Quote:
Originally Posted by BearCityUSA
There is no issue running those kt88s with a 5y3. Since it has a significant voltage drop it will effect the sound by supplying less voltage to the pentodes. Less power but also a change in the sound. Now if you are running 6v6/6v6g (not 6v6gt) or 6f6/6f6g you need to provide those with reduced voltage by using a 5y3. Otherwise, including the 6v6 gt, mix and match to find the best sound. “Have at it” as DH would say.
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In my experience, low voltage drop (VDrop) rectifiers work best for KT88's:
5AR4/GZ34,
5V4-G/GA,
5Z4 (my personal favorite in this context)
83,
83-V
All these range from a max VDrop of 25 to about 15. In the 5Z4 case, it is 17
On another note, the 80 (i.e., 5Y3) VDrop measures at 60, which is the ceiling of Five Volt Fullwave Rectifier Tubes. I have not tried the 80 with my KT88's for this reason, but I can give it a try ...