OK, DUST OFF YOUR KEYBOARDS, HERE COME THE QUESTIONS

[R. L. Blaney]

One thing more about those "banded end" caps.  Many of the older tublar
caps, those with beeswax sealant and axial leads, the band indicated the
outside foil of the cap. and it was recommended that end be grounded, ( or
nearest to ground), to minimize 60 cycle hum pickup.  The band had nothing
to do with polarity, as paper types had no polarity.  Other axial lead caps,
usually with black molded cases, ("Black Beauty"), had multi-color bands to
denote the value and voltage ratings.  These bands were also placed on the
end that was connected to the outside foil, as above.
About the DX-60 with 2 tubes, trying to parallel a second 6146 would give a
very limited gain  in power, unless much work was also done to beef up the
power supply, re-work the PI network output tank to accomodate the much
lower plate impedance of the 2 tube final, and probably do some work to
assure sufficient RF drive.  It probably has been done, but would probably
need much more than just another "glow bottle".  Any way there's my $0.02
worth for what it's worth.  73 es gud hamming, de
Dick, WB8MHE
wb8mhe at bright.net

-----Original Message-----
From: Mark A Moss <reflect.kc8dei at JUNO.COM>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Sunday, July 26, 1998 4:28 PM
Subject: Re: OK, DUST OFF YOUR KEYBOARDS, HERE COME THE QUESTIONS


>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
>
>--- --- --- --- --- --- --- --- --- --- --- --- --- --
>To subscribe: listserv at listserv.tempe.gov
>and in body: subscribe HEATH yourfirstname yourlastname
>To unsubscribe:  listserv at listserv.tempe.gov
>and in body: signoff HEATH
>Archives for HEATH: http://www.tempe.gov/archives
>--- --- --- --- --- --- --- --- --- --- --- --- --- --
>

--- --- --- --- --- --- --- --- --- --- --- --- --- --
To subscribe: listserv at listserv.tempe.gov
and in body: subscribe HEATH yourfirstname yourlastname
To unsubscribe:  listserv at listserv.tempe.gov
and in body: signoff HEATH
Archives for HEATH: http://www.tempe.gov/archives
--- --- --- --- --- --- --- --- --- --- --- --- --- --