• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

OPT-102 - data? (Audio Electronic Supply)

Cobra2

Member
Paid Member
2002-04-06 12:47 am
Stavanger, Norway
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
 

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Cobra2

Member
Paid Member
2002-04-06 12:47 am
Stavanger, Norway
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
 

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llwhtt

Member
2008-06-12 3:43 am
SoCal
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