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Old 18th November 2007, 05:27 PM   #51
Manu is offline Manu  Europe
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Sasha,
I wan't some of these hudgely hugly pcbs too.
Excitement not any more under control.
Pada li snijeg un srbiji like in Betsch?




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Old 18th November 2007, 05:30 PM   #52
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Quote:
Originally posted by Zen Mod
just imagine xformer instead of ; both prim and sec CT-ed .

Yes, that's a great analogy.

But what trips me up is which secondary tap to use if I want inverting. We've got + and - inputs and probably only want a + out relative to ground. I think. So my mind tells me to ground the negative tap.
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Old 18th November 2007, 06:02 PM   #53
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ZenMod:
Quote:
be careful - using with F4 oriented gain setting - with other amps
Hmmm... Actually i am having BIG problem driving my LeachAmp with ... I must say that i never tried it before i attached my inputselector... hmmm donno right if that's the problem ... will learn more next few day's i guess ... it's irritating but fun too ....

I attached my LeachAmp... and the inputselector/pumpkin is a GIANT disortion machine.... GREEEAT hummming reallly great!

I haven't yet tried the with my dreky inputselector and my F4... btw.

Will tell, about problem in few day''s...

Carpenter:
Quote:
But what trips me up is which secondary tap to use if I want inverting. We've got + and - inputs and probably only want a + out relative to ground. I think. So my mind tells me to ground the negative tap.
I am pretty sure, it dosent matter... but anyway i would choose to gnd the -out...

Jesper.
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Old 18th November 2007, 06:39 PM   #54
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Quote:
Originally posted by lykkedk
....i would choose to gnd the -out...

Jesper.

Thanks for that. Even though I haven't a solid idea as to why, it just seems to make intuitive sense to have a + out relative to ground.

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Old 18th November 2007, 06:46 PM   #55
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Quote:
Originally posted by Zen Mod



where is the fun if I tell you everything?



just imagine xformer instead of ; both prim and sec CT-ed .



Quote:
Originally posted by carpenter



Yes, that's a great analogy.

But what trips me up is which secondary tap to use if I want inverting. We've got + and - inputs and probably only want a + out relative to ground. I think. So my mind tells me to ground the negative tap.

take literally what I wrote ;

if you want absolute phase in puritan way then ground + output and use - as main one .
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Old 18th November 2007, 09:59 PM   #56
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Quote:
Originally posted by carpenter



When you say, "absolute phase in puritan way", do you mean that preamps don't invert, or they do invert?

It can get complicated very quickly if one has many amplifiers that invert, or don't invert the output signal. Do most amps invert?
woodie - it's not hard to me that I repeat some thing 1000 times , but you must learn to trust own eyes more .........

you have + and - inputs ;
you also have + and - outputs ;




they are labeled in that manner with purpose

so - if I wrote drek on forum - because I'm tired or because my brain is in red ......... trust to your own eyes ;


on input ground "-" leg , and use it unbalanced

on output ground "-" leg and use it unbalanced

in that case absolute phase is correct, not as I wrote previously .......

what I meant with previous post (where I wrote that you can ground whatever you want ) is exactly that - ground whatever you want and have phase as you wish .........


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Old 18th November 2007, 11:51 PM   #57
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I'm currently operating a balanced, bi-amped stereo.

In the interest of economy, I wish to use unbalanced F4 for treble horns.

I wish to use mono balanced F4 for midbass units (dual 12" Eminence per channel) where I can use more wattage.

I've considered using Pumpkin for midbass F4 where I can use the extra gain. For the treble, I can use the electronic crossover, or my xbosoz.

You can see where operating balanced with unbalanced configurations can become confusing.
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Old 19th November 2007, 03:28 AM   #58
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In the interest of economy, I wish to use unbalanced F4 for treble horns
Why not look at the Babaleph J for the horns?
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Old 19th November 2007, 03:46 AM   #59
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Quote:
Originally posted by mpmarino


Why not look at the Babaleph J for the horns?

Darn good question. Tell me more.......
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Old 19th November 2007, 04:09 AM   #60
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Quote:
Originally posted by carpenter



Darn good question. Tell me more.......

There's only so much I can say. Nelson's Aleph J or Choky's Babelfish J (almost the same) are both balanced topology. You could probably build yourself a nice 'mini' and keep the whole shebang balanced.

sorry for the OT post



Hey Choky,

Re: fancy pants shunty reg. Is 82v CT tranny the ABSOLUTE MINIMUM for +-36v? I'm seeing what I have 'in drawer'. Greedy boys don't like to spend money





edit: Carpenter - my pump boards came USPS registered mail. I had to sign. I see you asked a while back.
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