Hi Phil;
Ya, with all the hair pulling it's hard to get a free education on here.
Send me some non public mail and tell me how your amp is comming.
cu phil
pete
Peter Gerba
pgerba@crl.com
On Thu, 7 Aug 1997, Phil Clements wrote:
> At 09:26 AM 8/7/97 -0700, you wrote:
> >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.
>
> Thanks, Peter, I stand corrected on the grid-trip on the 77. I have only
> seen 1
> or 2 at flea markets, and never a manual. Too bad they did not continue the
> circuit in the 77DX/SX models.
>
> All this arguing about grid dissipation is moot. Grid-trip circuits work on
> current, not watts. The important thing is that a single 8877 grid be limited
> to 70-90 ma at all times, and as Tom said, be a very fast acting circuit.
> This will protect the tube in case of loss of load or light loading.
>
> I never cease to continue my education here on the reflector....thanks!
>
> (((73)))
> Phil, K5PC
>
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|