Testing other transistors on Pleiades 2N3055 one transistor power amplifier

This is the schematic used:
https://euroelectron.blogspot.com/2019/05/pleiades-one-transistor-emitter.html


BD243 was tried
2N2218 was tried
RCA 2N3053 was tied too


Signal path, setup:


(Ray of Light - Madonna, CD) - Sony CD Walkman, line out mono bridged - Pleiades one transistor power amplifier - 4Ω linoleum Pleiades Auratone 5C type speaker with 4Ω Tesla 5in TVM ARX-130-20/4 drive unit - small reverberant room


They sound nice but 2N3055 is more sensitive for given CD Walkman line out
2N3055 sounds great even at <500mA collector current.


Looking at the RCA datasheet for 2N3055 the gain bandwidth product at 1MHz is max (1.6MHz) at 100mA collector current. At 500mA it is 1.3MHz.


Later addition:
The BD139 was tried after a few days. Wow! See future post:
https://euroelectron.blogspot.com/2019/05/auditioning-bd139-transistor-on.html


Reference:


RCA Solid State DATABOOK Series
SSD-204A
Power Transistors
Selection Guide
Data
Application Notes
1973