Hi all,
I have an SCA-35 which I got about a year ago, but ever postoned the project of starting restoration until a couple of weeks ago.
At this point I don't even remember what was claimed to be working - I got this off of ebay - but I started assessing the state of various things in the order of importance or criticality in the functionning of the component.
After making sure the PS supply is in good shape (I'm using an SDS labs board), I took off all of the OTs connections, and measure their sections in DC, comparing from left to right for relevance.
They all match, except for one section - BLU/GRN measures about 125ohm DCR on one channel while the other is at about 280ohm...
I can think of two types of issues with transformers - open winding (DCR is infinite, so not this case), and shorted windings (and then DCR would differ like I'm observing, as they can short out across sections etc., though not likely).
What do you guys think? Do I have one bad output transformer? I am not sure what else would be recommended to rule out any problems on the OTs. I could use an impedance meter I have (C use), just to jump up testing one step from DCR to a more real world test.
I'd be very upset to discover that an OT is bad - these are the cloth early type. Not sure of Q differences, but I prefer them. But heck - gotta figure out what's going on.
Many thanks for all thoughts and suggestions!
aR