280 rectifier [Boatanchors] NEED TUBE INFO

[cemilton at aol.com]

GA to the list..........

To add to this discussion, WECO (Western Electric Company)  had a tube 
in their inventory labeled as a 253A.  A mercury rectifier, S-17 bulb 
with cap on a bi-pin base.  Oxide filament.  Rated at 2.5v @ 3.0a; 
3.5kv PIV; 250ma out.  The variant listed for this tube is a 280A.  
WECO also had a 280A in their inventory.  It's listed as a mercury 
rectifier, a 253A on a UX base.

So the 2.5v filament exists, and in the form of a 280A.

For anyone who worked for the Bell System, you will recall that WECO 
used a numbering scheme far different than that of some individual 
manufacturers and outside the RMA/EIA registration process.

A bit more history.....................

73 de W4MIL
Chuck





-----Original Message-----
From: rrkrr <rrkrr at comcast.net>
To: 'BOATANCHORS' <boatanchors at mailman.qth.net>
Sent: Sat, 21 Jul 2007 11:22 am
Subject: Re: 280 rectifier [Boatanchors] NEED TUBE INFO


I am not selling anything, but pertinent to the current discussion, the
link below will take you to an auction site sale of a JRC "JX 280"
rectifier tube with the original box.  There is enough resolution in 
the
pictures to read the text on the box, which lists the filament as 5.0V,
2.0A.


http://cgi.ebay.com/JRC-JX-280-Rectifier-Tube-In-Org-Cellophane-Box-MINT_W0QQitemZ120142919948QQihZ002QQcategoryZ67816QQcmdZViewItem 



I believe the "JX" reference is a a manufacturer's designation, as I
find references to "CX-280";"SX-280", and UX-280", all full wave
rectifiers.  NJ7P's tube database (http://www.nj7p.org/Tube.php) shows 
a
pinout but no parameters for type "280" but shows 5V, 2A filament specs
for type "UX-280" and refers to type 5Y3 for other characteristics.


Bob K4ERR


Brian Goldsmith wrote:

> -----Original Message-----

> From: David Hollander
>

>

> Brian - once again, the 280 rectifier is a 2.5 volt filament tube. It 
is
> the2.5 volt version of the 80 rectifier. The National 5887 doghouse 
supply

> uses one to power the FB-7 receiver 2.5 volt tube version. The 
National 5880

> doghouse which is for the 2.5 volt version of the SW-3 also has a 280 
in the

> power supply. The doghouse supplies for the early national receivers 
using 6

> volt tubes uses an 80 rectifier.
>

>

> ***** The following people from the Tube Collectors Association do 
not agree

> with you and present some data sheets to back them up.I agree with 
you about

> the 280A.

>

>
>>> 1) Re: 280 Rectifier

>>>
>     Posted by: "Donald Daykin" daykin at ameritech.net drdaykin

>     Date: Fri Jul 20, 2007 6:54 am ((PDT))

>

> Believe me, the 280 has a 5-volt filament. Since they need separate

> windings, it makes no difference what the voltage is for the other 
tubes.

>

> Donald

>

>
>>> 2) 2c. Re: 280 Rectifier

>>>
>     Posted by: "Roger P. Walker" rp.walker at btconnect.com rp.walker

>     Date: Fri Jul 20, 2007 7:23 am ((PDT))

>

> The 280A is a MV rectifier with a heater of 2.5V 3A but 280 seems to 
be 5V

>

>

>
>>> 3) From: tubecollectorsassociation at yahoogroups.com

>>>
> [mailto:tubecollectorsassociation at yahoogroups.com] On Behalf Of 
Donald

> Daykin

> Sent: 20 July 2007 14:54

> To: tubecollectorsassociation at yahoogroups.com

> Subject: Re: [TCA] 280 Rectifier

>

> Believe me, the 280 has a 5-volt filament. Since they need separate

> windings, it makes no difference what the voltage is for the other 
tubes.

>

>
>>> 4) 2d. Re: 280 Rectifier

>>>
>     Posted by: "Tony" tonydaggs at comcast.net bone433

>     Date: Fri Jul 20, 2007 5:36 pm ((PDT))

>

>

> http://www.nj7p.org/Tube4.php?tube=280

>

> Tony

>

>

>

> Brian Goldsmith.

>

>

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> ** List Administrator - Duane Fischer, W8DBF/W9WZE **
> ** For Assistance: dfischer at usol.com **
> $$ For vintage radio info, see the HCI web site $$
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>

>

>

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