[R-390] Re: little things

[W. Li]

Roy:

Thanks for your kind comments!

1) TB103 
I'll wager that most folks do not know that the native
R390A has a 7.4K phone jack impedance, so that ALL of
our receivers ought to have this mod installed. For
myself, I mounted my 600ohm->8ohm transformer in a
ext. small cabinet that houses a 6" spkr so that it
can be used with any 600 ohm mil recvr. A slide switch
can allow direct connect to the 8ohm spkr if required.


2) C603-C606 
My unit has a panel mounted voltmeter across the test
capacitor, as well as a panel mounted milliammeter.
The only ext connections are to the test cap, and you
just have to take care not to grab the live
connections. ;.) 

The case is, of course, grounded thu its own 3-wire
cord. It would be reasonable to add an isolation
transformer before the Variac. The Variac output is
fused. Should have mentioned that the same toggle that
powers the unit down, also completes the condenser
bleed circuit (which is, of course, opened when you
power up).

3) 220v muffin fans
I erred: mine are not muffins, but German-made 6" case
fans in a cage. Any flattish form factor will work.
Directron.com has a huge selection of new fans by the
way. They only sell to geeks though.

W. Li
Mercer Island, WA

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