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

[jarthel]

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!

 

[n_maher]

Quote:

Originally Posted by jarthel /img/forum/go_quote.gif 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 /img/forum/go_quote.gif 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?

 

[gates_2]

Quote:

Originally Posted by n_maher /img/forum/go_quote.gif 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....

 

[Nebby]

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

 

[kklee]

Quote:

Originally Posted by jarthel /img/forum/go_quote.gif 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.

 

[jarthel]

Quote:

Originally Posted by n_maher /img/forum/go_quote.gif 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

 

[jarthel]

Quote:

Originally Posted by gates_2 /img/forum/go_quote.gif 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

 

[Nebby]

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....

 

[fierce_freak]

I have two elma stereo switches I stuffed with resistors for my Beta22 (ask jrossel about it).

 

[Nebby]

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

 

[n_maher]

Quote:

Originally Posted by jarthel /img/forum/go_quote.gif 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.

 

[n_maher]

Quote:

Originally Posted by Nebby /img/forum/go_quote.gif 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.

 

[Nebby]

Quote:

Originally Posted by n_maher /img/forum/go_quote.gif 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

 

[jarthel]

Quote:

Originally Posted by n_maher /img/forum/go_quote.gif 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

 

[gates_2]

picked up the Relvol1c.... looks cool, and you can use a remote control with it :-D