[Moon-net] how to prepare a GS35b

[DW Harms]

Hi Erwin,

I alway apply the following three-step procedure on new or "long time not
used" tubes:

1) 1 hour with heather only (blower on!)
2) 24 hours with heather on and HV via a 15 K resistor
4) 1 hour with heather an HV on and let idle current (80-100 mA) flow.

After that your tube is ready!

One warning though; check your inrush current to the filament! I have lost
one tube due to high inrush currents. Mind you, the filament is only 1 Ohm
in cold condition...

73, Dick PA2DW

-----Oorspronkelijk bericht-----
Van: moon-net-bounces at list-serv.davidv.net
[mailto:moon-net-bounces at list-serv.davidv.net] Namens Erwin Witt
Verzonden: dinsdag 1 mei 2007 17:59
Aan: Moonnet
Onderwerp: [Moon-net] how to prepare a GS35b

Hi all,

my GS35b tube gave up and I have to build in a new one.

Does anyone have much experience how to prepare the tube ?

I read much of it but all are meanings:

- temper the tube in a ofen at 60-70 degrees for some hours
- make vakuum in a glass zylinder for some hours
- burn it in the Amp with only heating up to a day

I guess all of this procedure is to get the arc out of the ceramic.

Please send me your comments.

vy73's Erwin/DK5EW
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