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Old 17th May 2008, 09:03 AM   #1
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Default SE parallel output questions

Call me stupid...I can't find anything on how to "convert" a single tube output to parallel output. Are there some straightforward rules of thumb??? My take on it is as follows
1. Halve the OPT impedence
2.Halve the Cathode impedence
3. Keep the Cathode bypass cap the same
4. Double the coupling cap value
5. Beware of the drive section capacities to run twin grides
EG. 'Miller'
Am I barking up the wrong tree here?
My Edition of MJ has NO specific mention of reconfiguring for parallel outputs!
Help please!
_______________________________________Rick....... .
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Old 18th May 2008, 07:32 AM   #2
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>> 4. Double the coupling cap value

Only necessary if you have seperate grid leak resistors or chokes.
You are right on the rest though.

DanL
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Old 18th May 2008, 07:36 AM   #3
Colt45 is offline Colt45  Serbia
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I'd rather not use a common cathode resistor, one tube can hog the current this way. better to have separate, for each tube.
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Old 18th May 2008, 01:33 PM   #4
kmtang is offline kmtang  Canada
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As the cathode resistor is half, you need to double the cathode bypass capacitor in order to maintain the CR time constant which determines the low cut off frequency.

Johnny
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