2. amps-preamps
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Is anyone familiar with the process to bias the TRL Dude Preamp

I was saddened to learn that Paul Weitzel has passed away earlier this year. I was wondering as I was in the process of replacing tubes in my TRL Dude, it appears there is a potentiometer for what may be biasing
of one of the tubes. Is anyone familiar with this process and can share it here? I am not sure which tube
gets biased either, but it would appear to be one of the three power supply tubes. Thanks in advance.
tellefsen

Showing 3 responses by grannyring

grannyring's avatar
grannyring
6,602 posts
 
Hi tellefsen. Contact me thru this Agon system and I can help you. Your high voltage power supply caps should be set to a particular voltage depending on the version of your Dude. The latest generation with the 1 Inch thick faceplate should have 325-335 Vdc on those power supply caps. The pot you are referring to allows you to adjust the Vdc to hit that range. 

I need to know the particular Dude you have to be sure of this setting. Changing your tubes should not throw the voltage out of range I'm most instances. 

Thanks

Bill
grannyring's avatar
grannyring
6,602 posts
 
We have not heard from the poster? Please let us know if you are all set as we are interested! 

grannyring's avatar
grannyring
6,602 posts
 
Great . 335 Vdc is your target. Nice preamp!
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