| Forum: Dave Hecht - Master Tech |
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| Topic: Analog and Digital Specs. |
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| Re: Analog and Digital Specs. [message #341925 is a reply to message #341178 ] |
Fri, 16 May 2008 06:16 |
brendan james
Messages: 3
Registered: May 2008 |
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thats great info. exactly what i was after.
thanks. you each put a piece of the puzzle in for me.
brendan.
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| Topic: Studer A-800. No Power at all. Suggestions? |
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| Re: Studer A-800. No Power at all. Suggestions? [message #341915 is a reply to message #341763 ] |
Fri, 16 May 2008 03:24 |
 Robomatic
Messages: 6
Registered: May 2008 |
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Hi Dave. I Checked all transistors in the machine tonight. All are good except one 2n5686 and one 2n5684 on the MDA. I'll replace those and put it back together and let you know. Man I wish they were socketed. Thanks again for all the help on this. I'm sure I'll run into more issues as I go along, but the machine is slowly coming back.
Rob Deacon. 
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| Re: Studer A-800. No Power at all. Suggestions? [message #341983 is a reply to message #341915 ] |
Fri, 16 May 2008 09:59 |
ssltech
Messages: 1773
Registered: May 2004
Location: Florida (previously UK) |
Platinum Member |
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If you measure a short between collector and emitter on any of the heatsink-mounted transistors, that's DEFINATELY going to cause the flashing stop lamp.
Keith
| MDM (maxdimario) wrote on Fri, 16 November 2007 21:36 |
I have the feeling that I have more experience in my little finger than you do in your whole body about audio electronics..
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| Re: Studer A-800. No Power at all. Suggestions? [message #342028 is a reply to message #340886 ] |
Fri, 16 May 2008 11:43 |
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Larrchild
Messages: 2548
Registered: June 2005
Location: Fort Lauderdale, Florida |
Platinum Member |
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Yeah that's a nice auto-shutdown feature they built in to prevent 2" tape from becoming 1/4" tape when the driver transistors fail.
Larry Janus
http://tubeequipment.com
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| Topic: wire wound resistors? |
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| Re: wire wound resistors? [message #341912 is a reply to message #341848 ] |
Fri, 16 May 2008 02:57 |
Dave Hecht
Messages: 283
Registered: February 2005 |
Active Member |
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| J.J. Blair wrote on Thu, 15 May 2008 18:03 |
BTW, going back to the wild tolerances on these carbon comp resistors, those were mainly the ones I ordered theough Antique Electronic Supply. They were Xicons, etc. I got some KOA Speer ones through Mouser that are dead on. If you are going to use carbon comps, I suggest trying those first.
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JJ,
You sure those KOA Speers are carbon comp, and not carbon film? I was looking for some carbon comp and the only ones I could find on their site or at Mouser were carbon film.
As for the tolerances, older carbon comp were typically not too tight on tolerances. RCD Components is making a carbon comp they claim has a 1% tolerance. Haven't tried them yet, but they look interesting - http://www.rcdcomponents.com/rcd/rcdpdf/CC-FA001.pdf
Dave Hecht
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| Re: wire wound resistors? [message #341916 is a reply to message #341912 ] |
Fri, 16 May 2008 04:08 |
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MagnetoSound
Messages: 961
Registered: October 2007
Location: Southern England |
Gold Member |
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| Dave Hecht wrote on Fri, 16 May 2008 08:57 |
As for the tolerances, older carbon comp were typically not too tight on tolerances.
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Even the tolerance has a tolerance?
'No one has had it better than the baby boomer generation. At a hell of a cost. The saving grace is that the new generations have absolutely no clue how much of their rightful legacy has been squandered - or else it would get pretty ugly out there.'
- Tony Katsabanis
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| Re: wire wound resistors? [message #342151 is a reply to message #342148 ] |
Fri, 16 May 2008 17:46 |
JGreenslade
Messages: 758
Registered: April 2004
Location: UK |
Gold Member |
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| dcollins wrote on Fri, 16 May 2008 23:43 |
IF you can find them, NOS Allen-Bradley carbon comps are the best.
DC
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There's a firm here in the UK with stocks... Guess what? £1-ish EACH! ($2 USD +) They're 5%, from memory. Those current 1% CCs that Dave Hecht linked to look interesting.
I specialise in restoring these mixer / preamps that use the ABs btw. It's a nightmare trying to desolder them as it's all hand-wired. Clients get tetchy if I just reach for the 1% MFs...
BTW - Have bulk foil resistors been mentioned? I haven't checked them out for a while, but I can remember the Vishay ones selling for around £12 ($20+ USD) each when I last saw them. The question is: in the vast majority of applications, does the non-inductive nature make an audible, if indeed measurable difference? From what I understand (correct me if you know better), you're talking about Pico-Henries on conventional 1/4watt Rs...
Justin
Audio is a vocational affliction
"there is no "homeopathic" effect in bits and bytes." - HansP
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| Re: wire wound resistors? [message #342232 is a reply to message #332682 ] |
Fri, 16 May 2008 22:30 |
David Kulka
Messages: 451
Registered: January 2005
Location: Burbank, CA |
Active Member |
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Surplus Sales of Nebraska have an amazing selection of resistors, including most every NOS Allen Bradley carbon comp that you could ever want.
Actually, we have quite a lot of resistors in stock too, though we don't really sell them to the public. This is Cholada standing in front of the resistor section in our shop. We get out a big ladder when we need one of the low resistance values up top. Earthquake could sure mess things up.
http://www.studioelectronics.biz
Service & Restoration of UREI dbx Eventide Marshall AMS Tube Gear and more
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