[ARC5] 1625 question

[Michael Clarson]

Ron: Not sure if it helps, below is a link to the datasheet for the
6BG6G (not GT, GTA of GA versions) tube which is remarkably similar to
the 807, but rated for sweep tube service (dfferent ratings than RF
amplifier service).

https://frank.pocnet.net/sheets/127/6/6BG6G.pdf

On Tue, Feb 6, 2018 at 1:43 AM, Robert Downs via ARC5
<arc5 at mailman.qth.net> wrote:
> The absolute max rated voltage given in the tube manuals is the DC output
> voltage of the power supply.  And includes a safety factor plus assumes that
> at that voltage, the peak voltage on the plates is going to be 1500 volts.
> So operating the tubes with 1000 VDC on the plates depends upon “using” some
> or most of that safety factor.
>
>
>
> Robert Downs - Houston
>
> WA5CAB
>
>
>
> Sent: Tuesday, 6 February 2018 12:07 PM
> To: ARC5 at mailman.qth.net
> Subject: [ARC5] 1625 question
>
>
>
> I am reading some old surplus manuals and find that they like to use the
> 1625/807 as a power amplifier ( typical ARC-5 parallel style ) and suggest
> that one could run up to 1000 volts on the plate. Every listing I can find
> shows a absolute maximum plate voltage for the 1625 of 750 volts. Yes, the
> operating plate voltage will depend upon class of service and therefor duty
> cycle but isn’t absolute maximum absolute maximum? Now I can remember
> pushing the stated maximums a bit and I even have a friend who admits
> running a tube in a coffee can full of water to get a few more watts out of
> it.  But none of it was “published” that I know of. What am I missing?
>
>
>
>
>
> Ron K3PID
>
>
>
>
>
>
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