[GreenKeys] Model 33 Q1 transistor replacement

[Erik Bruchez]

Wayne,

Thanks for pointing out the procedures. I had seen that page but not read
it thoroughly. So yes, my machine is currently "running open". The good
news is that I pretty much went through the steps mentioned, including
keeping the selector magnet closed manually. I do need to try the "pins 7
and 8" step in line mode.

Separately, I did try swapping Q1 between the two boards I have, and it
doesn't improve the situation. So both transistors might be good and the
issue might be somewhere else.

-Erik

On Tue, Jul 22, 2025 at 8:51 AM WAYNE via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> Hi all,
>
> Its normal for the big resistor to be "toasty".  Thats why the metal heat
> sync is over it.
>
> Been following you gents input on Q1 issue but had no input to share.
>
> I just hope you troubleshoot properly to get to the reason the machine is
> running open.  There is a procedure on the wiki site that Jeff Albrecht
> kindly set up for us.
>
> https://wiki.theretrowagon.com/wiki/Teletype_Model_33
>
> Also, every time we use a new vinyl hammer would should remember that Dave
> Tumey had those made at considerable cost to him.
>
> 73,
>
> Wayne
> KB1FDW
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