The RCA Type PB-90
Here is an RCA Type PB-90 with a dull gunmetal finish,
and a frequency response of 30 to 6,000 Hertz.
The PB-90 Master Index number is MI-4000.
Another PB-90 plate with AF added to the MI.
And one more, this with no MI number.
—PB-90 photos courtesy of Mr. Mike Schultz
Here is another nice PB-90 that appeared on eBay
during November-December, 2003.
Another gorgeous RCA Type PB-90 that
appeared on eBay during April, 2004.
Yet another RCA Type PB-90. It went for
$1,534.99 on eBay October 13, 2004.
This one showed up on eBay during August, 2005.
It appears that someone removed its original finish.
This beauty is from the collection of Darrin Warner.
Interesting. Darrin’s (above) is Serial No. 1612, while this one that showed up on eBay is No. 1616.
A “fuzzy” PB-90 that was not protected
against iron filings entering its grilles.
The following six images are provided through the courtesy of Dennis Schrank.
Mr. Schrank comments: “The stand is a PB96A1. It has a half-inch thread and is adjustable with a thumb screw. It’s the only one like it I’ve ever come across. It was a disaster when I got it with plenty of rust and several holes in the base, but a little filler and some RustOleum™ do wonders.”
Judy Garland in Chicago, 1934, with what may be an RCA Type 44-A or PB-90.