Search found 525 matches

by emrr
Sat Jun 13, 2020 3:14 pm
Forum: Test, Measurement and Repair
Topic: Classic Bead Tantalum Capacitor Failure
Replies: 17
Views: 3931

Re: Classic Bead Tantalum Capacitor Failure

I didn't remember seeing the Pease correspondence, thanks.
by emrr
Sun Apr 19, 2020 3:25 pm
Forum: The Peabody Lounge
Topic: I love modern technology
Replies: 23
Views: 801

Re: I love modern technology

Ours don’t scare at all. Though there’s no space for shooting either.
by emrr
Wed Dec 25, 2019 10:21 pm
Forum: The Peabody Lounge
Topic: Merry Christmas
Replies: 43
Views: 49641

Re: Merry Christmas

Merry Christmas everyone!
by emrr
Sat Dec 07, 2019 9:49 am
Forum: Stored Code
Topic: HYPEX DLCP EOL
Replies: 4
Views: 1822

Re: HYPEX DLCP EOL

hmm, new version coming?
by emrr
Thu Oct 10, 2019 6:37 am
Forum: Pro Audio Design
Topic: T Attenuator Termination Kluge
Replies: 42
Views: 10917

Re: T Attenuator Termination Kluge

Good news. T attenuators get screwy so easily if the surroundings are funky. I have measured so many odd things.
by emrr
Mon Sep 16, 2019 10:59 am
Forum: The Peabody Lounge
Topic: Miking the Royal Albert hall
Replies: 5
Views: 1005

Re: Miking the Royal Albert hall

Great article. I noticed that the radio and TV trucks also use different mic arrays. Radio provides a true 4.0 surround mix + stereo fold down and TV provides 5.1 + stereo fold down. Managing all of those sources, feeds, hitting cues and monitoring comms from the crew would seem like a lot of work ...
by emrr
Tue Sep 03, 2019 8:26 am
Forum: Pro Audio Design
Topic: Dielectric Absorption
Replies: 60
Views: 37787

Re: Dielectric Absorption

Slightly off topic, but I'm reminded of the unpleasant discovery of leakage in old can electrolytic caps, when the bright idea is had to tag in new ones to the existing positive terminals and disconnect the can negative leads, thereby saving major mechanical rearrangements. One immediately decides t...
by emrr
Wed Jul 24, 2019 8:22 pm
Forum: Pro Audio Design
Topic: ~QUESTIONS ABOUT "LOCAL"-NEGATIVE-FEEDBACK OUTPUT SECTIONS THAT ARE BASED ON A TERTIARY-WINDING OUTPUT TRANSFORMER~
Replies: 8
Views: 2756

Re: ~QUESTIONS ABOUT "LOCAL"-NEGATIVE-FEEDBACK OUTPUT SECTIONS THAT ARE BASED ON A TERTIARY-WINDING OUTPUT TRANSFORMER~

offhand:

Altec 428B
Collins 356A
Langevin AM-5116-B
RCA BA-21A
Several of the original UA preamps, I think also one or more of their SS types. LA-3A?
There are several Lundahl designed for SS with tertiary feedback I think.
There are others.
by emrr
Sat Jul 06, 2019 10:02 am
Forum: Pro Audio Design
Topic: Transistor Vbe Matching Using A Commutating Chopper-Based Circuit
Replies: 28
Views: 4859

Re: Transistor Vbe Matching Using A Commutating Chopper-Based Circuit

Nice. I could have used that back when I was rebuilding a lot of Altec 9470A/9475A push-pull preamps. Those just don't work at all if vbe is out of scale or mismatched.