Search found 5 matches

by jlsemrad
Sat Jan 30, 2010 2:29 am
Forum: Transformers
Topic: 5K 49% nickel SET outputs.
Replies: 6
Views: 11462

Is a somewhat larger core doable for a VT-52 SE? Are these C-core or EI?

Thanks,
John
by jlsemrad
Tue Dec 22, 2009 3:07 pm
Forum: Phono
Topic: SUT Selection
Replies: 20
Views: 114240

Dave, is there any advantage to loading the primary at the head shell?

John
by jlsemrad
Thu Dec 03, 2009 1:54 am
Forum: Phono
Topic: SUT Loading and Phase
Replies: 19
Views: 22759

Yes, the HA100X has a primary DC resistance of about 55 ohms. That seems like plenty for a low impedance cartridge like an Airtight or Haniwa.

John
by jlsemrad
Thu Nov 26, 2009 5:34 pm
Forum: Phono
Topic: SUT Loading and Phase
Replies: 19
Views: 22759

Dave, what is the nature of the effect of the primary DC resistance and inductance of an unloaded-secondary SUT? In other words what kind of load to the cartridge does the primary winding present?

TIA,
John
by jlsemrad
Thu Nov 19, 2009 5:32 pm
Forum: Transformers
Topic: Inverting Interstage Transformers.
Replies: 5
Views: 8207

Dave, How much grid current is there at the bias point you are using for the 211? It doesn't look like the positive bias point could be very high for 100ma of plate current. For true IIT operation don't you need to run a fairly significant amount of grid current to cancel the plate current of the dr...