Home |
Search |
Today's Posts |
#1
Posted to rec.audio.tubes
|
|||
|
|||
FA: UTC HA-107 AUDIO INTERSTAGE TRANSFORMER (Fully-Tested)
FA: UTC HA-107 AUDIO INTERSTAGE TRANSFORMER (Fully-Tested)
http://www.ebay.com/itm/230761522533...9#ht_500wt_965 Replacing Lundahl interstage transformer with UTC HA-107 was a big improvement. Permalloy cores are inherently more linear than silicon steel. They may be not the best choice for output transformer due to saturation issue, but for interstage use they are unbeatable. HA-107: 15+15 K primaries 45+45 K secondaries 20-20,000 Hz 3 dB Pmax 200 mW No unbalanced DC Weight about 4 lb The core in these transformers is supermalloy (or hypermalloy, as UTC called it). It is 80% Ni alloy annealed in hydrogen atmosphere to achieve the highest mu (about 20,000 compared to 10,000 of 45% Ni permalloy and 5,000 of silicon steel). High permeability allows achieving the same inductance with fewer turns, thus decreasing stray inductance and winding capacitance. HA-107 has two layers of shielding, external mu metal and internal copper. Separate windings allow independent biasing of output tubes. - |
Reply |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
sunaudio sv-2a3pe interstage transformer | Vacuum Tubes | |||
interstage transformer | Vacuum Tubes | |||
(3) NICE 8-track players-fully serviced & tested-all working | General | |||
(3) NICE 8-track players-fully serviced & tested-all working | Tech | |||
(3) NICE 8-track players-fully serviced & tested-all working | Pro Audio |