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 Post subject: Grid leak...
PostPosted: Sep Wed 26, 2007 2:20 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3936
Location: Warren, MI, USA 48093-6744 N42.50973 W83.02633
Well, I finally started building my next "they said it couldn't be done" project radio yesterday and actually made a lot of progress.

It is a 2-tube regen. But it's been a long time since I've done this. Please suggest a capacitor / resistor value for the grid leak? I was considering a 3.3 meg and a .001 - do these sound anything remotely correct?

On another thought, what would be a good load resistor for a 6SN7 running about 150volts B+?

I might be able to power this up today or tomorrow...if it works...it will be my next contest entry at the MARC show. It looks wierd, but I've got to do it.

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PostPosted: Sep Wed 26, 2007 4:53 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 30582
Location: Livermore, CA
Hi Bill

Grid capacitor value depends on frequencies to be received. For broadcast most common value is 250pf. For shortwave usually 100pf or less. It's not critical but .001mf is larger than normally used.

Grid resistor can be 3.3 meg. Believe the most popular value was 2.2 meg but I've seen 4.7 and even 10 meg in that circuit.

Plate resistor would depend on the circuit. Do you plan on using an audio interstage transformer? If not 100K resistor would be ok.

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