[Drake] T4XC Won't operate PTT

[Garey Barrell]

Scott -

Is the GAIN control pushed in??

73, Garey - K4OAH
Glen Allen, VA

Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>


Ka9p at aol.com wrote:
> On the off chance I'm making a silly mistake I thought I'd check and see if
>   there is a reason for not being able to make a T4XC operate PTT when it
> will  operate VOX.
>
> I've switched out the 6EV7 and the 12AX7's just in case that might be the
> cause.  Other than that there are no clues except for a note in the manual
> that an 18k resistor was removed in the mic circuit.
>
> Curious if that resistor was an impedance-related mod or could be messing
> up the PTT, and hoping for good ideas as to what to check next.
>
> Thanks, Scott ka9p
>
>