[R-390] Anyone else have R-390 case besides me?

[Todd Bigelow - PS]

Norman Ryan wrote:

> Hello, group,
>
> Notice the slightly larger size of this cabinet
> <http://www.geocities.com/courir26/Ed390A.jpg>.  It has more louvers, to
> be sure, but also more space inside that likely promotes faster
> convection.
>
> This cabinet <http://www.pdq.com/boatanchors/cy-979a/cy-979a.jpg> is
> identical to the ones Mac sold.  Its tag is marked CY-979A.
>
> If an R-390 (non-A) in a CY-979A is operating at the normally higher
> than nominal 115 VAC, heat build-up likely will stress components a bit
> even though the radio is designed to operate at voltages 10 percent
> higher or lower.

That's what I was eluding to earlier, Norman. The larger size of the R-390
cabinet and additional louvers should be a big clue as to heat build
up(which any R-390 owner is well-aware of). Whereas the 'A' model has less
heat to start with and would be fine in the smaller, 'less-louvered'
cabinet. But if you put an R-390 into a cabinet made for the 'A', you could
be baking your tubes, transformers, and all components over time really.

Luckily the 'A' is far more common than the original R-390, so hopefully
this situation won't arise too often. Unfortunately though, cabinets for the
'A' seem more plentiful as well, which might encourage an R-390 owner to
install this radio into what might amount to an oven.

Now, one must wonder about the tag numbers on these cabinets and what they
relate to, if anything particular. It sure would be amusing to find that the
larger cabinet was originally tagged CY-979 and fits the R-390, while the
CY-979A was made for the later 'A' model.

Any cabinet authorities lurking out there?

Boomer,  KA1KAQ