Hi Phil;
On the 77 grid trip.. I don't know about the "all". There seem to be many
flavors of the 77. From my manual (model 77, no D) "Alpha 77's grid
overcurrent relay system will not permit the amplifier to be grossly
overdriven.." I've tripped the relay; it's in there.
I'm still working on the Amp. When I get the input problem solved I'll
report back.
I looks as though Alpha made more Amps than model #'s.
pete
Peter Gerba
pgerba@crl.com
On Thu, 7 Aug 1997, Phil Clements wrote:
> At 01:28 AM 8/6/97 +0100, you
>
> Snip.....
>
> >The outside number means very little to me anymore, just whats under the
> >hood. Some of the weak links that may still be in the amps not
> >professionally converted will be the 800 ma choke.
>
> There are no chokes in Alpha power supplies.
>
> >Power transformer might be to small for 4 kw input.
> The power transformer is good for 5900 watts input. (The ones with the 20 amp
> filament winding)
>
> >Plate meter out of range.
>
> There are resistors that come with the two-tube kit to make the meter read
> 2 amps f.s.
>
>
> >Grid current trip circuit not working properly.
>
> Alpha 77 series amps do not have any grid-trip circuitry...you must be very
> careful.
> A 100 watt exciter can damage a pair of 8877 under certain operating
> conditions.
>
> (((73)))
> Phil, K5PC
>
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