[Amps] Heathkit Warrior High Plate Current

[Gary Schafer]

Check the meter shunt. Hook a known good meter in series with the plate
current meter circuit to see if they read the same. Keep your fingers out of
the high voltage.

73
Gary  K4FMX

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Eddie Bradshaw KJ4R
> Sent: Sunday, October 19, 2008 8:10 PM
> To: amps at contesting.com
> Subject: [Amps] Heathkit Warrior High Plate Current
> 
> I recently bought an "as is" Heathkit HA - 10 Warrior.  The amp is in good
> overall condition, but I'm having a problem that has me stumped. Here is a
> little background........ The amp has relays installed for transmit /
> receive switching and standby bias switching.  The standby bias is around
> -75v and the bias during transmit is -7v.  The plate current is around 30
> ma with the cutoff bias applied which is normal.  When the amp is switched
> to transmit, the plate current rises to 100ma, which is also normal. I've
> experimented with adjusting the transmit bias to the recommended -4.5v but
> it has no effect on the problem.
> 
> The problem arises when I apply even the slightest level of drive to the
> amp.  The least amount of drive causes the plate current to rise to almost
> 500ma or higher with very little output power. The tune and load controls
> seem to have no effect on the plate current.  I've tried the amp on all 5
> bands and the problem is the same on each band.  I'm driving the amp with
> a Kenwood TS 530 (tube output). I suspect the swinging choke may be bad,
> but I'm not sure how to test or verify it.   Any ideas from anyone who has
> experience with this amp would be much appreciated.   Eddie KJ4R
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