[ARC5] Attic Archaeology

[Fuqua, Bill L]

  Yep, I used to buy 5/$1 from B&A years ago and pick out the right ones.
I did it the hard way by heating the base to melt the glue and then separating the 
Beam forming plates from the cathode and put it back together again with 
some epoxy which was relatively new when I was a teen. Then I discovered that
with care you could drill a hole in the base and carefully unsolder the cathode pin
and separate  the wires and relocate the beam forming plate wire to another pin.
  Some were really 12 volt 807 and some were not. Most that I got from B&A were
the right ones. I can't remember which manufacturer's were the right ones now.
It has been over half century ago.
73
Bill wa4lav

________________________________________
From: Glen Zook [gzook at yahoo.com]
Sent: Sunday, April 19, 2015 10:30 PM
To: Fuqua, Bill L; ARC-5
Subject: Re: [ARC5] Attic Archaeology

Only if the 1625 tubes are made by certain manufacturers in which the beam forming plates / G-3 are connected, to the cathode, externally to the glass envelope.  With those tubes, the G-3 connection can be rerouted so that they can be grounded.  Unfortunately, in the majority of 1625 tubes, that connection is made internal to the glass envelope and, as such, those tubes cannot be used in a grounded-grid amplifier.

Glen, K9STH

Website: http://k9sth.net

________________________________
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
To: ARC-5 <arc5 at mailman.qth.net>
Sent: Sunday, April 19, 2015 7:06 PM
Subject: Re: [ARC5] Attic Archaeology

1625's Just what you need for your LA-400.