At 05:24 PM 4/28/2018, Renée wrote:
I believe the replacement is MPF102, pin for pin. less filament of course.
On 2018-04-27 08:46 PM, Dale H. Cook wrote:
Tek replaced the front-end, sweep generator, and trigger generator Nuvistors (all 8393) with FETs in the 453 beginning with serial 20,000.
The Tek parts in the serial 20,000+ 453s were N-channel JFETS, a dual FET, Tek part 151-1011-00 in the front ends, and individual FETs, Tek part 151-1005-00 in the sweep and trigger generators. The former crosses to a dual 2N3822 and the latter to a 2N4303. Both show as "FET Tek Spec" in the manual and were likely selected so the channels would match.
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
Dale H. Cook