[Heathkit] DX-60 Voltage/Resistance table

[Ken Miller K6CTW]

All,

Thanks again to all for the ideas on this.  Finally get to working 
on the DX-60.  

The problem area, as indicated when I put my friend
Dennis, W6DQ's O-Scope on the rig, seemed to be the 6146.  
Lifted one end of the cathode resistor off of ground and 
found that it was open, i.e. it had failed.  Bad news is 
that it still looked fine with just a little crack in the 
middle of the body of the resistor.

While working on the tube socket, noticed that two of the 
connections from the tube pins looked cracked. Once again,
W6DQ showed me how to remove the old pins and replace them
with pins from another octal socket as the one in the DX-60
is of the smaller variety and finding a replacement would
have taken a bit of time.

With the tube socket for the 6146 out, took a small wire brush 
wheel to the area around the socket to remove all of the 
corrosion. Then replaced all of the decoupling caps and the 
cathode resistor on the 6146 socket.  Then replaced some 
decoupling caps that just looked like they had gotten hot as 
they were waxy in the audio section.    

Finally reconnected the remaining wires, except the high 
voltage to the 6146 socket.  Before re-connecting the 
high voltage, re-did the neutralizing procedure.  Finally
hooked the high voltage back to the 6146 and turned power
back on. So far so good. After letting the filaments warm up 
for a minute or two, set the meter to Plate and the function 
switch to CW, and now no high current!  Gave it a quick keying 
test and it appears to be back working!  A quick check shows 
that the voltages are also back to where they should be.

Moral of the story is that an o-scope is a great diagnostic
test tool and modern metal film resistors don't fail with a
puff of smoke like the old carbon comp ones.

Have a great weekend.

73 - ken, K6CTW