2. amps-preamps
  3. 194065-38016

Speedboost or other lps for Hagerman Trumpet MC

I have been really enjoying this unit so far and now have Tele ac7 smooth plates (curve trace matched low noise and non-microphonic, thanks Brent Jessee) and a fantastic pair of Valvo e82cc triple mica in the au7 sockets.  I think I have the tune combo I want.  
I have read about folks using lps for this phono stage and I am a little confused as to how it could make sense since the power supply in the Trumpet MC is a switching one.  Can anyone explain how lps would affect the onboard power supply or would one need to somehow bypass it, and if so how would you do that without rebuilding the unit?

lastly I saw @lewm  recommend 12fq7 as a substitute for 12au7.  Looking at the data sheets, they are similar with identical on out, but not identical.  Has anyone tried this and if so what was the result?  Sheesh, guess I am not done tube rolling after all.

thanks 

oceanica

Showing 2 responses by gkelly

gkelly's avatar
gkelly
331 posts
 

Inside the wall wart contains the SMPS. You would replace the wall wart and then use a LPS. In both situations, the power supply is outside of the unit itself. So you’re basically just replacing one for the other. On a sidenote, very often, a LPS will make a difference for the better. Make sure you get the correct voltage LPS to avoid frying little wires. 
https://www.sbooster.com/audio-upgrade-linear-power-supply

this was mentioned on the Hagerman site on their first customer review…

hope this point you in the right direction

gkelly's avatar
gkelly
331 posts
 

Because you’re replacing the switch mode power supply wall wart with a toroidal power supply that has been shown to enhance the quality of sound. Don’t know what’s going on on the inside of your box. At this point, I would call upscale audio and ask them to give you a more detailed explanation.

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