Millett "Starving Student" hybrid amp - Page 92

The builder is reading this thread an will contact you if that is doable - but she like many others are wary about accepting any money for the work, and would want approval of Pete Millett first. She did mine as a favor, and I sourced the case from my son's closet. My builder is also a student, so I am fortunate she found time to do this for me as well.

Outstanding build OldKing! I really dig the heatsink/tube configuration. Thanks for posting your BOM too.

Love the look of that car amp! I will hopefully be building a more modest version toward the end of the month.
A complete n00b at DIY amps, so see how it goes

headphoneaddict thanks. The builder already contacted me. Right now the builder has no time but said that if I needed some technical support they would help. Thanks again.

I have heard of people using chip amps to power guitar amps. I have an LM3875 kit and an extra 2 SSMH and 2 extra SOHA tubes that I haven't used and wondered if anyone here is clever enough to design a pre-amp schematic utilizing either of these tubes.

19j6 info:
19J6, Tube 19J6; Röhre 19J6 (19J6)

This might give you an ideas for the 12au7 tube.
DIY 12AU7 - IRF612 MOSFET Hybrid Headphone Amplifier
(also a cheap/simple build)

Speaker/guitar amps with different uses of the 12au7 (output and pre-amp)
http://ax84.com/index.php?pg=projects&project=firefly

http://www.harmonicappliances.com/de...ator2_8x14.pdf

tubes have arrived now to order up the rest of the parts

DIY 12AU7 - IRF612 MOSFET Hybrid Headphone Amplifier
(also a cheap/simple build)

I had wondered how this one would sound. I do have 2 extra tubes.


Speaker/guitar amps with different uses of the 12au7 (output and pre-amp)
AX84.com - The Cooperative Tube Guitar Amp Project

The problem with the firefly is that it needs 3 of those tubes and it is only 1/2 watt. It would break up to early for jazz style playing (trying to get into jazz now). I do like the idea of using a tube preamp to go with my chipamp to give some warmth. I think in the end though tube power is the way to go for guitar amps.

Hi m0b1liz3,
take AX84 Hi-Octane Tube Guitar Amplifier's schematic, it use 2 tubes (4 triodes) for preamp and is more universal for different distortion modes, than 1 tube preamp.
You can build whole amp (EL84 and small, not HI End output trafo is not expensive) or only preamp part. Connect chipamp to master volume pot output.

Yeah, I was thinking of building that amp but I am not sure about the fact that is based on a marshall. Marshall's are known more for their distorted sound whereas Fenders are known for their tube clean sounds. I am thinking of building a 5E3 style amp. Just trying to source out the parts. Since this is more for jazz, the AX84 may not be as well suited. If you have built one though and disagree, let me know!

Perhaps you guys could move this line of discussion to a new thread?

got most of my soldering done today. Just need to finish a few things before I go buy a chassis. A bit messy but I think it will be ok once I get it all organized into a chassis.

This is only my 2nd project (1st was just a desktop cmoy).

you'll find it is easier to solder point to point if you wait to do the soldering until after you have fixed parts like the tube sockets, pot, switches, etc to the chassis.

thanks for the tip, but I didn't have a chassis and was impatient

I still have to trim the pot shaft, but apart from that my second SS is finished. This time I went a bit overboard and used boutique parts: Elna Cerafine caps (I found them on Italian ebay pretty cheap), Obbligato caps, and a Blue Velvet pot. The case is a Hammond 1591D, plastic as it's easier to drill, and the finished amp is already pretty heavy anyway.

I planned a lot this build before receving all the parts, as the case is pretty small and the caps big, and I could have saved myself some time: the planned build had a problem (probably a blown Mosfet) and the way I fit everything together made the amp impossible to debug. So I desoldered everything, found an alternative layout, and when I finished reassembling I only got a loud buzz in both channels. I disassembled half of the components before noticing I had forgot to ground the pot...

A pretty instructive couple of days. At first listen and without burnin it sounds great, with more bass and clearer sound than my previous SS. Pics (click for larger images):