Guten Tag
These may help.
I dont know if the trimpot is in the preamp or pwoeramp, but if it is a DC offset or bias adjustment pot, the values shoudl be similar between different amp models.
I believe the WT405 is different.
It actually has a "Warm" trimpot.
Having never encountered one I had to Google it.
Get this.
There is a small hole in the front panel that allows you to access the "Warm" trimpot, with a screwdriver.
(just the thing you want to give a guitar player
My take is that it was a crappy trimpot (by definition it is not utilized a lot) that just got abused & broke.
I believe the WT405 is different.
It actually has a "Warm" trimpot.
Having never encountered one I had to Google it.
Get this.
There is a small hole in the front panel that allows you to access the "Warm" trimpot, with a screwdriver.
(just the thing you want to give a guitar player
My take is that it was a crappy trimpot (by definition it is not utilized a lot) that just got abused & broke.
Here the needed schematic is attached.
Models WT330, WT390 and WT405 are schematically identical,
excluding different power transformers.
The “warm trim” potentiometer is TR2 (10K) on page 2 named "OD Trim".
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