[Heathkit] Me and My SB 230 are needing HELP

[Carl]

A chattering DC relay often means it is being fed AC. Check the voltage 
source.

Carl
KM1H


----- Original Message ----- 
From: "Glen Zook" <gzook at yahoo.com>
To: <heathkit at mailman.qth.net>; "Bill/K4FLH" 
<k4flh at hamsandmotorcycles.com>
Sent: Saturday, September 27, 2008 5:00 PM
Subject: Re: [Heathkit] Me and My SB 230 are needing HELP


> Several things:
>
> First of all, your 8873 tube may being going "south".  If so, then be 
> prepared for some REAL SERIOUS cost for a new one.
>
> Then the contacts on the meter switch (which also switches from the 
> exciter only operation to using the linear) may need cleaning or even 
> replacement.  According to the schematic this would be the front 
> (towards the panel) wafer.
>
> Next, the bias rectifier may have gone bad, C-18 may have gone bad, 
> and R22 may have gone low in value.
>
> Then, the contacts on the phono jack into which the control line from 
> the exciter may have become loose.
>
> Of course the control from your exciter may have developed problems as 
> well as the cable between the exciter and the linear.
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
> --- On Sat, 9/27/08, Bill/K4FLH <k4flh at hamsandmotorcycles.com> wrote:
>
> From: Bill/K4FLH <k4flh at hamsandmotorcycles.com>
>
> I need HELP! My SB 230 is driving me crazy! The relay chatters when 
> keyed and I can't figure out why.
>
> I've replaced the .01 mf cap (C17),  the diode across the relay coil 
> (D 17), checked the 10 watt resistor across the coil (R23) also.I made 
> sure the grid ring isn't shorted.
>
> I had replaced the thru caps C23 & C31 because one snapped awhile back 
> .The amp worked fine after I did this. I shut it off, came back next 
> day turned it back on and when I keyed it there was a snap and then 
> the relay started this chattering. I can't see any arching and no 
> components where blown.
>
>
>
>