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-   -   SE 6SN7/813 direct coupling (http://www.diyaudio.com/forums/tubes-valves/54688-se-6sn7-813-direct-coupling.html)

QuarkStrange 2nd April 2005 09:24 PM

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. :xeye:

rdf 2nd April 2005 10:00 PM

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.

Fuling 2nd April 2005 10:19 PM

Direct coupling - 600V B+ - 10k load = Very low output power!

jacquesF77 2nd April 2005 11:48 PM

And driving a 813 (or any DHT) with a 6SN7 is not the best idea...:xeye:

Cheers

jacques

cedus 4th April 2005 10:26 AM

Quote:

Originally posted by jacquesF77
And driving a 813 (or any DHT) with a 6SN7 is not the best idea...:xeye:

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/

jacquesF77 4th April 2005 11:00 AM

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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