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Gents:
Phil, K5PC, urged limiting heater inrush current on indirectly heated tubes
like the 8877. I also believe, despite that Eimac does not specify
limiting for the 8877, that it is good engineering practice to do so in
amateur service.
I have used Keystone Carbon Company's negative temperature coefficient
thermisters in this application with a very nice, slow ramp up in the
voltage. They are available in many sizes from Digi-Key at little cost but
you have to negotiate their minimum order policy by working it thru their
petty cash or find some friends.
73,
Marv, W6FR
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Gents:<br>
<br>
Phil, K5PC, urged limiting heater inrush current on indirectly heated
tubes like the 8877. I also believe, despite that Eimac does not
specify limiting for the 8877, that it is good engineering practice to do
so in <u>amateur</u> service.<br>
<br>
I have used Keystone Carbon Company's negative temperature coefficient
thermisters in this application with a very nice, slow ramp up in the
voltage. They are available in many sizes from Digi-Key at little
cost but you have to negotiate their minimum order policy by working it
thru their petty cash or find some friends.<br>
<br>
73,<br>
<br>
Marv, W6FR<br>
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