning out any audio gear every few years is a very good idea. You should have seen the dust buildup on the insides of some of the 60 year old antique radios I have restored. Scary.

post #4688 of 6122
Quote:
Originally Posted by MoatsArt View Post

Have ordered the following
Obbligato gold 94 uF
Teflon 10uF
Jupiter Beeswax 1uF
Solen 220uF

 

Wow - that's some combo!  Are there 94uF Obbligato golds now or are you doubling up on the 47's on each channel?

post #4689 of 6122
Doubling up on 47 uF for each channel (94 / channel)

Teflons are RTI Electronics

can't get Jupiter HTs atm, so they will have to wait.

The Crack of Dawn MkII has to compete against MkI for capacitor real estate boasting rights!
Edited by MoatsArt - 4/18/14 at 12:55am
post #4690 of 6122
Quote:
Originally Posted by MoatsArt View Post

Doubling up on 47 uF for each channel (94 / channel)

Teflons are RTI Electronics

can't get Jupiter HTs atm, so they will have to wait.

The Crack of Dawn MkII has to compete against MkI for capacitor real estate boasting rights!

 

Get those RTI teflons in the burn in rig asap the first 450hrs have been a bit of a torture test fitting them while they are not burned in fully. With about 500hrs on mine so far, though massively improved and now listenable the sonics are swinging from amazing to the bass sounding a loose. I wondered if it was smearing at first but as it comes and goes I don't think it is just need more burn in time perhaps due to the lower loadings with a head-amp.  Hearing lots of new things that I had not noticed before such as backing vocals splitting into distinct individuals new instrument etc. But it has been frustrating due to taking so long.


Edited by JamieMcC - 4/18/14 at 1:31am
post #4691 of 6122
500 hour burn in? Crikey!
Edited by MoatsArt - 4/18/14 at 2:13am
post #4692 of 6122

Nice surprise today a courier dropped off a package containing one of my favourite tubes types for the Crack. Six nos Mullard 6080's :tongue_smile: As a relative newbie to tubes I find  unwrapping a original nos tube is still a bit of a novelty!

 

 

post #4693 of 6122
Quote:
Originally Posted by JamieMcC View Post
 

Nice surprise today a courier dropped off a package containing one of my favourite tubes types for the Crack. Six nos Mullard 6080's :tongue_smile: As a relative newbie to tubes I find  unwrapping a original nos tube is still a bit of a novelty!

 

 

 

 

nice ....want :o 

post #4694 of 6122

Where did you get them from Jamie? Nice...

post #4695 of 6122

Nic from a contact I made via a ebay purchase.   

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