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Old 17th May 2011, 02:54 PM   #101
generg is offline generg  Germany
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pumpkin has an amplification of ten, thought for F4 without any amplification. What input voltage does your amp need?
Maybe 1 V only?
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Old 17th May 2011, 03:04 PM   #102
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The noise is there with no input signal applied.

10 x Nothing should be Nothing. Even if the A700 has a more sensitive input ?

The Aleph isn't finished yet, the Shuntky / Pumpkins are being built in preparation for the big day.

Last edited by Andy5112405; 17th May 2011 at 03:25 PM.
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Old 17th May 2011, 03:07 PM   #103
generg is offline generg  Germany
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when your amp has also 20db amplification pumpkins amplification must be reduced.
an older ML I just googled even had 26db amplification.
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Old 17th May 2011, 04:08 PM   #104
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All this would help to explain the WHITE NOISE but not the POPPING.
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Old 17th May 2011, 04:09 PM   #105
generg is offline generg  Germany
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what is popping?

poor German...
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Old 17th May 2011, 04:14 PM   #106
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Quote:
Originally Posted by generg View Post
what is popping?

poor German...


The amplifier is making an intermittent "Pop" sound with no input attached and with the volume set to maximum.
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Old 17th May 2011, 06:16 PM   #107
Zen Mod is offline Zen Mod  Serbia
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set gain to 4-5x

try fully open pot , fully unloaded input with any tube preamp (for instance) - and you're looking for trouble

same with Pumpie
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Old 17th May 2011, 07:06 PM   #108
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As they always say, "You learn something every day".

If I had a signal applied under the conditions mentioned the Power Amp would be pushing over 60W into the speakers so you wouldn't hear the noise anyway. The only problem would be that you would hear the noise during quiet passages.

I'll leave the gain as it is for the time being as the noise may be a function of the increased gain of the A700. I'll see what it is like with the Aleph 4.

Zen-Mod, when you say unloaded input do you mean no signal or shorted input pins?
I would expect an amplifier with shorted input pins to be silent, ie amplifying nothing.

Although I rarely use the amp at full volume there will be occasions when you may wish to do so. I would not expect to hear "pops" from the speakers during the quiet passages...
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Old 17th May 2011, 07:21 PM   #109
Zen Mod is offline Zen Mod  Serbia
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problem is if you are doing those things* to highly sensitive input , as Pumpkin have ; not thinking about gain , but on sensitivity ... if I'm putting that correctly

* leaving input "open" - without source , where input is projected to work with finite source resistance . that way circ loose programmed gain , because inputs are flapping on breeze .....

I can bet that - if everything is OK - you'll not have any pops or whatever if you connect some source to Pumpkin's input , with pot where it belongs - between source and Pumpie input

Generg ( and few other builders) made similar mistake in past - using Pumpkin set to highish gain , with amps needing just line level for full throttle ..... after setting to moderate/adequate gain , problems were solved
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Old 17th May 2011, 07:36 PM   #110
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Andy do you know how to set the gain to 3-4? One way is to change the feedbackresistor from 100k to 38k-41k, or rise the 10k in the inputs to 25-30k....

Is this correct Zen?
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