possible problem with ampex351 input transformer - any help?

[dramadisease]

so i need a solid way to test this transformer, as my unit (after being rebuilt) seems to work quite well except in balanced modes - i have the original input transformer (gold pins - pre-peerless pre-utc - dunno who makes it) and original output trannies. i love this pre but this has been a big bummer since i got it rebuilt. can i test dcresistance or will it ruin the transformer? what should i do if primary or secondary is open?
thanks!
-bryan sours

 

[bluebird]

you can test DC resistance. it won't hurt your transformer, as long as you have a modern VOM.

if there is a short CJ will fix it for free!!! :razz:

 

[CJ]

do you have the pinout?
you could look at how the socket is wired to determine in vs out pins.
then just ohm it with a standard DMM.
I measured the current and voltage coming out of a lot of diff meters and found only the Simpson analog and Fluke bench meters to be of conceaern, though unproven.
send it here!
:grin:

 

[neilium]

ischematic of front end is here, if that's any help:

http://ftp.ampex.com/ampex/manuals/audio/351man/30960.schem.pdf

 

[dramadisease]

tested the tranny and it was fine, found some heater problems in the first stage of the preamp - worst interconnect system ever. usually i replace it, but i was lazy... just goes to show!
thanks
-bryan