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Old 19th October 2005, 09:29 PM   #1
ThomasS is offline ThomasS  Denmark
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Default Nuuk's active pre for Si T-amp...

Can the active pre run on +/- 13v? (SLA power my SI T-amp and it would be nice to do the same on the pre)

Can the gain be increased to ~6dB? (PLLXO causes some insertion loss in my bi-amp system....)

Thanks,
Thomas
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Old 20th October 2005, 06:21 PM   #2
ThomasS is offline ThomasS  Denmark
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Default more info

The pre amp is described here:
http://myweb.tiscali.co.uk/nuukspot/...nclonepre.html

The voltage is specified to 15+ v - but what about 13v....

Thomas
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Old 23rd October 2005, 10:02 AM   #3
ThomasS is offline ThomasS  Denmark
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Default output impedance?

What's the output impedance of this pre amp?
There is a 100k resistor between output and ground
is this correct?

Thomas
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Old 26th October 2005, 10:28 AM   #4
ThomasS is offline ThomasS  Denmark
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Unhappy please comment......

I could just build it and see...... BUT I would prefere some gain....
Thomas
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Old 26th October 2005, 12:07 PM   #5
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The 100k doesn't harm but would do anything either i think.
13V supply should be OK with possible a little less output level - but still enough to wildly overdrive your GC!
This is a buffer (if I got the right diagram on the site) so no gain, I'm afraid. You really need 6dB gain? How about just turning up the vol control a bit further, or rather turning it less far down?

Jan Didden
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Old 26th October 2005, 12:50 PM   #6
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Correction: The 100k ensures the output floats to gnd if connected to a capacitor-coupled power amp input.
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Old 26th October 2005, 04:17 PM   #7
Nuuk is offline Nuuk  United Kingdom
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Quote:
Correction: The 100k ensures the output floats to gnd if connected to a capacitor-coupled power amp input.
Beat me to it!

ThomasS, you may find that with the buffer in between the volume control and class-T amp that you don't actually need the extra gain!
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Old 26th October 2005, 05:15 PM   #8
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Quote:
Originally posted by Nuuk


Beat me to it!

[snip]

Wow! That was close , almost got caught with a mistake.

Jan Didden
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Old 26th October 2005, 05:31 PM   #9
ThomasS is offline ThomasS  Denmark
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Default PLLXO...

The passive line level x-over causes quite a bit of attenuation but I'll give it a try
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Old 26th October 2005, 05:50 PM   #10
Nuuk is offline Nuuk  United Kingdom
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Quote:
The passive line level x-over causes quite a bit of attenuation but I'll give it a try
Then go active! It's not really difficult. If you want to keep with the Les Sage buffer concept, then try these .

Hardly any more work than the buffers and you have your crossover filters as well!

Jan - yes, lucky to corrected that one. I've seen people shot on this forum for lesser mistakes!
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