OPT-102 - data? (Audio Electronic Supply)

Cobra2 · 13th December 2007, 05:25 AM

Hi
I have a pair OP trafos; OPT-102, from Audio Electronic Supply ( http://www.audioelectronicsupply.com/ ) but they are no longer listed.
And my mails to them bounces...

Are they known? Good?

Arne K

dsavitsk · 13th December 2007, 05:32 AM

AES is owned by Cary Audio -- try calling or emailing them.

Cobra2 · 24th May 2009, 08:22 AM

Found these again, an did some measuring;

Primary : B+ to plate; 75+ohm (plate to plate:150+ohm)
Sec: ~0,4(-)+0,4(-) (8ohm tap less than 1 ohm)

Used my signal-generator to feed the sec.(8 ohm tap) with 5V (500hz), and measured 45V + 45V (90V) on primary.

Does this make the trafo 90/5= 18:1? -or 45/5=9:1?

Arne K

llwhtt · 24th May 2009, 03:26 PM

My AES catalog from 1994 lists the OPT-102 as a 25 Watt PP with a 6600 Ohm primary imp. However with your measurements I calculate that it is only 2592 Ohms! Primary volts divided by secondary volts, square that and then multiply by the secondary Ohms. 90/5=18, 18x18=324, 324x8=2592. If it is supposed to be 6600 Ohms, the voltage ratio should be approx. 28.7. Check your readings again.

Craig

Cobra2 · 27th May 2009, 02:47 PM

So I tried other way around: 233V in A-A, gives 12,8V out on 8 ohm tap. This gives the same ratio...

Arne K

13th December 2007, 05:32 AM	#2
dsavitsk diyAudio Member Join Date: Jan 2005 Location: Chicago	AES is owned by Cary Audio -- try calling or emailing them. __________________ http://www.ecpaudio.com :: http://diy.ecpaudio.com

27th May 2009, 02:47 PM	#5
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	So I tried other way around: 233V in A-A, gives 12,8V out on 8 ohm tap. This gives the same ratio... Arne K __________________ Ars longa, vita brevis

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24th May 2009, 03:26 PM	#4
llwhtt diyAudio Member Join Date: Jun 2008	My AES catalog from 1994 lists the OPT-102 as a 25 Watt PP with a 6600 Ohm primary imp. However with your measurements I calculate that it is only 2592 Ohms! Primary volts divided by secondary volts, square that and then multiply by the secondary Ohms. 90/5=18, 18x18=324, 324x8=2592. If it is supposed to be 6600 Ohms, the voltage ratio should be approx. 28.7. Check your readings again. Craig