[Amps] GI-46B it is!!

[Jeff Blaine]

Bill,

These tubes are all pulse rated.  I think you will find much higher voltages listed under pulse duty.

Of about 12 GI7B (similar structure as the 46b) I only found one which had a high-pot leakage under 5Kv.  And that one had a grid to 
anode short for some reason at about 800V.  Clearly something funky with the tube.  If you can get someone to check them on a 
hi-pot, that's the way to go.

73, Jeff ACØC
www.ac0c.com

-----Original Message----- 
From: Bill Smith
Sent: Thursday, April 14, 2011 5:34 PM
To: amps at contesting.com
Subject: [Amps] GI-46B it is!!

I'll use the GI-46B as the tube replacement in the Swan Mark 1.  They are short enough and are inexpensive.  I have been wanting to 
experiment some with the ceramic tubes anyway.

My current power supply should work ok, correct?  Resting plate voltage of 2900vdc and when the amp is keyed 2500vdc.  It does have 
a low voltage setting of 1500vdc for CW.  I noticed that the GI-46B is only rated up to 2KV plate voltage on the data sheet.

The transformer and power supply components were all replaced in 2005.  It is a voltage doubler circuit.

When the transformer was made I had Heyborer use the next larger diameter wire in the HV and filament winding.  I thought that might 
help with the voltage droop.  Now the filament winding will not be needed.
73,
Bill Smith KO4NR
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