VTVM Mod

[Alan Dean Martin]

Here' some silly trivia:

The 12AU7 replacement tubes were called "Fetrons". They had originally
been developed for Bell Telephone equipment which benefitted from
improved reliability without having to replace costly equipent.
Tektronix also offered some upgrade sets for certain tubes in their
scopes. The 6AL5 replacement was just 2 small signal diodes.


Ray Allen, Sr., W2KBR/3 wrote:

> Yep, Strange how things come back to ya after years...
> My IM-18 was built in 1975, and I saw that Ad for those SS "inserts"
> for the tubes, but never got them. My IM-18 still has the original
> tubes on board...and it still works.....73 Ray
> --
> Ray Allen, Sr., W2KBR/3
> 8303 Grainfield Road
> Severn, Maryland, 21144-2331
>
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