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Old 17th October 2011, 07:40 PM   #11
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Quote:
Originally Posted by pieter t View Post
36 steps not enough?
24 steps with the good quality Elma switch is plenty enough when your socalled "gain structure" is right.
When you control volume between 8 and 10 o'clock with the pot (difference between soft and loud), yes you might be short of steps but in that case you should question gain structure of your set up.
With regard to overall volume, I agree, 36 steps is plenty, the problem that occurs with the Broskie setup is when you increase (or decrease) one side from the other in order to adjust the balance. I've already run into a scenario where the difference in volume from one step to the next is too much.

Maybe my gain structure was off but I used it with a Broskie Aikido Line Stage so one would think that they would be mated to each other.
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Old 17th October 2011, 07:47 PM   #12
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Maybe my gain structure was off but I used it with a Broskie Aikido Line Stage so one would think that they would be mated to each other.
Not necessarily so.
You should look at the complete reproduction chain:
loudspeakers (how much power do they need?also take into account your listening habits);
amplifier (how much power? input sensitivity?)
preamp/source: how much signal available?
In my experience very often there is somewhere too much gain with the consequence that volume is controlled within a small range of the pot.
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Old 17th October 2011, 10:44 PM   #13
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Pieter...

Agreed, and I will take that into account with this amp build. Bear in mind that this amp my see different sets of speakers, preamp/sources and a variety of listening conditions.

That's why I've chosen to go the pot route. I may give up a little sonically but I will be able to experiment more and get in between the cracks.
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Old 17th October 2011, 10:55 PM   #14
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Broskie's Aikido Line Stage is a flexible unit.
The first tube does the voltage gain, and it is not difficult to change tubes to optimize the gain structure.
Just an idea.
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Old 18th October 2011, 01:04 AM   #15
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Quote:
Originally Posted by pieter t View Post
Broskie's Aikido Line Stage is a flexible unit.
The first tube does the voltage gain, and it is not difficult to change tubes to optimize the gain structure.
Just an idea.
Yeah... My Aikido has been sitting around collecting dust for a while. Mine is the Aikido All in one LSA/HPA and I'm currently using 4 6CG7 tubes. I think I'll turn this one into a headphone amp as I already have 3 tube preamps. For the TSE though I'm going to do some benchtop experimentation with pots and if they work well that will be the way I'll go.

BTW... Thanks for reminding me about the Aikido. It would be nice to have an HPA in the mix and I'm pretty sure it won't take much to convert it.
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Old 18th October 2011, 02:33 PM   #16
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Default Adding a volume control to the TubeLab SE

FWIW, of all of the amps I've built (all three! ), the Tubelab SE has the lowest input sensitivity............I run everything with an powered preamp. I switch between an Anthem Pre-1 and an Aikido.
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Old 18th October 2011, 03:26 PM   #17
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Which aikido do you have?
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Old 18th October 2011, 04:34 PM   #18
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Does anyone know of an active "volume stage" that is low cost (yet decent performance) that doesn't involve a linear/log pot in the audio path? E.g. an active variable gain stage?

I'm building a Pass B-1 buffer stage, but it too calls for a pot (or stepper) in the audio path...

Dave
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