[JMS] Is anyone running a 90881 amp?

Fri, 5 Mar 2004 13:57:53 -0700

ps

Cal,

You can run a push-pull amp in Class C just as well and as easily as you =
can run it in Class B or Class A.  Just set the bias and plate voltage =
according to the handbook recommendations.  By the way, we had a home =
brew push-pull 812 final on the air at W8GYH, my High School radio club, =
back in the 50's.  We drove it with a 90800, ran it class C, and =
modulated it with a pair of 211's (push-pull, class B).  So I do have =
some experience with an amplifier that was awfully close to your 90881.  =

Jim, W8KGI
  ----- Original Message -----=20
  From: [email protected]<mailto:[email protected]>=20
  To: =
[email protected]<mailto:james_millen_society@mailman.=
qth.net>=20
  Cc: =
[email protected]<mailto:james_millen_society@mailman.=
qth.net>=20
  Sent: Friday, March 05, 2004 12:46 PM
  Subject: Re: [JMS] Is anyone running a 90881 amp?

  Hi Jim:
  Thanks but that is not the information I am looking for. It looks like =
the amp is in p-p configuration so I may have to go with the Class B -45 =
VDC rating. It would be nice to hear from someone who has "been there =
done that" with a live 90881 but I think for now, they are "shelf =
queens". I hope to change that! Cal. N6KYR.=20

  Cal,

  The ARRL Handbook ratings for 812's in Class C are -175 volts bias for =
1500=20
  volts on the plate (telegraphy) and -125 volts bias for 1250 volts on =
the plate=20
  (telephony).  They are also rated at -45 volts bias with 1500 volts on =
the plate=20
  for Class B service.

  Jim, W8KGI

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