I had an RC 411 receiver in which extra diodes been fitted between the two 
bases.. Without them the distortion was noticeable, but I don’t know whether it 
would be necessary to do this to prevent crossover distortion  in an RF 
amplifier.
 
John F5VLF

> On 23 Feb 2016, at 11:31, LineOne <[email protected]> wrote:
> 
> Apart from requiring a higher power supply voltage I find a complementary 
> pair (or pairs) of transistors to be satisfactory and, although the NPN and 
> PNP sets should be reasonably matched to each other, the match between NPN 
> and PNP is not critical.  You don't need driver transformers and start with a 
> nice, low output impedance.
> 
> Hugh, M0DSZ
> 
> 
> 

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Researching history of RABSON, BLACKSHAW, GAUNTLETT, VERLANDER and ROBSONNE