02-09-2013, 05:34 PM
TF1331 EHT power unit. posting 4/3/013, #16. The circuit you have posted is the same as used in the TF1330 single beam model of 1960. The TF1331 EHT oscillator in my manual is clearly a later version, dated 1964, with a pda doubler, and some Lucas semiconductor rectifiers- DD0058 (800v,500ma). I assume you have both circuits available. The tube in the TF1331, SE5H was an improved version, effectively identical, to the SE5A used in the TF1330. wme_bill m0wpn
