[Heathkit] SB-100 TX audio gain question

[rbethman]

Sandy,

It makes me think their is an impedance mismatch between the Mic and the 
mic audio chain.

Try an old Rat Shack audio transformer.

If you don't have one, holler and I am sure that either one will turn 
up, or another impedance matching transformer will turn up or be offered.

Regards, Bob - N0DGN


On 12/27/2015 3:02 PM, Alexander N. Gerli wrote:
> Hi, Folks!
>
> My SB-100 is working fine, with one little exception: to have any TX audio
> out, I need to have the MIC/CW Level set virtually max. Checked the output
> waveform on my SB-610 scope, and it appears clean. The tubes in the mic
> audio chain are good, so I'm not certain what may be up. Seems as if the
> level should be optimal around 50% or a little greater, but not maxed out.
>
> Anyone have a suggestion where I might start looking?
>
> ​73,​
>
>
> ​Sandy AC1Y​
>
>
> Alexander N. Gerli, Sr.
> 548 Allred Mill Road
> Mount Airy, NC 27030-2202