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Roll Call: Who's building, built, or thinking of building a beta22? - Page 8

post #106 of 2875
7/19/07 at 4:37am
even with parts count, this is an easy project. you have a PCB provided with labels for components. how hard can it be?

if you can read, you can built this one!
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post #107 of 2875
7/19/07 at 9:42am
Quote:
Originally Posted by jarthel View Post
even with parts count, this is an easy project. you have a PCB provided with labels for components. how hard can it be?
if you can read, you can built this one!
You might be able to build it, but if you have any issues you might have a hard time fixing it. And there are a lot of similarly shaped components which has been known to throw the novice builder.

Quote:
Originally Posted by jarthel View Post
be careful though. I have ask Russ White about the joshua tree attentuator and it seems to be similar to a shunt attenuator not series/ladder.
I'm curious, what is your concern here?
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post #108 of 2875
7/19/07 at 10:43am
Quote:
Originally Posted by n_maher View Post
You might be able to build it, but if you have any issues you might have a hard time fixing it. And there are a lot of similarly shaped components which has been known to throw the novice builder.

I'm curious, what is your concern here?

x2 I was about to order one for the b22 i'm building, thinking it would be cheaper/better than a standard stepped attenuator....
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post #109 of 2875
7/19/07 at 11:06am
Thread Starter 
As for the similarly shaped parts issue, it's really a non-issue with the way Twisted Pear labels their kits, every part is labeled with a label stating the Part number that's silk screened on the actual pcb and item description. Makes stuffing the pcb a simple affair of connect-the-dots, imo
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post #110 of 2875
7/19/07 at 11:20am
Quote:
Originally Posted by jarthel View Post
even with parts count, this is an easy project. you have a PCB provided with labels for components. how hard can it be?

if you can read, you can built this one!
As Nate said, the sheer parts count drives up the odds for mixing up parts, but it also means higher odds for having bad solder joints. I spent two days assembling boards for two 3-channel amps. I consider myself a seasoned pro when it comes to soldering (been doing it for over 30 years) and I still managed to miss one solder joint on a board.

As evidenced by some of the posts over on Headwize, troubleshooting this amp isn't easy.
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post #111 of 2875
7/19/07 at 11:25am
Quote:
Originally Posted by n_maher View Post

I'm curious, what is your concern here?
shunt attenuators works differently than your ordinary log pot or series/ladder attenuator. check goldpt.com for explanation
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post #112 of 2875
7/19/07 at 11:29am
Quote:
Originally Posted by gates_2 View Post
x2 I was about to order one for the b22 i'm building, thinking it would be cheaper/better than a standard stepped attenuator....
looking at percy's catalog, he sells an elma switch + a set of holco resistors for only $76. definitely cheaper than the joshua tree (by $6) and less real estate too

up to you I suppose, it's your project

http://www.goldpt.com/how.html
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post #113 of 2875
7/19/07 at 11:44am
Thread Starter 
Is the elma switch usable for a 4 channel balanced beta22? That's the main reason I've been looking at the JT attenuator, doesn't seem balanced stepped attenuators come very cheap....
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post #114 of 2875
7/19/07 at 12:50pm
I have two elma stereo switches I stuffed with resistors for my Beta22 (ask jrossel about it).
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post #115 of 2875
7/19/07 at 1:00pm
Thread Starter 
Ah yes, but I want a single volume knob for my balanced output, and two separate volume knobs for the SE outputs.....at least that's what I'm dreaming of. How, to get there....I'm still researching
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post #116 of 2875
7/19/07 at 2:27pm
Quote:
Originally Posted by jarthel View Post
shunt attenuators works differently than your ordinary log pot or series/ladder attenuator. check goldpt.com for explanation
I'm aware of the differences and based on my understanding I don't see any reason why the JT attenuator wouldn't work fine on the input of a beta. Granted, I'm not the most technically inclined person so any further explanation would be greatly appreciated.
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post #117 of 2875
7/19/07 at 2:31pm
Quote:
Originally Posted by Nebby View Post
Ah yes, but I want a single volume knob for my balanced output, and two separate volume knobs for the SE outputs.....at least that's what I'm dreaming of. How, to get there....I'm still researching
I'm sure it can be done, but it doesn't strike me as at all practical or elegant.
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post #118 of 2875
7/19/07 at 3:17pm
Thread Starter 
Quote:
Originally Posted by n_maher View Post
I'm sure it can be done, but it doesn't strike me as at all practical or elegant.
pretty much what I've come to conclude, but I can always dream in the mean time
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post #119 of 2875
7/19/07 at 8:55pm
Quote:
Originally Posted by n_maher View Post
I'm aware of the differences and based on my understanding I don't see any reason why the JT attenuator wouldn't work fine on the input of a beta. Granted, I'm not the most technically inclined person so any further explanation would be greatly appreciated.
the question has nothing to do with the preamp/headphone amp. It has something to do with the source.

since a shunt attenuator input impedance varies, the load seen by the source varies as well. it's easier for a source to drive 100K vs 10k input impedance. the sound might sound different (not just louder or softer) as well when changing position.

if you want something similar to series/ladder, try electronics.dantimax.dk. I bought his RelVol1C. cheaper than the joshua tree too
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post #120 of 2875
7/19/07 at 11:25pm
picked up the Relvol1c.... looks cool, and you can use a remote control with it :-D
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