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August 18, 2019, 02:41:09 PM

Recent Posts

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11
Crack / Re: A Crack is Born
« Last post by Karl5150 on Today at 08:42:10 AM »
I like the distressed finish. Could make it a sleeper to someone not in the know who might have a chance listen.
12
Crack / Re: A Crack is Born
« Last post by Paul Birkeland on Yesterday at 06:14:15 PM »
The noise that you get with the volume pot turned all the way down is reflective of the noise floor as it relates to the circuit itself.  With the volume pot all the way up, you'll get noise contributed from the environment that gets picked up by the input wiring and the relatively high input impedance of the amp.

While the 6080 gets toasty, transformers and chokes are very heat tolerant.
13
Crack / Re: A Crack is Born
« Last post by Toad_of_Toad_Hall on Yesterday at 06:02:15 PM »
What goes in the extra holes?

Just messing around really.  Experimental placement of Hammond 159M chokes on top of the chassis. A little concerned about possible issues with heat dissipation of the power tube, but if the experiment doesn't work I can use the holes to fit an under-chassis to support chokes/caps after building a taller wooden base.

Are there any other issues you think I should be aware of?

Anyway, this is further down the track. Want to listen to the Crack in its stock form for a while. I'm not even sure if the chokes will accomplish much as I can't hear any hum at all. Nada with my T90s, even with amp turned all the way up and no music playing. That's pretty important to me as I listen to a lot of classical and other acoustic music.

Edit: I guess I could mess around with output transformers to run high-ish sensitivity, low-ish impedance headphones. Some Audio Technica woodies perhaps.
14
Crack / Re: A Crack is Born
« Last post by Paul Birkeland on Yesterday at 05:34:16 PM »
What goes in the extra holes?
15
Crack / Re: Audio Attentuator Cables / Resistance Selector Cable
« Last post by Paul Birkeland on Yesterday at 05:33:44 PM »
This won't hurt the amp, but it will reduce the available power.
16
Crack / Audio Attentuator Cables / Resistance Selector Cable
« Last post by DanceTomato on Yesterday at 04:19:28 PM »
I have an Audio Attenuation Cable Adapter made for IEMs from Ebay that can select 120, 200, & 300ohm impedance.

I have been using the Crack (non-speedball) with this cable, but I'm not sure if it is safe to do so. Will I damage the amp, tubes or the headphone by doing so?

The audio sound quality is much better with the adapter than without it. I normally use my HD600 straight to the Crack, but the AKG Q701 is really fun with the Crack.

Flow Diagram:
Dac + Pre-amp (Resonessence Herus+) -> Crack -> Audio Attenuation Cable Adapter @300 ohms -> AKG Q701(62 ohms)

17
Crack / A Crack is Born
« Last post by Toad_of_Toad_Hall on Yesterday at 03:55:47 PM »
Fun to build and a joy to listen to.

Thanks Bottlehead! My bucket list includes building every amp you produce.

Nathan
18
Crack / Re: Hissing when connected to laptop
« Last post by benzxc on Yesterday at 08:59:20 AM »
Thanks, PB. The noise occurred when the tubes were both in the socket.
19
Crack / Re: Hissing when connected to laptop
« Last post by Paul Birkeland on Yesterday at 05:53:59 AM »
If there are no tubes in the sockets, the pin contacts will move around a little bit when you shake the Crack.  You want this though, those contacts need to move when you insert a tube.
20
Crack / Re: Hissing when connected to laptop
« Last post by benzxc on Yesterday at 03:14:49 AM »
70+ hours burn-in now and the sound has no re-appeared!

Although I do have a quick question: I just turned the Crack off and flipped it around to check on the wiring and I noticed this weird sound when I flipped it over.  It sounded like there was a loose part in the Crack.  I checked like crazy everywhere to see if there may be any loose parts but didn't find any.  I could not pinpoint where the sound is coming from but the sound is not coming from the tubes themselves, and I tightened all screws as much as I could.  I shook the Crack a few times and the sound reappeared.

Could the sound be coming from the tube sockets?  I noticed that some of the sockets are very loose.

Is this something I should be concerned about, or should I just go ahead and use it and deal with it if an issue pops up?  Like I said, the Crack is functioning perfectly now.

Thanks,
Ben
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