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SSE build - power measurements

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J

jsabev

Member
Joined 2014
#1
Hello everyone,


I have build my SSE with Hammond 274BX power transformer, 193J Choke and 1628SEA output transformers.



The board was very straightforward to stuff and assemble. Many thanks to George for his effort in the design of the SSE amp.


I have taken some measurements and the power numbers seem kind of low.

With new production (New Sensor Svetlana) KT88 and the following parameters:


B+ voltage: 442V
plate voltage: 430V

Voltage drop across cathode resistor (560 Ohms): 42V
Plate dissipation: ~30Watts


Using 8ohm dummy load resistors, I get ~1.5W of power in both UL and triode mode. The strange thing is that I can actually hear the 1khz test signal through the amp.

The amp sounds great otherwise.



KT-88-triode.png - Google Drive


KT-88-UL.png - Google Drive


Are these numbers in line with other builds?


view
 
Last edited:
#2
Responding to my own post.


Turns out I had the probes overloaded so the numbers are not correct. After realizing my mistake, the power measurements are more in line with what I expect


~10 watts in UL
~ 7 watts in triode
 
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