[Johnson] BIAS plug for Thunderbolt amp

[manualman at juno.com]

The 4 pin plug is Amphenol 91MPM4L. A bit pricey today.
I believe the hole size is very close to the much common 4 pin microphone
jack that was found at places like Radio Shack and even at hamfests. The
4 pin jack and plug are cheap typically going for around $3 or $4 a
piece.

I think, but don't remember, that you can use the 5 pin, Amphenol
91MPM5L, but you have to cut off one pin.
These plugs were popular as mike plugs on some of the early tube CB rigs.
Lafayette used them. They were also used on several Kenwood auto stereo
speaker connections.

Pete, wa2cwa
www.manualman.com

On Tue, 15 Feb 2022 09:24:00 -0500 Steve Bookout <steve at nr4m.com> writes:
> Hello all,
> 
> I'm new to the group, but not new to ham radio, or boat anchors. 
> Have a 
> bunch of Johnson stuff, and just found this group.
> 
> Question for anyone.
> 
> I am looking for the small 4 pin plug on the back of the Thunderbolt 
> 
> that deals with the bias.
> 
> Does anyone have one that is excess to their needs?   Or, know 
> what's 
> it's called in the 'real world'?  Or, where I can purchase one?
> 
> I don't believe this reflector allows pics, or I would post one.
> 
> Any help would be appreciated.
> 
> 73 de Steve, NR4M
> 
> www.nr4m.com "The Goat Farm'
> 
> ______________________________________________________________
> Johnson mailing list
> Home: http://mailman.qth.net/mailman/listinfo/johnson
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Johnson at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html