Crack Addiction - updates?

Dr. Toobz · 12430

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Offline Jim R.

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Reply #15 on: April 24, 2010, 11:07:07 AM
Thanks, Paul.  How much room is there in the corner by the volume pot?  Enough to get one of the TKDs in there -- maybe with a little creative metalwork on the top plate?

-- Jim

Jim Rebman -- recovering audiophile

Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).

s.e.x. 2.1 under construction.  Want list: Stereomour II

All ICs homemade (speaker and power next)


Offline Todd R

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Reply #16 on: April 24, 2010, 11:31:41 AM
When do you think the Speedball will be ready to ship?



Offline Paul Birkeland

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Reply #17 on: April 24, 2010, 12:57:52 PM
I would guess that the Speedball will be ready in 30-90 days.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline Doc B.

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Reply #18 on: April 24, 2010, 02:10:36 PM
Actually I'm shooting for the 30 day end of that estimate, or sooner. We just need to order some PC boards and a few other parts and get the manual written. I'll try to get a pre-order page up on the shopping cart next week.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.


Offline Todd R

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Reply #19 on: April 24, 2010, 04:10:18 PM
How much was it supposed to cost?



Offline Jim R.

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Reply #20 on: April 29, 2010, 07:42:18 AM
Regarding the C4S upgrades, if you had to choose one would it be the voltage amp tube or the cathode follower?  Which one makes the most difference?

Thanks,

Jim

Jim Rebman -- recovering audiophile

Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).

s.e.x. 2.1 under construction.  Want list: Stereomour II

All ICs homemade (speaker and power next)


Offline Paul Joppa

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Reply #21 on: April 29, 2010, 07:52:52 AM
Regarding the C4S upgrades, if you had to choose one would it be the voltage amp tube or the cathode follower?  Which one makes the most difference?
Until someone does the experiment, all we can do is guess.

Normally, I'd say the cathode follower, but that's based on experience with preamps where the load impedance is high. Since the Crack has a low-impedance (headphone) load, the C4S won't increase the net load impedance very much at all. So I'd guess the voltage amp stage C4S will have the greater effect.

But what you hear does not always correspond to your theories, so I'd rather withhold judgment until we have some actual experience.

Paul Joppa


Offline Jim R.

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Reply #22 on: April 29, 2010, 07:57:12 AM
Paul,

Thanks.  Guess we'll just have to wait though I wonder how many folks would try one without the other.

I'm trying to keep things running  as cool as possible, and if the CF CCS isn't a huge improvement over the VA alone, then I may just skip it.

-- Jim

Jim Rebman -- recovering audiophile

Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).

s.e.x. 2.1 under construction.  Want list: Stereomour II

All ICs homemade (speaker and power next)


Offline Doc B.

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Reply #23 on: April 29, 2010, 08:07:31 AM
In the first example I built I think the VA load had a little more impact than the CF load, but using both sounded best. As for heat, whether it's cathode and plate resistors or active loads there will be more or less the same amount of heat under the hood. Going from one to the other doesn't really increase the current draw enough to make a big difference, not like adding a shunt regulator with a bunch of additional current draw and increased B+ might.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.


Offline ironbut

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Reply #24 on: April 29, 2010, 08:40:06 AM
Thanks, Paul.  How much room is there in the corner by the volume pot?  Enough to get one of the TKDs in there -- maybe with a little creative metalwork on the top plate?

-- Jim


I put one of the conductive plastic TKD's in mine and with just a little time with a rat tail file, it fit the stock hole no problem. Unfortunately, the pot that I used was from an old project of mine and it was history so I need to order another one. Be advised, the length of the shaft is much longer but with the application of some spacers on the bottom, the knob sits just a little higher than it did originally.

steve koto


Offline Jim R.

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Reply #25 on: April 29, 2010, 08:48:25 AM
Doc,

Thanks, and as long as the heat is roughly the same, no need to worry here.

Steve,  Thanks, I did some fiddling with this yesterday and came to the same conclusion -- that I could either drill or file out the existing hole and then file a notch for the index tab.  I'd also cut the shaft down a bit and use a nice quilted maple knob I have, or leave it as-is and use one of the big audio note gold knobs I also have.

-- Jim

Jim Rebman -- recovering audiophile

Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).

s.e.x. 2.1 under construction.  Want list: Stereomour II

All ICs homemade (speaker and power next)