I can't reach the guy who help me to build my first tube project (Phono Dude 12ax7 verion) so I need some help..
I almost finish, last night I do all my measurement and I just need validation before going foward on this project I start since 2012 !!!
Thanks.
I almost finish, last night I do all my measurement and I just need validation before going foward on this project I start since 2012 !!!
Thanks.
Attachments
...need validation...
What are your concerns?
The DC voltages look reasonable. All tube-work is +/-20% at least. SPICE models often disagree with real tubes. Your B+ is way within reason (thanks to the bigger 30K) and the gain-stages' mid-points sit near the middle (a bit lower in the first un-biased stage, as expected).
Heater-cathode voltage breakdown? Your heater arrangements are not shown, and 0V on 1st cathode to 170V on 3rd cathode is a large spread.
Have you checked for DC on the output? There will be a turn-on spike but it should settle to much less than a Volt after a minute.
Put signal through it; that's the only true test.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.