• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Photo Gallery

6s19p / 6n6p / lme49720,15 watts

6s19p / 6n6p / lme49720,15 watts
 

Attachments

  • IMG_20190323_232748.jpg
    IMG_20190323_232748.jpg
    744.7 KB · Views: 654
  • IMG_20190408_162339.jpg
    IMG_20190408_162339.jpg
    699.1 KB · Views: 634
  • IMG_20190509_103216.jpg
    IMG_20190509_103216.jpg
    741.2 KB · Views: 616
  • IMG_20190509_103121.jpg
    IMG_20190509_103121.jpg
    448.7 KB · Views: 605
  • IMG_20190501_170226.jpg
    IMG_20190501_170226.jpg
    580.7 KB · Views: 291
  • IMG_20190501_165943.jpg
    IMG_20190501_165943.jpg
    573.1 KB · Views: 568
  • IMG_20190501_165318.jpg
    IMG_20190501_165318.jpg
    342.3 KB · Views: 262
It weighs an absolute tonne as it has six heavy transformers and an Oak frame.

Although it outwardly appears like two mono-blocks in one chassis it isn't.

The toroids on the top of the chassis add together to provide the AC for the B+.

The toroids on the bottom of the chassis provide the HEATER and Cathode bias.
 
Last edited:
6s19p / 6n6p / lme49720,15 watts

one more photo
 

Attachments

  • IMG_20181119_115428.jpg
    IMG_20181119_115428.jpg
    692.8 KB · Views: 307
  • IMG_20190102_135256.jpg
    IMG_20190102_135256.jpg
    680.4 KB · Views: 234
  • IMG_20190113_103018.jpg
    IMG_20190113_103018.jpg
    788.7 KB · Views: 229
  • IMG_20190113_103637.jpg
    IMG_20190113_103637.jpg
    605.5 KB · Views: 213
  • IMG_20190113_103825.jpg
    IMG_20190113_103825.jpg
    443.9 KB · Views: 156
  • IMG_20190114_182826.jpg
    IMG_20190114_182826.jpg
    725.2 KB · Views: 192
The populated PCB is available from E-Bay which is a real bonus. The bias circuit needs a bit of modification as discussed in the build thread. Other than that it is a really easy and high quality build.

4 x EL34 and 4 x 12AU7.

Hammond 1650H opts.

I put socket savers on the 12AU7s so they poke up a bit higher on the chassis.
 

Attachments

  • s-l1600 (1).png
    s-l1600 (1).png
    885.1 KB · Views: 255
6s19p / 6n6p / lme49720,15 watts

output transformers шл 25\25 and chokes are homemade , the power is converted from industrial тс70.first, the circuit was on a breadboard and the parameters of the output transformer were tested to get good performance, then a transformer with taps 4 and 8 R
 

Attachments

  • 26082017758.jpg
    26082017758.jpg
    789.2 KB · Views: 772
  • 04012017686.jpg
    04012017686.jpg
    541.2 KB · Views: 752
  • 27082017760.jpg
    27082017760.jpg
    475.7 KB · Views: 754
Last edited:
Here is the E-Bay link.

Just so darn curious, but this link, like several other eBay listings that I’ve noticed over the past few years, uses the word ‘fever’. A word of our times you could say. But I’d like to know what Chinese word keeps getting auto-translated into ‘fever’ and what the heck was the author really trying to say?