>
>At the risk of being blown away by those more knowledgable:
>Rules of thumb:Higher screen volts give greater amplification.
Yea, verily
>Juggle G1 volts to give appropriate standing current for the mode you wish to
work.
Nay. Except when more splatter is needed, adjust bias to give virtually
zero G1 current with max drive. Adjust ZSAC ["standing
current"]/zero-signal anode current with screen V adj.
>For good linearity good screen regulation is required, more important than
>plate regulation.
Yes
>Back before the audiophile days I experimented a lot with tube audio amps,
>came to the conclusion that the above were sound principles, ...
They are, Barry.
- cheerio
>based on the
>measurement systems available ( grocking square waves and listening with
>young ears).
>73
>
>end
>Barry Kirkwood PhD ZL1DD
>Signal Hill Homestay
>66 Cory Road
>Palm Beach
>Waiheke Island 1240
>NEW ZEALAND
>www.waiheke.co.nz/signal.htm
>----- Original Message -----
>From: Randall DuCharme <ad5gb@yahoo.com>
>To: <amps@contesting.com>
>Sent: Thursday, 15 November, 2001 7:03 PM
>Subject: [AMPS] Screen voltage effects???
>
>
>>
>> Greetings,
>>
>> In designing my screen supply I began to ponder a few
>> things. Wonder if anyone can enlighten me a little.
>> I was trying to decide how much of a usable ( and user
>> adjustable ) voltage range to build into the thing and
>> began to wonder just what the difference is between
>> say 400 and 750 on the screens of an 813.
>>
>> For example...
>>
>> For the 813 the RCA transmitting tube manual
>> recommends 750 volts on the screen and -95 on the
>> control grid for class AB1, and 400 volts screen and
>> -300 on grid 1. They also state a max screen
>> potential of 1100 V.
>>
>> I'm wondering what the effect would be (linearity,
>> distortion, etc) of running the screen at a different
>> value than recommended in either/any class/mode of
>> operation. I'll probably be experimenting with
>> different values but wonder what the expert's thoughts
>> were.
>>
>>
>> Thanks much
>>
>> Randy (AD5GB)
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
end
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