[Boatanchors] Re: GB> 4-400 tube replacing a 3-400z for circuit test

[Dale Smith]

Speaking of 3-400z.what size allen wrench do you need to get the plate 
connectors off?. 5/64 is too big and 1.5 mm is to small 2mm is too big.
Thanks/de/dale/ka5who
----- Original Message ----- 
From: "Bob Roehrig" <broehrig at aurora.edu>
To: "Greg Mijal" <bluebirdtele at earthlink.net>
Cc: <boatanchors at mailman.qth.net>; <glowbugs at piobaire.mines.uidaho.edu>
Sent: Thursday, December 14, 2006 10:17 PM
Subject: [Boatanchors] Re: GB> 4-400 tube replacing a 3-400z for circuit 
test


> On Thu, 14 Dec 2006, Greg Mijal wrote:
>
>> Has anyone used 4-400's in a made for 3-400Z's amplifier? I have a Swan 
>> MK 1 amplifier built for two 3-400Z's and no tubes.  I do have a set of 
>> 4-400's.  The necessity of this is to evaluate the amplifier overall 
>> circuit, not necessarily "Convert" the amp. Anyone do this one before? 
>> Thanks Greg WA7LYO in sunny Feenix
>
> Ground the screen grid pins (I think pins 2 & 4). I am running 4-400's in 
> my modified Johnson Desk KW that way in G-G. Just make sure you don't 
> exceed max screen grid current. The other problem may be if that amp uses 
> chimneys, the 4-400's may be too tall to fit the chimneys.
>
>
>
>                               Bob Roehrig
>                     Aurora University    Telecom dept.
>                            broehrig at aurora.edu
>                          K9EUI  W9ZGP  WD2XSH/19
>                     630-844-4898      fax 630-844-4222
>                     "Nostalgia is a thing of the past"
> _______________________________________________
> Boatanchors mailing list
> Boatanchors at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/boatanchors
> ** List Administrator - Duane Fischer, W8DBF/W9WZE **   ** For Assistance: 
> dfischer at usol.com **         $$ For vintage radio info, see the HCI web 
> site $$      http://www.w9wze.org