[AMRadio] AM amp from 807's ? (+Rons HV Supply/Round Table)

[Gary Schafer]

Bruce - KB6LWN wrote:

>
>
> I have several 807's and 1625's here that I've obtained
> from various places over the last couple years, and I just
> recently acquired an HT-40 that should be here within the month.
> The HT-40 caught my eye because it covers the 6m band as well.
>
> Since the AM output of the Halli' is only going to be
> about 20-25 watts (and I prefer to op a little on the
> low side of maximum), I'm wondering if anyone might have
> a schematic of a proven design for using two 807's in
> push-pull, or perhaps two push-pull pairs in parallel
> that could be comfortably driven by the HT-40 ?
>

If you have 20 to 25 watts now it is not worth the trouble to add an amp
with 807s or 1625s.
4 of them will get you about 200 watts output on cw. On AM the drive
needs to be reduced to 1/4 the cw power out. That would give you 50
watts out in the AM linear mode for 4 tubes. Unless you are going to
plate modulate them then you could get around 200 watts output.
You would be better off with 811A's or something a little bigger than
the 807 type tube for an AM linear amp.

73
Gary  K4FMX