[johnwmclean]

Quote:

Originally Posted by nattonrice /img/forum/go_quote.gif You can "tune" the feel of the steps by using different sized knobs.

Good Point! The knob makes a big difference to the action, the weight as well as the diameter alters the feel. The best result I’ve had so far is by using an actual DACT knob.

 

[Lil' Knight]

I'm not sure if the DACT has enough steps for me. I tried to look for the RK40 but no success so far. Might be I'll just go with the TKD 2511.

 

[Magsy]

I had my reservations about the limited number of steps but I have genuinely not even thought about it since I have built the amp. It really is a non issue, I don't ever find myself between steps or wishing for more granularity.

I plug the HD650 in and I'm using 50%-85% range and when I plug the SA5000 in I'm using 30%-60% range.

I have a gain of 2 but 4 effective because I'm balanced, also have a 4v source.

With a big knob the steps feel awesome and subtle, with a smaller knob it just feels tight and very high precision....choose your poison!

 

[jh4db536]

have you considered using the TPA JTA? you get 128 steps. the disadvantage is the extra space that it takes up and complexity.

 

[oneplustwo]

The JTA also make a pretty loud clicking when changing volumes. Doesn't really create any problems, but it is something to know.

 

[Lil' Knight]

Quote:

Originally Posted by jh4db536 /img/forum/go_quote.gif have you considered using the TPA JTA? you get 128 steps. the disadvantage is the extra space that it takes up and complexity.

I did but after weighing up the pros and cons, I'd simply go with a 'classic' pot.

I have a custom made knob which weighs ~500g

 

[linuxworks]

you can always add a relay module later on, even in series with the amp. simply turn the volume pot all the way up and its -mostly- out of the circuit, then.

 

[Lil' Knight]

Anybody knows the tightest case that can fit the e22 and 1.5" heatshink?
I really like the ATI case but looks like they are out of business now

 

[jtostenr]

Quote:

Originally Posted by linuxworks /img/forum/go_quote.gif I did exactly that - to parallel the input wires with some outputs that go to my sub. in fact, I go thru a 2nd vol control so that I can remotely control sub volume. you may want a LP filter or band split (hp/lp) or just use the one in the sub. but yes, a passthru has good use for subwoofers. passthru is just a y-cable, folks

Just wanted to clear something up w.r.t. loop-outs, preamp outs and subwoofers. I'd rather not have to hack my B22 apart later to fix the loop-out/preamp-out.

So if I understand this correctly, the standard definitions are:

loop out = no amplification, no volume control
preamp out = with amplification and volume control

Which makes me wonder, if I do not want a separate volume control for my sub, then I must connect it to the preamp out. However, is this signal too hot for a powered sub?

 

[tintin47]

^^Your custom knob weighs 500g, as in 1.1lbs? Even if it were made out of steel, it would have to be stupidly large, like 6 cm in diameter. Why would you want something that big?

 

[UKToecutter]

Gee,

That's a big knob

 

[quattro98]

A powered sub should take line-level inputs, the same as the amplifier for your main speakers, so the pre-amp outputs should be fine.

Quote:

Originally Posted by jtostenr /img/forum/go_quote.gif Just wanted to clear something up w.r.t. loop-outs, preamp outs and subwoofers. I'd rather not have to hack my B22 apart later to fix the loop-out/preamp-out. So if I understand this correctly, the standard definitions are: loop out = no amplification, no volume control preamp out = with amplification and volume control Which makes me wonder, if I do not want a separate volume control for my sub, then I must connect it to the preamp out. However, is this signal too hot for a powered sub?

 

[Lil' Knight]

Quote:

Originally Posted by tintin47 /img/forum/go_quote.gif ^^Your custom knob weighs 500g, as in 1.1lbs? Even if it were made out of steel, it would have to be stupidly large, like 6 cm in diameter. Why would you want something that big?

It's only 40mm x 40mm. Not really big but damn heavy. And yes, it's made of solid steel.

 

[pistolsnipe]

hey, i've been looking into a chassis for my build as of late, and this one doesn't quite fit my bill (looking for 3 inch tall max), but it seems pretty awesome and is dirt cheap, so i thought i would share my find

Metal Project Boxes

(top link)

 

[askforwhy]

Quote:

Originally Posted by linuxworks /img/forum/go_quote.gif well, not to insult, but I've zapped a few caps when I forgot to discharge them. so its easy for people to forget I did, more than once! as a matter of course, I simply replace all MOSFETS and .47ohm r's. I don't even bother checking the .47 r's. I just replace them.

You're welcome, linuxworks.
Well I've replaced several MOSFETs. Because the Q2 in my Sigma22s was dead and I didn't find out at first, I just kept buring MOSFETs after I replaced them.
I also checked one of my Beta22s is failure right before I powered up. One zener diode was blown and the MOSFETs were dead.
Now everything is fine and I stll have a long way fighting against the hum nosie. Guess I will replace the trafos next step.