On Sat, 21 Jun 2008 12:13:54 +0100, "N_Cook"
wrote:

legg wrote in message
.. .


Other RCA, like RCA29 and RCA30 with suffix letters
are like TI and A = 1.5 times basic non-suffix Vcb max
B = x2
C= x2.5

I cannot believe a 1C03 - C is 2.5 x 120V = 300 volt rating
in a circuit with rails + and -33 volt

The letter suffixes of TIPxx devices signify voltage groups,
increasing by 20V VCEO in each range, not a multiplier of a base
voltage rating. The RCAxx corresponding devices follow the same TIPxx
convention, to directly substitute for the TIP parts.

RCA1Axx, RCA1Bxx and RCA1Cxx devices, if given a dash suffix, are more
likely being graded for HFE, as voltage grading is already signified
by the xx part of the device ident. The gain group may be important in
matching quiescent bias loss of paralleled output drivers.

Grading parts for VCBO is pointless when dealing with linear audio
devices, as VCEO or VCES, SOArea and Rthjc will determine their
ruggedness in non-switching circuits driving reactive loads or single
faults. VCEO is always equal to, or less than VCBO.

The RCA house number data sheets refer to JEDEC part numbers for
device curves and test conditions.

RL