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Show us your flea-watts amps!
- Thread starter davidro
- Start date
dallen9494
Member
Thanks Lavane!Very nice layout.I have a small spud amp under construction. One tube that can be used puts out 1.2 watts. I'm going for the big 5.5 watt version. That's the nicest DG-1 I've seen yet. Congrats!
Darrell Keim
Member
triode17
Super Member
Old posting answer I know, but this is a really clever design! the designer had to choose tubes with the same heater current series rating, yet have enough flexibility to work as a power amp with drivers.
One question though, if it runs from +/- 96v, don't you need four +48v SMPS's?
Lavane
Lunatic Member
Very nice! Unlike the chassis plate. I built one of these. I've been very happy with it. What did you bias your output tubes at?
moggi1964
Active Member
Running them at 65mA with a B+ at about 380V if I recall. It is whisper quiet even through my 96dB bookshelves but add a source and it drives my less efficient Genesis II+ (88.5dB efficiency) really well.
Lavane
Lunatic Member
That's what everyone says, me included. They are very quiet. I have mine biased at 60ma. Other than mine, yours is the only other one with a base that tall that I've seen. Nice looking amp!
moggi1964
Active Member
Thanks.
I run a fan underneath, it's designed for cooling PS4's I think but it sits on rubber feet and runs so quietly I need to put my ear to the base of the amp to see if it is on. The airflow helps keep the whole thing cool as they do have a tendency to run hot especially the mosfets.
BinaryMike
Pelagic EE
My original intention was to use a conventional power supply circuit for the low-current -96V rail. I never did build that amp design into a chassis, so I don't have a final power supply circuit design to show. The breadboard was always operated from benchtop PSUs.
Lavane
Lunatic Member
That's one of the reasons I built the base so deep. I also have vents on the sides near the top. I used a huge TO-220 heatsink for the double regulator mounting it to the top plate off the board. My Avatar is the one I built. Yours is the nicest I've seen yet. The wooden knobs are a nice touch.
Thefamous
Active Member
Modified chi-fi SEP. Sounds great and dead quiet. Replaced some of the cheaper components and some that seemed out of spec, but just the chassis, xformers and two psvane el34s were worth the money. Probably 8wpc so maybe not quite flea.
Plus the Bluetooth module was a nice bonus.
Plus the Bluetooth module was a nice bonus.
Lavane
Lunatic Member
I guess this would pass as a flea watt amp. It's a headphone amp with driver and output tubes complete with output transformers. The impedance is selectable from 16 ohm to 600 ohm. It puts out 1.2 watts into 16 ohms.
If I had some 16 ohm speakers I would hook them up at see how it sounds.
If I had some 16 ohm speakers I would hook them up at see how it sounds.
moggi1964
Active Member
Friend of mine made the box and the knobs from walnut. He also made the plinth for the TT from plyboo; he cursed me for weeks after
That stuff is tough to work!! Apparently 
.
Lavane
Lunatic Member
Yup. I've built a lot of custom home installed book shelves and wall units using Oak and some walnut. They are hard woods. I've dulled a few saw and planer blades. My favorite is having to drill holes for finishing nails.Friend of mine made the box and the knobs from walnut. He also made the plinth for the TT from plyboo; he cursed me for weeks after
I wimped out and used Maple.
Thanks to @opnly bafld , I own this beaut, a Dennis Had INSPIRE Universal SET amp:
Tried it with various tubes, and from what I currently have available in conjunction with what I'm powering (some modded Altec 9844's), I seem to have settled on the original Gold Lion KT88's plus a Tung-Sol 6SU7GTY and a Mullard 5AR4. I do need to try the 6F6's pictured above again, when I can get a preamp hooked up to give me more input voltage. Next purchase will be some KT150's, though, which max the amp out at about 8Wpc.
Tried it with various tubes, and from what I currently have available in conjunction with what I'm powering (some modded Altec 9844's), I seem to have settled on the original Gold Lion KT88's plus a Tung-Sol 6SU7GTY and a Mullard 5AR4. I do need to try the 6F6's pictured above again, when I can get a preamp hooked up to give me more input voltage. Next purchase will be some KT150's, though, which max the amp out at about 8Wpc.
Redboy
a few good watts
Ooh, very nice!! I've always been intrigued by that one and would like to hear it someday. SE EL84 is a magical thing!
I'm working on a pair of SEUL EL84 monoblocks now, but progress has been... slow.
