Re: Another DIY project finished

Hi Don,

> Just out of interest, how did you wire the 6V6 as a pentode?
> It is a beam tetrode.

I have forgotten to include the tetrode-pentode conversion in
the walkthru, indeed!

On the other hand, probably everyone interested in tube tech has
done that already I suppose, since actually this is quite simple
to do. If you have not yet, here is a short how-to for you:

Take a glas envelope 6V6, a hammer and smash the glas envelope
gently (you could use a metal envelope 6V6, but smashing glas
is so much more fun). Take care capturing the vacuum, since we
will need it later. Remove the plate structure and the beam
forming plates. Solder some windings of fine wire to the posts
that did hold the beam forming plates to make the supressor grid.
Use one of the formerly not connected pins in the base to make a
connection to the new supressor grid. Take a suitable glas tube
(neck of a clear wine bottle comes to mind) and a torch. Use the
torch to carefully melt and join the bottle neck to the base,
while putting the vacuum back in again (no problem to re-use the
previously used vacuum here - do not trust audiophools that try
to sell you special new old stock vacuum from TFK or Mullard
plants - those most likely are fakes to rip your money). Last
but not least, at the socket, wire the new supressor grid pin
to the cathode pin.

Wasn't that hard, wasn't it?

Tom

--
The opposite of a correct statement is a false statement. But the
opposite of a profound truth may well be another profound truth.
- Niels Bohr
.

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