|
Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
For Sale Ads |
Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.
Original Message
ECC99 Pin 9 confusion
Posted by banpuku on February 14, 2017 at 09:38:00:
I am confused about the filament heater wiring for pins 4, 5 and 9. I have read various information on the audio blogs and no definitive answer.
I want to use only 1/2 of the ECC99 with a 6.3V for the heater. So, which pin(s) should get the heater voltage (pins 4 only, 4 and 5, 4 and 5 tied together)? Where should I connect pin 9?
Any help would be greatly appreciated. I will be doing a nice write-up on the ECC99 and 2A3 tubes for Audio Asylum in the near future. Thus, I want to ensure that the tubes are connected correctly and biased optimally.
Thanks, Pat.