[Hammarlund] Using Nuvisters on an SP-600

[DW Holtman]

Hello,

I'm in the middle of restoring a Nice SP-600, JX-14. I know the 1st rf amp is a little noisy using a 6BA6. I have seen Chuck Ripple's suggestion to use a 6DC6 as a direct swap, only requiring a re-alignment on the 1st RF amp.

What I was wondering about is the Engineering Technical Bulletin no. 107. This is a mod to use a Nuvistaplug with two 6DS4 Nuvister tubes in a fixture, that is plugged directly into the 1st RF amp socket. It requires  no other mods except for a realignment of the 1st RF stage. I have put the Bulletin into a PDF if anyone wants a copy, E-Mail me.

Has anyone used this? Did it make any noticeable difference in the noise level? Does anyone sell the Nuvistorplug?

Any information or ideas would be very helpful.

Best,
DW Holtman
WB7SSN