[Heathkit] SB-201 AMP

[Larry Knapp]

Ron - As far as your question of "Still get 1900 volts from power supply, do
the caps need replacing? The front panel meter reads lower voltage than is
really there.  Is this normal?"....I believe 1900V is too low.  I would think
more in line with 2200V or so (maybe 2300V) at least...if your meter reading
voltage is too low (compared to some reading you have made independently), then
look for issues with the four resistors used in the voltage divider that
measure the HV to the meter....I don't have the exact value of them, but there
are three that come off the HV line and then at the junction of the three there
is a wire that goes to the meter and also a remaining resistor...my guess is
that one or more of these (4) resistors have increased in value.  I would check
the resistance value of these.

73, Larry KC8JX

--- Ronald A Pfeiffer <Ronald_A_Pfeiffer@raytheon.com> wrote:
> 
> Acquired an SB-201 in great conition but the 572's are really weak and  2
> of the caps in the bank are blistered!  Is there a relationship between the
weak tubes and the caps?  Still get 1900 volts from power supply, do the caps
need replacing?
> The front panel meter reads lower voltage than is really there.  Is this
> normal? I've been involved in QRP so this is my first venture into NOT QRP!
> Also where to replace the 572's ?
> 
> Thanks in advance for info.
> 
> Ron - N1ZSW


=====
May your days be full of sunshine and good thoughts fill your head.
From: Larry Knapp, KC8JX, St. Joseph, Mi  49085
  Best 73's

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