6 Aug
2014
6 Aug
'14
3:10 p.m.
On 08/06/2014 10:52 AM, Rick Bensene wrote:
I pulled out one of the tubes. It is a mini-style
tube made by RCA.
However, it has no part numbering on it at all. It has 8 pins, and
given its application, it's probably a simple triode. The other tube is
difficult to get out without disassembling more, so I'm not going to
mess with it. I do hope, though, that these tubes are good, as
getting replacements could be difficult if either or both are not good.
Not 7 or 9, but 8 in a miniature tube? I don't think I've ever seen one
like that.
The nice thing about glass tubes is that you can often guess at least
the function by examining the visible parts of the internals. You can
count the number of electrodes, determine if there's a heater-cathode
setup or just a filament. Sometimes you can even figure the pinout.
--Chuck