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Old 30th March 2006, 04:49 AM   #21
Magura is offline Magura  Denmark
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Default Re: Just the man I want to see!

Quote:
Originally posted by carpenter
I'll explore air-core inductors. I can have them wound with a center tap.

Is there optimum size in wire gauge and in mH? My wire guy doesn't wind below 14 gauge. 16 is more cost effective...


Many thanks,

John Inlow

I made my inductors of 1.9mm wire. 1.9mm is the point where it turns too troublesome to work with VS. low resistance.

For 2*80mH you end up with a 20kg inductor, so you will need a couple of rolls of magnet wire

Magura
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Old 30th March 2006, 05:06 AM   #22
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Default 20 kilograms!!!!!!!!!!!!!!!!




I think I'll stick with my nice little 1000V/A Plitrons. Good grief, I'd need a wheelbarrow and a handtruck just to move the thing around.

God, I love you crazy guys!
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Old 3rd April 2006, 12:05 AM   #23
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Default ZV7-T coupled to a line array...

Can anyone tell me what it would take to coax this amplifier into handling a very low speaker impedance?

I'm considering the fabrication of a large line array--say 16 speakers per side. I'd like to keep these wired in parallel if possible.

Any thoughts?

John Inlow
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Old 3rd April 2006, 12:12 AM   #24
Zen Mod is offline Zen Mod  Serbia
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Default Re: ZV7-T coupled to a line array...

Quote:
Originally posted by carpenter
Can anyone tell me what it would take to coax this amplifier into handling a very low speaker impedance?

I'm considering the fabrication of a large line array--say 16 speakers per side. I'd like to keep these wired in parallel if possible.

Any thoughts?

John Inlow
just increase Iq to insane level
use several cascodes in parallel-'till xformer became too hot
then use bigger xformer

or buy bigger amplifier

or ,even better, buy bigger speakers with sane impedance


hehe-best of best - change hobby

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Old 3rd April 2006, 01:34 AM   #25
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Default Choky, you put the smart in aleck...

I was thinking more along the lines of using those unused outputs of the current transformer as an impedance matching device.

I just wondered if the transformer can act as a step down transmission to drive insanely low speaker impedances.


John
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Old 3rd April 2006, 01:46 AM   #26
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Default Re: Choky, you put the smart in aleck...

Quote:
Originally posted by carpenter
I was thinking more along the lines of using those unused outputs of the current transformer as an impedance matching device.

I just wondered if the transformer can act as a step down transmission to drive insanely low speaker impedances.


John

"Choky, you put the smart in aleck...."
I didn't get it....

anyway-you're right about "unused outputs"....in fact-old scheme known to me from one sort of push-pull tube amplifiers where output xformer was connected between cathodes......

I just didn't know that you have unused taps on xformer...

and ratios are (OK-voltages are?) ?
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Old 3rd April 2006, 01:57 AM   #27
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Default don't know enough about transformers... bummer

The current supply transformer is Plitron's 1000V/A with 120/120 primaries with 50/50 volt secondaries. I'm guessing that this is a little more than a two to one step down.

wouldn't this double the current while halving the voltage?

John
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Old 3rd April 2006, 02:30 AM   #28
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Default Re: don't know enough about transformers... bummer

Quote:
Originally posted by carpenter
The current supply transformer is Plitron's 1000V/A with 120/120 primaries with 50/50 volt secondaries. I'm guessing that this is a little more than a two to one step down.

wouldn't this double the current while halving the voltage?

John

from top of my head-if you use 120+120 for 8 ohms ,then 50+50 is for 1,83 ohms
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Old 3rd April 2006, 02:39 AM   #29
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Default the schematic at the beginning of this thread...

It shows how the speakers are currently driven. What the schematic doesn't show is the unused 50/50 volt secondaries on the other side of the 120/120 volt coils. Does this change your feelings on the secondaries driving a 1.83 ohm load? Also, would the secondaries be series or parallel?

Thanks for taking the time to chat,

John Inlow
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Old 3rd April 2006, 02:41 AM   #30
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Default Re: the schematic at the beginning of this thread...

Quote:
Originally posted by carpenter
It shows how the speakers are currently driven. What the schematic doesn't show is the unused 50/50 volt secondaries on the other side of the 120/120 volt coils. Does this change your feelings on the secondaries driving a 1.83 ohm load? Also, would the secondaries be series or parallel?

Thanks for taking the time to chat,

John Inlow

do not change or touch anything;
just connect these damn 2 ohm spks to 50-50 taps
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