Needed 83 tube.

[Scott Johnson]

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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