[ Dan recals products designed by Robert Malter]
Sheingold, Dan wrote:
The one I best remember is the SK5-M, a high-accuracy multiplier/divider. It used triangular-wave modulation and diode selector circuits, and if I recall correctly, had two multipliers (XY and ZW) in a closed loop around a high gain such that Z=XY/W, to get rid of first-order errors. I believe W was used as a decade gain adjustment, and there was also a decade output offset adjustment. An interesting wrinkle was a way of combining redundant diode selectors in the feedback arrangement so that only 6 were used instead of 8 (he called it the "sex-iplier". It was on a chassis behind a (7"?) rack panel.
From: Joe Sousa
Sent: Wednesday, February 25, 2009 11:44 PM
To: Sheingold, Dan
Cc: Bob Pease (Bob Pease)
Subject: Re: FW: Malter obit
The SK5-M is documented in a preliminary spec at this page:
http://www.philbrickarchive.org/sk5-m.htm
Impressive price at $1350. And it used all the premium SK2 series metal case amplifiers.
[snip]
Regards,
-Joe
-----Original Message----- [ Bob Pease responds at ***]
From: Joe Sousa
Sent: Tuesday, February 24, 2009 9:53 PM
To: Sheingold, Dan
Cc: Pease, Robert A
Subject: Re: FW: Malter obit
Dan, thanks for the obit. Even after all these years, it still seems so tragic.
So Bob was the sweat behind the P2 getting into production.
*** I definitely would not say that. I'd say he was the BRAINS, and the Inspiration that got the P2 in production, and kept it rolling.
Can you remember other products that he designed.
**** As DHS mentioned about the K5-M - I can't remember that much that he designed that went into production, but he helped a lot on many other projects. He was DRY and QUIET and GOOD. / rap
**** Joe, Have you ever seen my write-up on the P2 vs. the P7? In the JMW book....
I'll mail you a copy. / rap