Re: {Collins} Cleaning (transmitter) variable caps

Yes, That combination of cleaning agent (409 + Household ammonia) is a power
cleaner, but you must be able to rinse very well - as in flood - and then
rewash with a very dilute solution of DI water and dishwasher soap and then
two more cycles of rinsing. The Ammonia can leave a radical that remains and
sets the rig up for corrosion later.

I NEVER use that cleaning method for other than spot very controlled rig
cleaning or cabinets. It is a hugely successful way to clean St. James Grey
cabinets followed by a generous lay on of WD-40.

I would never wash a RF deck in the 409/Ammonia mix.

I would stick with the volatile non-residue solvents approach and be very
careful where it goes.

Bill Carns, N7OTQ
Trustee K0CXX
President, Collins Collectors Association
Editor, Signal Magazine
Wimberley, TX
512 618 2762  (Cell)
512 847 7010  (Home)

-----Original Message-----
From: Collins [] On
Behalf Of Roy Morgan
Sent: Sunday, November 02, 2014 3:25 PM
To: Mark Pilant; collins
Subject: Re: {Collins} Cleaning (transmitter) variable caps

On Nov 2, 2014, at 4:05 PM, Mark Pilant <n1vqw@xxxxxxxx> wrote:

> I spent some time starting to clean up the KWM-2 I recently picked up, ...
> I'm wondering if there are any good ways, short of "dunking" the 
> entire chassis, to clean these in place.


Do not "dunk" it:

One method favored by some experienced Collins restorers is this:

Use 50-50 mixture of 409 and household ammonia.
(VERY strong - use outside only!)

Remove meters and any dials that may be subject to water.
(in the KWM-2 this would involve considerable dis-assembly!)

Seal transformers such as IF transformers with blue painters tape or the

Spray whole radio with spray bottle and 50-50 solution, use paint brushed to
get dirt off.

Use PLENTY of wash/rinse water, preferably warm.

Dry radio in warmth  such as Arizona sun in the summer*, or with clamp-on
reflector lamps at short distance with fan(s) to get lots of air
circulation.  Do not rush the drying process.

*Consider a trip to  dry location in the southern hemisphere where it is now

Follow above treatment with re-assembly, lubrication, and complete

NOTE:  Bill Carns has warned against using such harsh chemical cleaners on
Collins radios, so do be advised that although this method would get you a
like-new looking radio, it may set it up for later corrosion and other
troubles later in its life,

If you extract the tuning cap(s) and possibly final tank coil(s) for
cleaning outside the chassis, put them in the dishwasher for one cycle.
Then very carefully re-lubricate and re-install.


Roy Morgan
K1LKY Since 1958

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