[Boatanchors] compairson of 5R4 tubes

[Al Klase]

5R4-WGA/WGB should have read T-16 form factor. - Al

On 12/30/2012 11:12 AM, Al Klase wrote:
> John,
>
> Any 5R4 type should work FB in a DX-100 or Viking.  The whole deal 
> with 5R4 seems to be the ability to work with 900 VAC per plate at 
> altitudes up to 40,000 feet.  600 VAC at sea level is a cake walk. You 
> can compare the data sheets by searching on 5R4 here: 
> http://www.mif.pg.gda.pl/homepages/frank/vs.html
>
> The original "plain" 5R4-GY is in a "shouldered tube" ST-16 envelope.
> 5R4-GYA/GYB are in "tubular" T-12 envelopes.
> 5R4-WGA/WGB are in T-12 form factor with "skirted" bases.  These are 
> "ruggedized" and subjected to a high level of inspection in manufacturer.
>
> "Y" seems to be associated with the "micanol" (mica filled bakelite) 
> bases.
>
> Hope that helps,
> Al
>
> On 12/30/2012 9:36 AM, John King wrote:
>> I note that there are various 5R4 tubes with different letters after 
>> the  5R4, which I suspect refers to the bulb shape, height or other 
>> style designations. I am going to order a number of 5R4 tubes for 
>> older transmitters such as DX 100s and early Viking transmitters. Is 
>> there any difference other than style between the various 5R4 tube 
>> versions? Some versions are significantly cheaper than other 
>> versions. What are your thoughts regarding the best bang for the buck 
>> for these old boatanchor transmitters? Thanks and 73, John, K5PGW
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>

-- 
Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/