[Hammarlund] Using Nuvisters on an SP-600

[Peter Markavage]

The bulletin is also up on the Hammarlund web site:
http://www.hammarlund.info/info/sp-600/tech-bulletin-107/

Pete, wa2cwa
www.manualman.com

On Tue, 10 Jun 2008 12:25:36 -0600 "DW Holtman" <tubestuff at comcast.net>
writes:
> 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
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