Search found 95 matches

by AnalogJoe
Thu Feb 01, 2024 10:48 am
Forum: The Peabody Lounge
Topic: John Roberts' audio articles
Replies: 16
Views: 16973

Re: John Roberts' audio articles

10 uH is large enough to require a core, unless you like big air core coils; did you ever measure a noticeable increase in distortion when you guys used them? Are you referring to saturation from DC currents or signal? Joe had an AP and ran lots of tests on the circuit before he started using them ...
by AnalogJoe
Wed Jan 31, 2024 8:31 pm
Forum: The Peabody Lounge
Topic: John Roberts' audio articles
Replies: 16
Views: 16973

Re: John Roberts' audio articles

PS: This console was developed in parallel with Peavey's Mark VIII sound reinforcement console. Several sub circuits were otherwise very similar. Those inductors may have been borrowed from the SR board, and crudely incorporated both together instead of separately (one at each device). This was a p...
by AnalogJoe
Wed Jan 31, 2024 8:28 pm
Forum: The Peabody Lounge
Topic: John Roberts' audio articles
Replies: 16
Views: 16973

Re: John Roberts' audio articles

Q = 0.009 with VR1 at 0Ω. Q = 8.25 E-6 at 25KΩ. I've put inductors in Rg to rolloff RFI. Yes, the Q is ridiculously low, but I was wondering about their purpose. At first I thought they might've been chokes, but the clear "L" and uH notation ruled out that theory. RFI rolloff makes sense....
by AnalogJoe
Tue Jan 30, 2024 9:34 pm
Forum: The Peabody Lounge
Topic: John Roberts' audio articles
Replies: 16
Views: 16973

Re: John Roberts' audio articles

Thanks, John!

Question, why did you decide to resonate that cap with the two inductors in the Cohen-style topology pre? The cap/inductors resonate at roughly 1.6 kHz.
peavey pre.png
by AnalogJoe
Fri Jan 26, 2024 7:07 pm
Forum: The Peabody Lounge
Topic: John Roberts' audio articles
Replies: 16
Views: 16973

Re: John Roberts' audio articles

JR. wrote: Fri Jan 26, 2024 1:51 pm I am still embarrassed that in that article I spelled bus wrong.
Were you trying to look good for some British gal? I recall you said that those Peavy girls from sales used to grab a lot of attention.

P.S. That pdf for the AMR console is corrupted.
by AnalogJoe
Fri Jan 26, 2024 11:42 am
Forum: The Peabody Lounge
Topic: John Roberts' audio articles
Replies: 16
Views: 16973

Re: John Roberts' audio articles

The John Roberts' Popular Electronics Articles are here: https://www.proaudiodesignforum.com/forum/php/viewtopic.php?t=1062 I have the Console Design Article which I will post. https://www.proaudiodesignforum.com/forum/php/viewtopic.php?p=17621#p17621 Thank you, Wayne. Great to have all that info h...
by AnalogJoe
Fri Jan 26, 2024 2:44 am
Forum: The Peabody Lounge
Topic: John Roberts' audio articles
Replies: 16
Views: 16973

Re: John Roberts' audio articles

That's too bad, I did check your webpage, though. I didn't know you were into poetry, and you even got published in a newspaper or something similar? Nice. I am too brute to have any sensitivity for poetry; I am unable to distinguish the good from the bad. I will make some web searches for the artic...
by AnalogJoe
Thu Jan 25, 2024 3:36 pm
Forum: The Peabody Lounge
Topic: John Roberts' audio articles
Replies: 16
Views: 16973

John Roberts' audio articles

Hey John.

I was wondering if you have a webpage with all your old articles that you used to write for different magazines? I think that they are a source of valuable information, and I would like to have them.
by AnalogJoe
Wed Jan 24, 2024 5:37 pm
Forum: The Peabody Lounge
Topic: Ok, now they are just trolling us
Replies: 5
Views: 5468

Re: Ok, now they are just trolling us

JR. wrote: Wed Jan 24, 2024 3:18 pm renders now.... "scientists warn to not believe everything you read"... :lol:

JR
These guys are absolutely serious, I have zero doubts about it. Which is what worries me most.
by AnalogJoe
Wed Jan 24, 2024 1:22 pm
Forum: The Peabody Lounge
Topic: Ok, now they are just trolling us
Replies: 5
Views: 5468

Re: Ok, now they are just trolling us

mediatechnology wrote: Wed Jan 24, 2024 4:34 am Image doesn't render.
Weird, I just added an attachment, let me know if it works now.