[R-390] Orange Drop vs ceramic disc

[Cecil Acuff]

Agreed...with OD's and Ceramic Disks.

Cecil...
----- Original Message ----- 
From: "Jerry K" <w5kp at hughes.net>
To: <r-390 at mailman.qth.net>
Sent: Friday, April 01, 2011 10:23 AM
Subject: Re: [R-390] Orange Drop vs ceramic disc


>I realize this happens often on this list, and it's sometimes fun. But
> you guys are definitely trying to pick fly poop out of the pepper,
> collect it in a sock, and beat a dead horse with it. After working on
> military receivers, transmitters, radars, and such since 1960--mostly
> Navy, I've personally yet to see a single disk ceramic OR orange drop
> (that was subjected to normal operating voltages) fail. Ever. Not once.
> It's possible, and it might even happen on super rare occasions
> somewhere, but the average MTBF on both types must be an astounding
> number. And with the FCC limiting U.S. broadcast stations to a 10 KHz
> bandwidth, and hams limited to 6 KHz (LOL!) worrying about a falloff in
> response at 20 KHz is a bit beyond reasonable. I personally like disks,
> mainly because they are cheap as dirt and OD's are increasingly
> expensive for reasons unknown. And disks have worked perfectly in the
> R-390A's I've put them in. The main advantage I can see for OD's is you
> can flip a module over and tell instantly if and where it's been
> recapped, since they stand out like a neon sign.
>
> Kielbasa, anyone? :)
>
> 73 Jerry W5KP (USN Retired)
>
>
>
> On 4/1/2011 9:58 AM, Ben Loper wrote:
>> I may try something this weekend.  I have an HP audio osscilator and a 
>> two
>> trace scope, so maybe just start feeding a signal through a cap and watch 
>> on
>> the scope.  I don't remember the top end but I think 20 khz for the audio
>> oscillator.  I can listen also but my ears crap out at about 10 khz last
>> time I checked..
>>
>> On Fri, Apr 1, 2011 at 9:36 AM, Barry<n4buq at knology.net>  wrote:
>>
>>>   On Fri 01/04/11  9:05 AM , rbethman rbethman at comcast.net sent:
>>>> The difference in performance between the two R-390A/URRs that you did
>>>> have so many variables that it is impossible to say why.  Could be the
>>>> difference in alignment, methodology of restoration, or different
>>>> manufacturer of the actual radio.
>>>>
>>>> You have been using HP equipment lately.  What did you use before that?
>>> At that time, I was using an HP410B, a General Radio GR1001A with a 
>>> Fluke
>>> 1920 counter .  The 1001A was replaced with an HP606A and now an 
>>> HP8640B.  I
>>> still have an HP410B and an HP410C.
>>>
>>> Barry - N4BUQ
>>>
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