[Hammarlund] tube shields

[Bob Young]

Les,
 
While I do not have the sophisticated temperature measuring 
capabilities, I have long suspected that the results you've posted was 
the case.
 
I long done away with those pesky shields, both in R-390As and SP-600s.
 
They DO seem to run cooler!
 
Bob - N0DGN
 
The original manuals that came with the R-390/URR said to do away with about 90% of the tube shields which I did. The manual only leaves on about 5 or 6 out of the 32 tubes in the 390 for RF purposes

Bob 
KB1OKL