how to measure unknown transformers?

[mfdu]

ok. here's what is probably a simple question.

i have a lovely grab-bag of audio trannies (input and output) but i need to know how to figure out their specs.

how do i figure out if a trannie is an input or and output trannie? and how do i figure out what it does? (ie. 600ohm > 10kohm? or 1:2? 1:6.45?)

obviously i ain't looking at determining THD or frequency response - just the actual windings on the iron!

i did try measuring them - resistance of one side, then the other. i also tried that with an OEP 3E (1+1:6.45+6.45) - the results were inconclusive . . . or i didn't know how to translate the results!

i await advice

chris
(mfdu)

 

[Guest]

Do you have a functional generator and oscilloscope?

 

[mfdu]

i can produce tone through protools or as slate off the console, and i can grab a software oscilloscope - don't have access to a hardware scope.

i was kind'a thinking i should surely be able to use a DMM to measure . . .

chris
mfdu

 

[Ptownkid]

http://www.groupdiy.com/index.php?topic=6571&highlight=web+info

Couldn't find it in a search, but then i remembered I have a print copy with the URL at the top, sweeeet.

Hopefully that helps.

 

[mfdu]

hey thanks for that - much appreciated!!!!!!!!

chris.

 

[spacecho]

Hi Chris,

So how many trannny do you have now?

at last count i have like 26 of em sitting here not including the marinair order..... phew...

i ended up with a stack of extras from rick too!

good to see you are figuring out what to do with em.

p.s - i'm hooking up some custom cases from purusha in the near future (dual1176 with cutout for ricks sifams) ill let you know how it goes!

later mate

 

[mfdu]

hi spacecho

yeah, these are from rick. damn him and his black heart!

i've got the la2a awaiting a source for t4b's. but i've got trannies for them.

i've got input and otputtrannies for a pair of baby animals, but have yet to order partly because i need to figure out what input trannies i'm using so we can figure out the variable impedance.

going to order some more boards from gustav, too - just to keep me busy.

and i decided it was time for a refresher on guitar, so i grabbed a red SG.

idle hands make the devils work.

chris.