Needed 83 tube.

[Paul Kraemer]

Good point Scott. Hickok had good reason for the 83. Today, silicon diodes 
are a good sub.
Paul K0UYA
----- Original Message ----- 
From: "Scott Johnson" <scottjohnson1 at COX.NET>
To: <BOATANCHORS at LISTS.TEMPE.GOV>
Sent: Saturday, September 06, 2008 11:18 AM
Subject: Re: Needed 83 tube.


> If you are using the 83 for a tube tester, I would recommend using either
> two silicon diodes, or the original 83, as the voltage drop of the 5U4 
> will
> cause erratic performance-that's the reason all the Hickok testers and
> clones use the 83.  The mercury vapor tubes have a nearly constant voltage
> drop over their operating range.
>
>
> Scott W7SVJ
>
> -----Original Message-----
> From: Boat Anchor Owners and Collectors List
> [mailto:BOATANCHORS at LISTS.TEMPE.GOV] On Behalf Of Bob Hardie- W5UQ
> Sent: Saturday, September 06, 2008 8:55 AM
> To: BOATANCHORS at LISTS.TEMPE.GOV
> Subject: Re: [BOATANCHORS-TEMPE] Needed 83 tube.
>
> Yep.
> Bob
> PS... 5U4G's used to make the world go around... and in this case, the
> rectification is "close enough for government work"....
>
> Kevin McDonald wrote:
>> I have a couple of tube testers with the type 83 tube.
>> I collected a couple as spares as they seem to be becoming scarce.
>> I also play with low end vintage audio as the Dynaco and Heathkit series.
>> The Dynaco Stereo 70 uses the 5AR4/GZ-34 tube for a rectifier.
>> I couldn't find native 5AR4 so I went with the Russian version - what
>> crap - consider them $18 fuses.
>> I then looked at the schematic and realized that the 5U4 was a pin for
>> pin replacement.
>> The specs for the 5U4 were a bit less than than the 5AR4 but in the
>> real world the 5U4 is a major trooper while the filiment in the Rusky
>> 5AR4 is good for ~ 6 months at 20 hours/week.
>> The full tube Dynaco sounds great through the old AR3A speakers.
>> I found a very nice 5U4G (big fat glass) to put in my HQ-180 to light
>> it up - what a sweet radio!
>> 5U4's make the boatanchor world go round!
>>
>> Kevin
>>
>> p.s. I didn't know about the 83 -> 5U4 replacement.
>> Does this affect calibration or is rectification rectification?
>>
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>
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