[R-390] R-390 Digest, Vol 102, Issue 14
bonddaleena at aol.com
bonddaleena at aol.com
Sat Oct 13 12:46:36 EDT 2012
When I was with IBM, all of our mechanical parts were secured with spline screws. Much better than Allen, IMHO!
ron
N4UE
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To: r-390 <r-390 at mailman.qth.net>
Sent: Sat, Oct 13, 2012 12:14 pm
Subject: R-390 Digest, Vol 102, Issue 14
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Today's Topics:
1. Re: Is this unusual? (Roger Ruszkowski)
2. Off topic Heath TC-1 Tube Tester (Steve Hobensack)
3. Re: Off topic Heath TC-1 Tube Tester (Gary E Kaufman)
----------------------------------------------------------------------
Message: 1
Date: Fri, 12 Oct 2012 15:15:56 -0400 (EDT)
From: Roger Ruszkowski <flowertime01 at wmconnect.com>
Subject: Re: [R-390] Is this unusual?
To: R-390 at mailman.qth.net
Message-ID: <8CF76C522B7F5FF-1B1C-411E0 at webmail-m010.sysops.aol.com>
Content-Type: text/plain; charset="us-ascii"
John,
In 25 words or less, nope.
For a while in 74 - 75 we could not get the spline bolts through military stock.
A common replacement part was the Allen head bolts.
Over 60 plus years a lot of non stock things have been installed to effect a
repair.
Common practice is to swap the odd parts into a gear clamp where it can be seen
for what it is, and then use the spline bolt from the gear clamp on the blind
knob clamp
so you do not get blind sided when trying to get the knobs off.
Roger AI4NI
Hi...I am dropping the front panel on my 390A. I am new at this, my first time
on the panel, so a bit nervous :-)
I have read the TM and am following Chuck's ER DVD closely. So I need to remove
the mcs knob...easy, right? Nope. Couldn't figure it out, couldn't get the
setscrew loostened.
As it turns out, I finally realized, after doning my OptiVisor, that the
setscrew is NOT a Bristol...someone had substituted an allen screw. Not only
that, it was metric...2 mm.
Is this uncommon?
Cheers,
John
K5ENQ
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-----Original Message-----
From: John Saxon <johnbsaxon at yahoo.com>
To: r-390 <r-390 at mailman.qth.net>
Sent: Thu, Oct 11, 2012 8:19 pm
Subject: [R-390] Is this unusual?
Hi...I am dropping the front panel on my 390A. I am new at this, my first time
on the panel, so a bit nervous :-)
I have read the TM and am following Chuck's ER DVD closely. So I need to remove
the mcs knob...easy, right? Nope. Couldn't figure it out, couldn't get the
setscrew loostened.
As it turns out, I finally realized, after doning my OptiVisor, that the
setscrew is NOT a Bristol...someone had substituted an allen screw. Not only
that, it was metric...2 mm.
Is this uncommon?
Cheers,
John
K5ENQ
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Help: http://mailman.qth.net/mmfaq.htm
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------------------------------
Message: 2
Date: Sat, 13 Oct 2012 08:25:23 -0400
From: Steve Hobensack <stevehobensack at hotmail.com>
Subject: [R-390] Off topic Heath TC-1 Tube Tester
To: r390 reflector <r-390 at mailman.qth.net>
Message-ID: <SNT109-W6470FB82C88C7A5C5C0DECA730 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"
Sorry for the off topic post, but there are some knowledgeable people here. The
Heath TC-1 tube tester has a "set line" adjustment on
the meter scale that adjusts for the proper input voltage to the main power
transformer. Sometimes when I insert a tube into the tube
socket, the filament voltage could drop as much as 0.5 volts should the tube
have a heavy current draw. Does the test data roll chart compensate for this?
If I adjust the set-line pot and bring the voltage back up to normal, the needle
(on testing a tube) will move out of the yellow zone (questionable) to the green
zone (good). Sometimes I must move the set-line pot above the meter voltage
centering line to achieve proper filament voltage.
Steve N8YE
------------------------------
Message: 3
Date: Sat, 13 Oct 2012 08:49:43 -0400
From: Gary E Kaufman <gkaufman at the-planet.org>
Subject: Re: [R-390] Off topic Heath TC-1 Tube Tester
To: Steve Hobensack <stevehobensack at hotmail.com>, ">>
\"r-390 at mailman.qth.net\"" <r-390 at mailman.qth.net>
Message-ID: <50796367.7050606 at the-planet.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I don't have a TC-1 manual, but both the TC-2 and TC-3 tell you "Insert
the tube and re-set the SET LINE control if necessary."
- Gary KB1FBI
On 10/13/2012 8:25 AM, Steve Hobensack wrote:
> Sorry for the off topic post, but there are some knowledgeable people here.
The Heath TC-1 tube tester has a "set line" adjustment on
> the meter scale that adjusts for the proper input voltage to the main power
transformer. Sometimes when I insert a tube into the tube
> socket, the filament voltage could drop as much as 0.5 volts should the tube
have a heavy current draw. Does the test data roll chart compensate for this?
If I adjust the set-line pot and bring the voltage back up to normal, the needle
(on testing a tube) will move out of the yellow zone (questionable) to the green
zone (good). Sometimes I must move the set-line pot above the meter voltage
centering line to achieve proper filament voltage.
>
> Steve N8YE
------------------------------
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