[Premium-Rx] DIODES FOR AGC LIMITING - E1800 RECEIVER

[Pat1McA at aol.com]

Greetings to All,
 
For some time I have been investigating the generally poor Agc  performance 
of the AEG E1800/3 Receiver.
 
This is the one specific area that lets this  otherwise superb receiver 
down.
 
One consideration is the use of diodes to limit large IF signal excursions  
to typically 6dB above the nominal  level. (more info see -  Communication 
Receivers Principles & Design. Rohde et al. McGraw-Hill)
 
The methodology was used in the R&S EK070, one of the  few receivers that 
really does have a truly excellent and pleasant Agc  action.
 
I am trying to find a source of High Conductance Diodes, either HP5082-1001 
 (1N4456) or HP5082-1006.
 
Does anyone know where these can be obtained please? 
 
They seem to be totally unobtainable, certainly here in  UK, rather like 
everything else now.
 
Please reply offline. Thanks.
 
Pat G3YFK