I'm not sure of the specifics of the oven's heater element. Tim's done a lot more work on the 2005 models. You can message him by going to his post and clicking on the speech bubble icon below his username on the left side of the post. The tooltip for it is "Personal Message". You can include a link to your post, which is as follows: https://www.eevblog.com/forum/buysellwanted/fs-power-designs-parts/msg1241819/#msg1241819
Thanks for the pointers. Sent a msg to timb; waiting for his response.
Dave M
I sent you a detailed reply a few days back. Let me know if you got it!
I also wanted to point out o everyone else following the thread that I will be (finally) offering my custom thermostat replacement kits to the forum soon. I've had two of them being tested in real 2005 and 2005As for several months and both seem to be working perfectly. They hold the oven temperature within 0.5c of the set point, compared to the original mechanical thermostat which had a 5c variance.
My solution doesn't require you to remove the original thermostat (which is a massive job) but does require a small hole to be drilled in the top of the outer oven casing, to feed a small bead thermistor into. The temperature control circuit is analog (no MCU or clock to inject noise into the PS output) and uses a PZV (Proportional Zero Voltage) control method. The heater itself is controlled by a small SSR. Control of the SSR is, essentially, PWM with a looong period (10 seconds in this case).
There are also provisions for an extra board to be installed onto the heater control PCB which will provide an output for an RGB led to indicate oven temperature (blue when near ambient, moving to red when >10c over set point). This LED could replace the existing oven lamp on the 2005/A.
The heater control PCB will also let you select whether you want to oven to run 24/7 or only when the PS is on (the latter option requires you to run a wire from the main power switch to the board).
Hopefully I'll have these available for sale by the end of July or early August.