[Amps] RE: [701A Tube

[COLIN LAMB]

THe 701A tube is a WWII radar pulse tube.  It has high interelectrode
capacity which makes it less useful on 10 and 15 meters.  In the 50's, it
was sold surplus for $1.95.  You will need to make your own socket (slit
copper tubing).  
With 2,000 volts on the plate and 12 volts of cathode bias, static plate
current will be 75 ma.  Plate dissipation is about 200 watts.  A pair
should draw 400 ma.  Filament is 7.5 volts at 7.5 amps.  

Might make a great fishing float - or perhaps NASA will want them to keep
some of the old spacecraft going.  

73,  Colin  K7FM



> [Original Message]
> From: Randall DuCharme <ad5gb@yahoo.com>
> To: <amps@contesting.com>
 > Date: 9/23/02 8:33:33 PM
> Subject: [Amps] Odd Tube type????
>
> Greetings gurus,
> 
> The club I belong to just received a generous donation
> of quite a bit of ham gear.  Included was an odd
> looking (Navy) tube with 701A marked on it.  It has a
> 4-leaf clover shaped anode and what lookes like a
> grid/cathode pair in each 'leaf' of the clover.  5
> large pins on the base and a single large pin on the
> top.  It's approximately 20%-30% larger than a 4-400. 
> Does anyone have a clue what this thing is or have any
> data on it?
> 
> Many Thanks!
> 
> 
> 
> =====
> Microsoft is not the answer.
> Microsoft is the question.... and the answer is NO!
> 
> Randy  (AD5GB)
> 
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--- COLIN LAMB
- k7fm@teleport.com