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Old 2nd April 2005, 09:24 PM   #1
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Default SE 6SN7/813 direct coupling

If am looking to build a SE amp with 6SN7/813 direct coupling.
I need schematics and informations.

Subsidiary question: if it is possible to use a lower voltage (600v) and a transformer load about 10K.
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Old 2nd April 2005, 10:00 PM   #2
rdf is offline rdf  Canada
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Sorry for veering slightly off-topic QuarkStrange, but can you point me towards a reliable source for 813's? I'm thinking about one triode-mode for the next project.
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Old 2nd April 2005, 10:19 PM   #3
Fuling is offline Fuling  Sweden
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Direct coupling - 600V B+ - 10k load = Very low output power!
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Old 2nd April 2005, 11:48 PM   #4
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And driving a 813 (or any DHT) with a 6SN7 is not the best idea...

Cheers

jacques
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Old 4th April 2005, 10:26 AM   #5
cedus is offline cedus  France
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Quote:
Originally posted by jacquesF77
And driving a 813 (or any DHT) with a 6SN7 is not the best idea...

Cheers

jacques
Why ? 813 is very easy to drive. It requires very slight power to be driven and some people are using 6SN7 quite successfully with it. For a good example see here :
http://homepages.ihug.co.nz/~rwillis/alex/
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Old 4th April 2005, 11:00 AM   #6
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The 6SN7 is a very nice tube, but for driving an output tube, the lesser the Rp, the better it is... I would suggest a 12B4A or a tiode connected 6F6 (or 6V6)

cheers

jacques

PS : I you absolutely want a 8BD socket, use 6BX7
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