13-05-2020, 08:23 PM
(This post was last modified: 13-05-2020, 08:34 PM by Mike Watterson.)
(13-05-2020, 04:50 PM)Kalee20 Wrote: I doubt that - so I had a look in an EL84 (luckily to hand right now!) and doubt it even more.Obviously then I'm thinking of something else and confused.
The g3 support rods can be seen through a couple of apertures in the anode, and there definitely is a spiral grid wound on them.
Mullard / Philips denied the beam tetrode (Not Invented Here) and did describe a few of their valves as pentodes for marketing purposes, eg DL92 which definitely is a BT. But not the EL84.
Either old age, lack of fresh air, food, coffee ...
Though I'd have to break one. I can't see inside it, so I'll take your word for it. Either I've misremembered, been misinformed or confusing it with some other valves.
I have a box of dead valves and mean to dismember them like this:
https://www.radiomuseum.org/forum/ef89_anatomy.html#1
An interesting article on the Beam Tetrode.
https://www.radiomuseum.org/forum/beam_p...guage_id=5
Will a KT61 or KT63 sound much different to an EL33 or EL34 or EL84? Same drive, HT and audio transformer.
I'm sure it wasn't a KT66 as those are big.
