[ARC5] R113

[Mike Hanz]

That was an developmental tube produced for ARC evaluation, Chris.  I 
know of no direct substitute though I *did* do some looking for 
operational use in my own R-112 and R-113 (it would worry me to wear out 
a tube that likely only still exists in the several dozens today.)  I 
can send you a drawing if you wish to manufacture your own.  :-)

The conclusion I finally reached was to replace it with a 12A6, tacking 
in a couple of solid state replacements for the detector diodes (1N34's 
seem to work fine for this and are contemporary enough to keep the radio 
from getting hives from the non-toob substitute).  Part of the rationale 
for this decision was the choice by ARC to stick with the 12A6 for their 
almost identical next generation of the R-113, the R-19 in the ARC Type 
12 series.  Though not built with the impressive quality of the VHF 
prototypes, the R-19 has many design elements in common with them.

Best 73,
Mike

Chris Gill wrote:
 > G'Day All from across the pond, Gordon White has been kind enough to
 > organise for me a TM for the above Rx, but suggested I seek help from
 > the collective wisdom of the list on the following tube. Does anyone
 > know of an equivalent for the A 5023 used in this Rx as the Detector
 > 2nd AF or suggest a close substitute. Cheers, Chris. VK4YCG.