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Beta 22 Gain? - Page 3

post #31 of 35
4/23/10 at 2:46am
Quote:
Originally Posted by nikongod View Post
You can drive anything from a remote if you get creative enough with gear and chain drive.

Edited:
My 5666'th post. Neat!

You can also use belt drive.
Well sure but Bent Audio already has the product ready to go and has designed the circuit. There isn't much involved though because it's a stepped attenuator. It knows what one step is even after the amp has been turned off and back on, and if you manually turn the knob. With a pot though, if you turn the knob manually the motor has no way to keep track of the last place it was at before you manually turned it, and thus the motor would keep trying to turn the pot beyond it's potential and eventually cause the motor to burn out. With the stepped motor drive, the motor is aligned to the 24 positions on the DACT. Power is only going to the motor when the button is pressed on the remote and the drive engages the next step. Once engaged, power turns off.
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post #32 of 35
4/23/10 at 8:07am
iPOD : 7-8hrs 1/12 a 1/6 of a turn with OPPO DVD Player as source and and 9hrs (1/4) with low gain dac. We use 5x gain in single end (HD650/800).
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post #33 of 35
4/23/10 at 10:42am
Quote:
Originally Posted by IPodPJ View Post
With a pot though, if you turn the knob manually the motor has no way to keep track of the last place it was at before you manually turned it, and thus the motor would keep trying to turn the pot beyond it's potential and eventually cause the motor to burn out.
Why do you ever need to touch the actual attenuator? You can mount the attenuator way in the back of the case (or smack in the middle if the layout works better that way) to minimize signal wiring lengths and always use the electronics to control it.

You could have the knob or buttons on the front face set up as another input to the control board.
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post #34 of 35
4/24/10 at 1:04pm
Quote:
Originally Posted by nattonrice View Post
I think these are about to be (or already have been) discontinued form production so if you want one you may want to step on it now.
for real? I cant find it on the alps site anymore...
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post #35 of 35
4/27/10 at 9:53am
I just want to report that I've received my amp and the gain is fine, I'm listening right now.

- Balanced Beta 22 with Gain 3 single-ended/ 6 balanced
- 128 step Twisted Pear Audio Joshua Tree Attenuator

I'm using balanced Grados and ATs as well as the HD650 and HD800.

With the AD2000, there is still some sound coming through at minimum volume. The volume knob's usable range is from the 7 o'clock minimum up to about 10 o'clock. With some quiet tracks I might go to 11 temporarily.

With the HD650, usable range goes to 1 and maybe even 2 o'clock temporarily but that is very loud for me.

For intended use with a wide range of headphones, I think this amp's gain of 3 is suitable.
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