I need to replace the power tubes in my VT100 MkI. Currently have the SED 6550C. Thinking of using the Genalex Gold Lion KT88 as I have heard that it is sonically better or should I stick with the SEDs.
The KT-120 is not a drop in for the 6550. In addition to the issues cited by Hifigeek1, the KT-120 specifies a maximum grid 1 resisitance of 50k, whereas many amps using 6550 tubes use a grid resistance of 100K.
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