[ARC5] More on Bashless T-17 Microphone Resurrection

[Mike Feher]

The old style rheostats for the AC line were made like a long ceramic
cylinder with a knob on one end. Most of these were maybe about 1.25" in
diameter and about 4 inches long not counting the knob. There really were
many versions, from smaller to larger. Regardless, as I recall, these were
filled with carbon granules which were compressed as the knob was turned
clockwise and hence the resistance decreased, and of course the opposite the
other way. One of these would yield enough granules for a hundred T-17s or
similar. 73 - Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell, NJ, 07731

732-886-5960 

 

From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of DSP3
Sent: Wednesday, June 22, 2016 10:49 AM
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] More on Bashless T-17 Microphone Resurrection

 

The toner material is carbon-based, to be sure, but is far, far smaller
particulate, not granules as would be in a single-button carbon mic element.
Its more like a graphite substance. I really don't think one could
reasonable handle the material? 

 

Jeep - K3HVG

 

On 6/22/2016 8:17 AM, Mike Everette via ARC5 wrote:

This is an old thread to be sure; but I have a question.

 

What is the material used in black computer printer cartridges?  If it's
carbon, what about refilling a mic element using one of the DIY cartridge
kits?

 

73

 

Mike

 

WA4DLF

 

 

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