[Johnson] 4-prong bias plug for Thunderbolt

[Peter Markavage]

You might also want to check with this guy:
http://www.kenselectronics.com/lists/micplug.htm

Another thought would be to get the 4 pin matching chassis jack and plug
microphone assemblies that were used on the early Kenwood rigs. The hole
assemblies should be pretty close. Also, with a slight enlarging of the
hole, the 4 pin Amphenol assemblies (similar to the 2 pin used on Heath
and some Johnson rigs) would also work.

Pete, wa2cwa
 
On Sat, 11 Feb 2006 16:55:23 -0800 (PST) Glen Zook <gzook at yahoo.com>
writes:
> The pin layout on the old Motorola and General
> Electric two-way radio microphones are the same pin
> spacing.  However, the insulator around the pins is
> usually too large in diameter to fit inside the metal
> ring on the Thunderbolt jack.
> 
> I have taken the insert and VERY carefully turned them
> down using a grinding wheel.  It is a pain in the
> posterior to do this but when nothing else is readily
> available one does what one has to do.
> 
> Glen, K9STH
> 
> --- Stephen Victor <victorsj at yahoo.com> wrote:
> 
> Does anyone know how I can obtain a plug that fits the
> bias socket on the back of the Thunderbolt?  I thought
> I had one but the prongs are too wide.
> 
> Glen, K9STH