[Amps] THE SKINNY ON MY AL-82

[Carl]

I said Late 20's Jim!  While I have several battery sets I just display a 
couple of them and havent bothered to get one going.
My interest is AC powered and my oldest is probably 1927; most of my 
collection is 1930 to about 1970 with a mix of consumer, ham, commercial, 
and military.

Carl
KM1H



----- Original Message ----- 
From: "Jim Hargrave" <w5ifp at gvtc.com>
To: "'Carl'" <km1h at jeremy.qozzy.com>; "'Amps group'" <amps at contesting.com>
Sent: Tuesday, December 23, 2014 5:33 PM
Subject: RE: [Amps] THE SKINNY ON MY AL-82


> Carl,
>
> That is good info. If I ever need a NOS resistor for my 1925 "Walbert
> Issofarad" 4 stage TRF, I'll know who to contact.
>
> 73, Jim - w5ifp at gvtc.com
>
>>> -----Original Message-----
>>> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Carl
>>> Sent: Sunday, December 21, 2014 7:17 PM
>>> To: Hardy Landskov; Colin Lamb; Bill Turner; Amps group
>>> Subject: Re: [Amps] THE SKINNY ON MY AL-82
>>>
>>> You havent lived until you find a 47K that became 1-2 Meg which is quite
>>> common in many old receivers and sourced at only 200-250VDC as screen
>>> droppers.
>>>
>>> Over 50+ years of building and servicing tube gear Ive only found a
> handful
>>> that went down in resistance.
>>>
>>> I have a conservative 10K of NOS carbon resistors and about half again 
>>> in
>>> used condition going back to the late 20's
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: "Hardy Landskov" <n7rt at cox.net>
>>> To: "Colin Lamb" <k7fm at teleport.com>; "Bill Turner"
>>> <dezrat at outlook.com>; "Amps group" <amps at contesting.com>
>>> Sent: Sunday, December 21, 2014 5:19 PM
>>> Subject: Re: [Amps] THE SKINNY ON MY AL-82
>>>
>>>
>>> > It's been my experience that the 2 watt ones are the worst. I measured
>>> > 1 meg resistors that have drifted up to 2.5 megs.
>>> > So, think your high voltage is low and your power supply is going
> south?
>>> > Measure the resistors first that feed the voltmeter.
>>> > 73 N7RT
>>> >
>>> > ----- Original Message -----
>>> > From: "Colin Lamb" <k7fm at teleport.com>
>>> > To: "Bill Turner" <dezrat at outlook.com>; "Amps group"
>>> > <amps at contesting.com>
>>> > Sent: Sunday, December 21, 2014 2:46 PM
>>> > Subject: Re: [Amps] THE SKINNY ON MY AL-82
>>> >
>>> >
>>> >> Regarding carbon comp resistors:
>>> >>
>>> >> "Not necessarily. Carbon comp resistors can drift both up and down in
>>> >> value.  I've been replacing them all my life, trust me on this one.
>>> >> They are essentially unpredictable."
>>> >>
>>> >> Many years ago, I tested some 2 watt 250 ohm carbon comp resistors
>>> >> for stability.  I heated them up to dissipate 2 watts in open air.
>>> >> After a relatively short period of time (I do not recall the time,
>>> >> but it was a number of minutes), I measured the resistance and it had
>>> >> increased.  I thought I could go through a number of cycles and have
> it
>>> stabilize.
>>> >> But, every time I ran it through a cycle, the resistance changed.  At
>>> >> first, it went up in resistance.  But, soon it started going down.
>>> >> It never was stable.  And, each resistor was different.
>>> >>
>>> >> I have numerous old Allen-Bradley 1/2 watt resistors on the shelf and
>>> >> some are stable, while some are not.
>>> >>
>>> >> Colin  K7FM
>>> >> _______________________________________________
>>> >> Amps mailing list
>>> >> Amps at contesting.com
>>> >> http://lists.contesting.com/mailman/listinfo/amps
>>> >>
>>> >
>>> >
>>> > _______________________________________________
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>>> >
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