My Boozhound amp. It's a cigar box chassis and the power transformer gets hot as a...uhhh...underpowered-transformer-in-an-amp-drawing-way-more-current-than-it's-meant-to-deliver. It's a first attempt in tubes and I still need a pair of speakers to match it with. I'm planning a pair of Buschorns with the 4.5"MTM drivers ($11ea) how do you go wrong?
http://i125.photobucket.com/albums/p70/dinui/IMG_2339.jpg
http://i125.photobucket.com/albums/p70/dinui/IMG_2352.jpg
http://i125.photobucket.com/albums/p70/dinui/IMG_2339.jpg
http://i125.photobucket.com/albums/p70/dinui/IMG_2352.jpg
Hi all!
Here is my Preamp with Tango NP126 and 6SN7 RCA.
http://i202.photobucket.com/albums/aa22/Audio-Late/Pre6SN7_Late-03.jpg
http://i202.photobucket.com/albums/aa22/Audio-Late/Pre6SN7_Late-02.jpg
Here is my Preamp with Tango NP126 and 6SN7 RCA.
http://i202.photobucket.com/albums/aa22/Audio-Late/Pre6SN7_Late-03.jpg
http://i202.photobucket.com/albums/aa22/Audio-Late/Pre6SN7_Late-02.jpg
my little preamp in new clothes. after the device keep it simple
http://i212.photobucket.com/albums/cc284/wuffer28/DSC01097.jpg
http://i212.photobucket.com/albums/cc284/wuffer28/DSC01098.jpg
http://i212.photobucket.com/albums/cc284/wuffer28/DSC01097.jpg
http://i212.photobucket.com/albums/cc284/wuffer28/DSC01098.jpg
Hello! Bas horneman,
My preamp like Mr.Andersen's schematic . He shows that schematic in this topic: http://www.diyaudio.com/forums/showthread.php?s=&threadid=99304&perpage=25&pagenumber=2
Power transformer made in USA (which was used in army).
Thanks Andersen very much too.
My preamp like Mr.Andersen's schematic . He shows that schematic in this topic: http://www.diyaudio.com/forums/showthread.php?s=&threadid=99304&perpage=25&pagenumber=2
Power transformer made in USA (which was used in army).
Thanks Andersen very much too.
Uploaded som outdoor shots of my projects to my site:
OUTDOOR HIFI - FOTO PHANTASTIKA
Click the images to get further.
OUTDOOR HIFI - FOTO PHANTASTIKA
Click the images to get further.
I was browsing this incredible gallery again and thought I might add one of my own that I am not terribly embarrassed about. It is a headphone amp and the psu is not pictured as it is pig ugly but does the job well hidden from view. 
The detail of the design is available hereCavalli Audio
seem to be having attaching an image??
The detail of the design is available hereCavalli Audio
seem to be having attaching an image??
An externally hosted image should be here but it was not working when we last tested it.
Salvaged the tubes, sockets, power supply cap, transformers, panel meters, and some of the resistors from an old tape deck that was given to me. Salvaged the chassis and power cord from an Intel Inbusiness Storage Station (an old NAS device). Had a scrap of Bocote wood leftover from a jewelery box I made. I had to buy new resistors and caps for the amplifier stages, switches for the front panel, a Volume pot, and 1/8" stereo phone socket for the input. Anybody else got any old equipment they don't want?FastEddy said:" ... with almost all salvage parts. ..."
!!
Unity coupled output amplifier (ala McIntosh) with 2 pairs of EL86 as finales.
One of two mono blocks:
Working conditions are 260V B+, 190V Bg2 (regulated) and –90V for the negative rail. The amp runs near to class B, biased with 4 x 10-20mA in the output stage.
Max power output was estimated to be about 30W and I measure the onset of clipping at ~15Vrms into 8.2R (~28W)
Schematic: front end and output stage:
The output transformer is a custom transformer (3x720R) from Sowter UK. Global negative feedback is kept low, about 10dB, but there are no problems to apply more feedback to get even better technical results. Personally I am not a big supporter of global NFB, but used in proper amounts it does good things.
With 10dB NFB I achieved these results:
Zo : 0.8 ohm
THD: ~0.6% (50Hz, 1kHz, 10kHz, @ 25W Po) (2nd and 3rd harmonic dominant)
Frequency response: 10Hz-100kHz (+0/-0.5dB). –3dB at 230kHz.
30kHz square wave response (4V pp) is not that bad:
Jan E Veiset
One of two mono blocks:
An externally hosted image should be here but it was not working when we last tested it.
Working conditions are 260V B+, 190V Bg2 (regulated) and –90V for the negative rail. The amp runs near to class B, biased with 4 x 10-20mA in the output stage.
Max power output was estimated to be about 30W and I measure the onset of clipping at ~15Vrms into 8.2R (~28W)
Schematic: front end and output stage:
An externally hosted image should be here but it was not working when we last tested it.
The output transformer is a custom transformer (3x720R) from Sowter UK. Global negative feedback is kept low, about 10dB, but there are no problems to apply more feedback to get even better technical results. Personally I am not a big supporter of global NFB, but used in proper amounts it does good things.
With 10dB NFB I achieved these results:
Zo : 0.8 ohm
THD: ~0.6% (50Hz, 1kHz, 10kHz, @ 25W Po) (2nd and 3rd harmonic dominant)
Frequency response: 10Hz-100kHz (+0/-0.5dB). –3dB at 230kHz.
30kHz square wave response (4V pp) is not that bad:
An externally hosted image should be here but it was not working when we last tested it.
Jan E Veiset
After 25 years of waiting and thinking
Hi
This is my humble project. A 2x35 Watt power amp (driven by CD or a RIAA tube amp) equipped with EL34's and ECC82's. The ECC82's are coupled as differential stages with solid state current sources. The transformers behind the "fence" are all Lundahl's. The EL34 are old Telefunken.
Hi
This is my humble project. A 2x35 Watt power amp (driven by CD or a RIAA tube amp) equipped with EL34's and ECC82's. The ECC82's are coupled as differential stages with solid state current sources. The transformers behind the "fence" are all Lundahl's. The EL34 are old Telefunken.