[ARC5] BC453 on 24V

[Ian Wilson]

The Sylvania data sheet has 600mw output in Class A2 transformer-coupled
service with
a 28V supply. Not bad.

I'd forgotten that it has a loctal base.

73, ian K3IMW


On Wed, Dec 11, 2019 at 3:26 PM J Mcvey <ac2eu at yahoo.com> wrote:

> My bad. the 28D7 is  a dual pentode LOCTAL . The datasheet says that each
> pentode has a plate dissipation of 3 watts. 400 ma heater!  I didn't think
> there could be TWO dual pentode types but there is.
> The R392 uses 26a7 which is dual pentode OCTAL . Plate dissipation on each
> section is 2W.
> with 600 ma heater. ( no wonder it gets so hot)
> None the less, Both can be replaced with a pair of IRF640's and few
> resistors. the pair idle around 5ma.
>
> On Wednesday, December 11, 2019, 4:19:45 PM EST, CARL HUETHER <
> k1uhy at comcast.net> wrote:
>
>
> Wow, that is the first Ive read about that tube being used.
>
> Several years ago I picked up an elevator control module using 3 of them,
> Sylvania if I remember. One was good for 1W of Class C CW but I never tried
> to see how much it could be pushed in voltage and power.
>
> Carl
>
> On December 11, 2019 at 12:46 PM Ian Wilson <ianmwilson73 at gmail.com>
> wrote:
>
> Some of those receivers used the 28D7 dual beam power tube. This is quoted
> as 175mW audio output in push-pull with 28V supply. That reminds me, I
> have
> some of these "somewhere"...
>
> 73, ian K3IMW
>
> On Tue, Dec 10, 2019 at 4:24 PM Robert Eleazer < releazer at earthlink.net>
> wrote:
>
> I used to power up the filaments on my R-11A and reduce the B+ until it
> quit.  I found I could get down to just a little before I got to 28VDC and
> still be able to hear a signal.  And with the basic R-11A there was no
> volume control or gain control.  You just plugged in a headset and listened.
>
> Note that the various BC-1206 receivers all work on 28VDC B+ and filament
> voltage, as does the R-392, and numerous tube type marker beacon receivers,
> including the BC-357, BC-1033, and R-666.
>
> WAyne
> WB5WSV
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