I’m sorry but the tube selection issue for the Horizon is still confusing to me. I’m seeing some conversation regarding Pacific and anode choices and then discussion of Horizon tubes. Maybe my decoder ring is broken, but I’d like to ask a few questions to gain clarity.
For the Horizon, this is the tube configuration as I understand it:
View attachment 86936
#1 is the recti- No adapters needed, correct? If so, no issues here. Many choices available
# 4-7. These are for KT88/KT-170/KT-150/KT66/KT77/EL34 or equivalents. No adapters needed for any of these, correct?. If so, no issues here.
# 2-3. These are driver tubes, 6SN7’s or equivalent (PSvane tennis ball/ Shuguang Treasure cv181-z/ Melz 1578 (no adapters needed, correct?)
Now, if you want to use 6900, 5687, 7119 or 6922/6DJ8, then it seems you need adapters, right? My confusion is which adapter for what tube? An ECC82 is not a 6922, in fact it is nothing like it. A 6922 is an ECC88 or as the Americans call them E88CC, and ECC88 has no centre tap in the heaters as they are wired in parallel. That means pin 9 is a screen and the heater voltage is 6.3v only. An ECC82 or 12AU7 has series heaters between pins 4&5 with pin 9 as a centre tap. (I think, but I may be wrong.)
Let’s be very clear and list what adapter is needed for which tube. Furthermore, if you’re using tube adapters, it may be wise to spend a few dollars more to get high quality adapters (such as those made of Teflon and available from Woo Audio)
https://wooaudio.com/accessories/various-tube-adapters
So can someone please tell me, which specific Woo adapter (from their web site selection) I will need for each of the following tubes that are available to me:
- 6900
- 5687
- 7119
- 6922
- 12AU7
Thanks in advance
Marty