Gaz wrote:Using bigger iron with the wrong primary impedance and switching taps to compensate will reduce bandwidth. I'd love to tell you it's not noticeable, but it is!
Can you talk more about that? That's the complete opposite of what I was told about transformers. (i.e., they don't have primary or secondary impedances, but instead only a turns ratio).
I've run a twin reverb with a pair of tubes pulled running 8ohms on the secondary and haven't noticed a reduction in bandwidth but I haven't been measuring with a spectrum analyzer.
xtian wrote:I recently had to do this. I put 0.5R resistance in series with EACH leg of the heater winding, and got exactly 1vac reduction (from 7.3 to 6.3vac). This was in my Eico 377 build...only two tubes in that thing.
Xtian: I think this sounds like a good option. So you had the main heater wires going to a .5ohm resistor then to the tube?