I am a bit disappointed that you left your original idea. When the jornal came out I was almost prepared to try that design and I am even today ready to try it.
There may be an EL34 project in the pipeline w2ith some leftovers (trannies), but I have to be a bit ON- and, now OFF-topic by sharing another hybrid amp.
There may be an EL34 project in the pipeline w2ith some leftovers (trannies), but I have to be a bit ON- and, now OFF-topic by sharing another hybrid amp.
Attachments
One thing I am going to try is to reduce the B+ down to 450V.
I'm just going to add 200R 50W resistor in series with B+ between the reservoir caps to make CRC.
Each amplifier should draw approximately 125mA.
I'm just going to add 200R 50W resistor in series with B+ between the reservoir caps to make CRC.
Each amplifier should draw approximately 125mA.
I'm still waiting for the schematics for my alternative PCB.
I'm guessing that the EL34 version of the Williamson 5-20 will also use B+ @ 450V.
What would the B+ be with KT88s ?
It might be easier to use the hotter tubes.
I'm guessing that the EL34 version of the Williamson 5-20 will also use B+ @ 450V.
What would the B+ be with KT88s ?
It might be easier to use the hotter tubes.
The PCB and its schematics allow for variations in tubes.
EL34 should give about 40W
KT88 about 60W
There is also provision for KT99 and KT100 but they are rare.
EL34 should give about 40W
KT88 about 60W
There is also provision for KT99 and KT100 but they are rare.
The new thread is here - https://www.diyaudio.com/forums/tubes-valves/368756-williamson-5-20-40w-build.html#post6556625