Speedboost or other lps for Hagerman Trumpet MC

The Trumpet MC’s internal circuit with 555 chip is tasked with multiplying 15V DC into like 200V DC needed for the tubes. The idea is not to mess with that. The wall wart contains a cheap SMPS which converts 120V AC directly from the wall into that 15V DC. THIS is what an external LPS is going to replace. 

If you don’t like the idea of that 555 based voltage multiplier circuit, then you’d need to look for some older Trumpet versions, most of which were MM-only. Those had their own beefy linear PSU’s with four chokes.

I never did try an LPS. The noise floor you hear is pretty much dominated by hisss / shhhh from the JFETs - and it’s going to be there no matter how clean the PSU is. 

I finally found one of the VERY few Trumpet References Jim made, and it’s a thing of beauty. Great implementation of the Trumpet and Piccolo circuits; no compromises. The Trumpet MC is still really sweet for its price point. 

@mulvelimg, that is what I was getting at with my question.  With the jets and the 555 chip.  I couldn’t see how an external LPs could get around the internals in the unit.  The external LPS would end up in a switching circuit to get the rail voltage required.  
On another note, what have you found works best in the v2 position?  12ax7 tube.  I want to confirm what this position is for.  Looks like it handles phase correction.  But I am not very good a reading schematics.  Any suggestions?

@mulvelimg, that is what I was getting at with my question.  With the jets and the 555 chip.  I couldn’t see how an external LPs could get around the internals in the unit.  The external LPS would end up in a switching circuit to get the rail voltage required.  
On another note, what have you found works best in the v2 position?  12ax7 tube.  I want to confirm what this position is for.  Looks like it handles phase correction.  But I am not very good a reading schematics.  Any suggestions?

At least it’s not switching on wall AC anymore? :)

I’m not going to hazard a guess at the 12AX7 parts of the circuit; I’m a software engineer not hardware :) 

I’ve always liked more incisive / detailed tubes to balance the Trumpet’s inherent warmth. Telefunkens and Mazdas are great for the 12AX7 slots. I’ve run Mazda silver plates front row and Tele ribbed plates in 2nd row. That seemed to be best. Tele smooth plates it you want to slide a bit more back into warmth. 

Thanks,

I have tried several variations.  So far running Tele smooth plates in the v1, and a pair of Raytheon 7025 in the v2 (have another pair of Tele coming to try there.  And a pair of Valvo (Siemens made) E82cc triple mica in v3.  The Valvo replaced a pair of Mazda pinched waist Ecc83 and are an improvement.  You might want to try them if so inclined.  Thanks for the feedback.