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Old 24th August 2015, 09:14 PM   #1
jcdrisc is offline jcdrisc  Australia
diyAudio Member
Join Date: Jun 2011
Location: melbourne
Smile my great sounding tube hpa

The best sounding HPA I ever made was using a 6EM7. First stage 10k anode load, cathode 300R unbypassed. 470N polyproplene coupling cap. The large triode CF has 140V on the cathode with a Vcc of 280V. Quiescent through the CF is 50mA. Output coupling is two 47u/160V in parallel.
I used Broskie's TUBECAD to optimise the design. An absolute must have program.
The great sound and very coherent imaging was mainly due to a star grounding scheme, also I put DC on the heater.
Does anyone know the Russian equivalent of the 6EM7 ? It is a great tube and probably underutilised in audio applications.
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