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Old 7th February 2012, 12:02 PM   #621
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Real speakers aren't resistors and have a rising impedance at low frequency. I would not necessarily interpret the graph as meaning "worse bass". Have a look at some THD vs. Frequency graphs for pricey 300B amps.

With 101dB speakers you're probably fine as is. It's all up to you.

For those considering various iron-core inductors, this amplifier uses an air-core inductor to avoid saturation.
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Old 7th February 2012, 12:13 PM   #622
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How will that affect the output impedance?
The output impedance is around 8 Ohms.
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Old 7th February 2012, 04:39 PM   #623
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For those considering various iron-core inductors, this amplifier uses an air-core inductor to avoid saturation.
lundhal has a 100mh C Core filament choke 3,4A (5,4 A saturation) , do you think it could fit the sit?
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Old 7th February 2012, 04:44 PM   #624
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....... I'm going to read over that tonight.

.....
so - any comment ...... or plan ?



you can try that with any proper mosfet , too ..... or smaller SIT

plain SE , parafeed , whatever .....

edit: shade-ed mosfet , too
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Old 7th February 2012, 04:47 PM   #625
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lundhal has a 100mh C Core filament choke 3,4A (5,4 A saturation) , do you think it could fit the sit?
Aren't you the guy who doesn't want to use an inductor?

Post a part number.
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Old 7th February 2012, 04:51 PM   #626
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i'm the guy who wants to play alone in his garage far for a screaming family

the lundahl 100mh 3,4a is the LL2733
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Old 7th February 2012, 04:52 PM   #627
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so - any comment ...... or plan?
I knew I forgot to do something. I'll will check it out tonight.

Tell NP not to post F5 Turbo and distract me.
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Old 7th February 2012, 04:57 PM   #628
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...Some time back I played with the ZenV9 circuit using a big Hammond choke load instead of Aleph. Actually, I think it worked quite well. But, 1 thing that it did do that is somewhat of a problem is it made physical, vibrational noise with signal. It was a frequency/amplitude sesitive thing (maybe started around 3k?) but, quite audible. I believe they were spec'd well enough for this amp (3-5A, .64 ohm, 100+mH IIR)
You might never notice this phenomina unless you test with a resistor load. Have you noticed this problem? Can you hear your amp without any speakers?
I don't know if it's the E-Core Lams or the windings or? I wonder if impregnating epoxy resin into the windings will stop this or?...
Yea, that was a 5A PSU choke in the 195 series, I believe, w.64ohm DCR. I was probably doing 1.5-3A Iq. The trouble is the liniarity of the core. It is "metal" lams and it needs to be alloy bla bla or somethjing else designed for higher freq.s than 60Hz? And, empregnated with High tech resin stuff!
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Old 7th February 2012, 05:02 PM   #629
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the lundahl 100mh 3,4a is the LL2733
Looks way too small to me. I would expect a suitable iron-core to be a serious hunk of metal.
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Old 7th February 2012, 05:07 PM   #630
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.....

Tell NP not to post F5 Turbo and distract me.
do not worry 'bout that

go back in a day or two , for more waiting
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