OK, DUST OFF YOUR KEYBOARDS, HERE COME THE QUESTIONS

[Mark A Moss]

On Sun, 26 Jul 1998 14:28:06 -0400 GREGORY HEATH <KB2QQM at EMAIL.MSN.COM>
writes:
>OK, more questions......
>
>With wirewound resistors, with figuring wattage rating,,,(if you have
>no
>parts list), Is it basically the same as caps...in that as long as you
>have
>the minimum value, can you go higher with the wattage like the voltage
>rating with capacitors?

Yes.

>On old axial caps..I have noticed a banded end...what end is that + or
>-?

Most that I have seen have an indented band on the positive side (these
are electrolytic)  it may be different for other makes/brands/types of
caps.

>In all the old rigs, I see that "chrome-looking" wire darting all over
>the
>inside of the chassis, especially from the switches to the crystal
>holders,
>and tubes.  What kind of wire is that and where can I get it,,,,or why
>did
>they not just use solid copper wire?

RF skin effect.  As frequency increases, current flow in an increasingly
thin ring on the outside of the conductor.  This means you can use a more
conductive metal, such as silver for the outside of the wire, and a
cheaper, less conductive metal for the inside of the wire.

>where does anybody find the hard to find caps like    .002Mfd  @ 400V?
> I
>have checked Mouser, and Tech America, any other ideas.  I have tried
>coming
>close but nothing close.
>anyone have any ideas.

Here are some places:
        Surplus Sales of Nebraska
        http://www.surplussales.com

        All Electronics Corporation
        http://www.allcorp.com/

        Antique Electronics Supply
        http://www.tubesandmore.com/

        Communications Concepts Inc.
        http://www.communication-concepts.com/

        RF Parts
        http://www.rfparts.com/

>On the outside of the chassis, on top, below the cover of the DX60,
>the
>chassis is all sort of
>speckled rust color, how do you clean that up to be normal aluminum,
>without
>sand blasting?
>I have tried scrubbing, but no luck.

Steel wool will remove rust and polish alluminum, but will destroy any
finish.  Good luck removing the rust without damaging the finish.

>where can I find out how to decipher the mica caps with the color
>buttons,
>to normal modern day values?

Look in the 1998 ARRL Handbook.  No matter what your opinion on the ARRL
(no replies please!), this book has information on almost anything at all
related to amateur radio or electronics.

>On the DX60, where the power cord comes into the chassis, there is a
>little
>box on mounted on the side, and the pwr cord plugs into two cans, at
>600volts, are these non-polarized caps?
>what are they for?  are they a filter?  they are made by sprague, and
>are
>marked .01-600v
>@20 amps, and lead to the pwr supply transformer.   I have never seen
>caps
>like this, in that they are metal....

Sound like feed-through caps.  They are used to help filter out line
noise.

>Has anyone ever put two 6146's together inside a DX-60 final-cabinet.
>I
>have a dx-60 with two tube sockets, they both are equipped with disc
>caps,
>but only the one near the chassis wall has the hookups.  If someone
>did
>modify it for more pwr,  would not the filter section have to be
>modified?
>I knew the wiring diagraphm had something missing, but it  was just
>staring
>me in the face.  looks like lots of work to do, yet.

Never tried it.  I bet someone else has though.

>....I would read on my own...but it is much more fun picking
>everyone's
>brain.  I remember more through the experience of exchanging thoughts
>than
>taking notes.
>Greg

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