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ecc802s SRPP preamplifier
ecc802s SRPP preamplifier
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Old 17th November 2011, 11:01 AM   #1
korabetsni is offline korabetsni  Greece
diyAudio Member
Join Date: Mar 2011
Default ecc802s SRPP preamplifier

i have finished a preamplifier with the ECC802S Tesla tubes. The circuit diagram is here: DIY ECC802S (12AU7 / ECC82) Vacuum Tube SRPP Preamplifier
The schematics shows on the tubes pins 6 about 215volts. I have only 205volts and i am using the same power supply but with larger capacitors.(not 3x100uf but 3x470uF). Maybe my tubes draws a little more current. Is this voltage ok? Also i have a problem with the heater voltage. I am using the LM317 to supply 6,3vdc. Without the tubes i have 6,3v but when i put the tubes on the heater voltage drops to 5,8v possibly because the transformer cannot supply the current needed.(the transformer voltage drops from 8 to 7Vac with the load) Is this ok or i must rewind the transformer? (i made the transformer by myself).
Thank you
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Old 17th November 2011, 04:49 PM   #2
radiostar is offline radiostar  Yugoslavia
diyAudio Member
Join Date: Apr 2009
205V is ok, you need more input voltage on LM317, 7 volts is not enough ...

Good luck!
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