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Old 29th August 2007, 08:04 AM   #1
tyor is offline tyor  Norway
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Default pri. impedance vs. sek. impedance

I wonder if i use a 8ohm speaker on the 4ohm tapping of a OPT that have 2.5k pri. wil that give me 5k pri impedance?
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Old 29th August 2007, 08:17 AM   #2
jane is offline jane  Norway
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Yes.
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Old 29th August 2007, 08:17 AM   #3
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yes, it will.
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Old 29th August 2007, 08:42 AM   #4
tyor is offline tyor  Norway
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thanks.
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Old 29th August 2007, 09:59 AM   #5
Empee is offline Empee  Netherlands
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Default PP opt as SE opt ?

Hi!

Can a PP opt be used as a SE opt ?

if so, use one-side-to-centretap or use the whole primairy ?

I got a PP opt Ra-a of 1K7, how much would one side be ?


cheers,

Empee
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Old 29th August 2007, 10:07 AM   #6
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Hi Empee,

yes, but without DC in the primary. Use both sides of the primary connected in series.

Regards Andreas

P.S. using only one side you'll get 1/4 of the inductance
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Old 29th August 2007, 10:21 AM   #7
Empee is offline Empee  Netherlands
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how do you mean that, without DC in the primairy ?



and just to be sure:

In series, so leave the centretap unconnected.

Primairy remains 1K7.

If 8 ohm speaker used on 3 ohm tap primairy acts as 5.1K

EL34SE ?
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Old 29th August 2007, 10:52 AM   #8
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Quote:
Originally posted by Empee
how do you mean that, without DC in the primairy ?
A choke betwen the plate of the output tube and Ub+ and a blocking condenser betwen the plate and the output transformer primary, the second connection of the primary to earth.

Quote:
Originally posted by Empee Primairy remains 1K7.

If 8 ohm speaker used on 3 ohm tap primairy acts as 5.1K

EL34SE ? [/B]
only in the mid-frequencies; for lower frequencies the primary inductance is important.

Regards Andreas
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