[R-390] Filter caps

[Barry]

> I "restuffed" the filter capacitors because it was there and I had time on
> my hands, but truly guys it is not worth the effort!!!
> Solder the replacements to an Octal socket or under the chassis.
> 
> Jim

I saw one version where the guy ran the positive leads down through the appropriate pins in the octal 
socket from the top side and soldered them to the pins underneath, bunched the negative leads 
together to a lug and attached the lug to the post that functions as the capacitor clamp.  Pretty 
clean method, but it requires there to be a hole in the octal socket's pin (not sure if all the octal 
sockets are made that way).  Of course this requires axial-leaded caps.

On a side note, I had a very fun evening last night.  I finally managed to get the HP606A on the 
workbench and started checking it out.  The dial plate was way off from where it should be (something 
like 10 to 15 degrees) and I figured out that removing the big tuning knob revealed four screws that 
clamp the dial plate to the collar.  I eye-balled the dial to have about the same amount of over-
travel on both ends of the hairline and tightened the screws.

The range change knob was incredibly hard to turn and found that was mostly due to hardened lubricant 
on the shaft itself.  I disassembled it, cleaned, and relubed it and the range switch is much easier 
to rotate now.  I was figuring it was something much deeper in the mechanism and was surprised to 
find the dried lube could make that small shaft so difficult to turn.

When I started checking out the calibration, it was almost spot on on all but the top range.  I must 
have gotten very lucky when I clamped the dial plate back in place.  One range needed a slight tweak 
on the upper end and all but the top range didn't really need anything done.  There isn't enough L or 
C to bring the top range into calibration, though.  I'm not sure what I can do about that.  I suspect 
something not on the oscillator turret that's not off enough to effect the lower ranges but is 
throwing the high range off.  I don't think I could add/remove L on that upper-range coil given the 
way it is made.

Anyway, it sure was fun to get back into working on a piece of BA gear again.  Other than being dusty 
and needing some pots cleaned, some missing screws replaced, and new line-filter caps, it looks like 
a very nice generator.  I think it has all Hewlett-Packard branded tubes as well.

Barry - N4BUQ