[Amps] Heathkit Warrior High Plate Current

[Carl]

>From the description it appears that the DC voltages, currents and 
metering functions are fine.

It does sound as if one or more tubes are defective. Try running with 
only one tube at a time. Apply about 10-20W of drive on 80M. A good tube 
should show some output and the Tune/Load controls will have an effect.

Carl
KM1H


----- Original Message ----- 
From: "Gary Schafer" <garyschafer at comcast.net>
To: "'Eddie Bradshaw KJ4R'" <kj4r at ftc-i.net>; <amps at contesting.com>
Sent: Tuesday, October 21, 2008 7:10 PM
Subject: Re: [Amps] Heathkit Warrior High Plate Current


> 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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>
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