Home » Audio » Thermionic Emissions » Fisher 500C-how hot is too hot?
Re: New day, more tinkering, new results [message #9193 is a reply to message #9192] Wed, 07 September 2005 14:42 Go to previous messageGo to previous message
hurdy_gurdyman is currently offline  hurdy_gurdyman
Messages: 416
Registered: May 2009
Illuminati (1st Degree)
OK, somehow I got things backward in my head. I have an old artical on converting 7591 to 5881, and it calls for a 390 ohm resistor on each cathode. Oh well, I corrected it.

All I have on hand is a 20 ohm resistor, so I tried it. here's the results:

Plate = 400
Screen = 270
Grid = -23
Cathode = 1.1

I can get a pair of 50 ohms the first of the week. I'm leaving for a music festival tomorrow and won't be back till Sunday evening.

Thanks for the patience.

Dave

 
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