From: Boatanchors on behalf of William
Morton
Sent: Saturday, November 7, 2020 12:50 PM
To: boatanchor
Subject: [Boatanchors] Question for Eimac 4-65A Tube
Hello Everyone,
My son and I have a question regarding firing up the filament of a 4-65A tube
with no connection to the grid or plate
From: Boatanchors on behalf of Scott
Johnson
Sent: Saturday, November 7, 2020 5:44 PM
To: 'William Morton' ; 'boatanchor'
Subject: Re: [Boatanchors] Question for Eimac 4-65A Tube
CAUTION: External Sender
It is basically a tungsten lamp with a Titanium lampshade. Go for it.
Scott V
W7SVJ
5111 E. Sharon Dr.
Scottsdale, AZ 85254-3636
H (602) 953-5779
C (480) 550-2358
scottjohns...@cox.net
scott.john...@ieee.org
-Original Message-
From: Boatanchors On Behalf Of William
Morton
Sent: Saturday, November 7, 2020 11:51 AM
To: boatanchor
Subject: [Boatanchors] Question for Eimac
: Saturday, November 7, 2020 11:51 AM
To: boatanchor
Subject: [Boatanchors] Question for Eimac 4-65A Tube
Hello Everyone,
My son and I have a question regarding firing up the filament of a 4-65A
tube with no connection to the grid or plate (and no plate cap heat sink,
either): If we light up
Shouldn’t be an issue. Just observe the 6.0VAC rating. Running it from a 6.3V
trans may not give you the internal transformer drop you need to be at 6.0V. If
need be put a very low value 0.1 ohm, 5 watts or more in series. But check the
actual voltage you get with your supply.
73 Howie WB2AWQ
NO, itv should not for that length of time. They usually burn in the tubes
for longer than that. Rob K1DFT
On Sat, Nov 7, 2020 at 1:51 PM William Morton
wrote:
> Hello Everyone,
>
> My son and I have a question regarding firing up the filament of a 4-65A
> tube with no connection to the grid
Hello Everyone,
My son and I have a question regarding firing up the filament of a 4-65A tube
with no connection to the grid or plate (and no plate cap heat sink, either):
If we light up the filament and leave it glowing for a long time, is there any
danger to the tube? It would be akin to
