Pro Audio Design Forum

mediatechnology wrote:
BTW John there's that trick you did in the TS-1 power supply...

?? JR

My dad was sent over to England for King George's coronation in '30s and IIRC spent some time at Pinewood (?) which I think was the Brit center of film technology back then. He may have picked it up over there... At one point he had some old WE amp racked up in the basement for his Hifi I presume.. ...

Wow, an ERPI man! I have to piece this all together from papers I have but apparently he worked at Vitaphone in '20's, ERPI on '30's, MUZAK late 40's, RCA up until his death late '50s. Vitaphone was a collaboration between Warner Bros, Western Electric and Bell Telephone labs. So I suspect most of ...

raf wrote:Wow, that's truly amazing John....

Obviously, design runs in the family, no? Was this the first "Mobile newsreel"? Or was it for location shoots for movies?

rf

Back in the early days before television short news reels were shown in movie theaters before(?) the features.

JR

I recall using the 723 in my first kit back in the '70s before three terminal regulators became ubiquitous. I'm not sure I see the rationale for using the rail splitter in this design, since a real ground exists at the common point between the two capacitors. If they are trying to deal with one rail...

AFAIK he never got a patent. I vaguely recall some of the pages may have been witnessed (signed by a co-worker). Yes, those are classic engineering notebooks. The pages are numbered for integrity of the chronological order. Gaps with pages left empty are likewise a no-no. I had a classic engineering...

Ok here's that notebook page I found amusing. Sketch of newsreel camera mounted in an old Ford. The actual company this work was done at is ERPI one of the sundry interrelated organizations. FWIW I didn't inherit my dad's neat handwriting or drafting chops, and I even worked as a draftsman long befo...

I have a picture of my dad's ham rig from before he was married... No amateur radio at the house when growing up, but I did my share of SWL. ---- IIRC early DBX VCA were selected discrete (to-92) (edit- that would be to-18) metal can transistors, wedged into a common thermal heatsink to hopefully ke...

I'm kind if busy at the moment but I have some cool stuff I can scan in... engineering sketches of movie cameras mounted into old model A (T?) Fords and such. AFAIK Muzak was not connected to RCA but a letter from the president of WE was addressed to my dad c/o MUZAK. Another data point is we actual...

My dad worked for WE and RCA, among sundry other related companies (Vitaphone, Muzak,,) . He was sent over to England in '30's to record coronation of King George (?). He was a recording engineer for RCA in NYC when he died in 1950's. I have some of his early engineering notebooks which are dated an...