[Boatanchors] 1625 tube

[Vic Rosenthal]

Glen Zook wrote:

> The 1625 is the 7-pin "medium" base and not octal.

More 1625 trivia: one other difference between the 1625 and 807 that should be 
noted is that the 1625 has its supressor grid internally connected to the 
cathode, whereas it goes to one of the base pins in the 807.  This means that 
you cannot use an unmodified 1625 in a gg amplifier.

To get really trivial, some brands of 1625 (which? -- now we have gone past the 
point at which even my knowledge of trivia is exhausted) had this connection 
made in the base.  So you could drill a small hole in the side of the base of 
these, heat the pin with a soldering iron, and stick a needle-nose plier in the 
hole to lift the wire from the suppressor and move it to another pin!

It sounds silly, but since 1625's were essentially free in the '50's and early 
'60's many people did it.

-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco