Hello!
Thanks for your efforts to continue testing. Jonathan can be reached at:
audiotransformer@beeb.net
OR by phone:
+44 (0)1825 890111
It could be that the system in question (at the local dealers shop?) is much happier with a higher input level to the phono stage. Since the relative performace in the test was 20db to 26db to 33 db would indicate it may be a factor. If you have it installed at home as well please let us know what carts,loads, stages, etc it is wired to and what you have found. Since sometimes these things come down to system optimization (loading, gain, table vta, etc) it is likely most important to get it working best for you and not for your local dealer!
To check resistance of the wired tx103:
The primary hot to ground should read about 3.5 ohms at 1:10 or 1.2 ohms at 1:20
The secondary hot to ground should read about 140 ohms
These reading will vary depending on your meter and some meters do not like to read the high inductance of the transformer. My cheap meter reads them fine but my 'good' bench meter does not.....
Please let us know how you make out and we'll do our best to sort it all out.
Thanks!
John