Help about the 6SN7/5692 linestage - diyAudio
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Old 7th November 2005, 11:07 AM   #1
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Default help aboutthe 6SN7/5692Linestage

Hello,

I am thinking to built the 6SN7/5692 dual mono linestage to use it with an dual mono kt88PP.
1 - Could you help me to choose between the two design from FDeGrove : what are the difference, advantage/disadvantage one versus the other
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Old 7th November 2005, 11:09 AM   #2
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Build them and let us know what u think.
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Old 7th November 2005, 02:03 PM   #3
kmtang is offline kmtang  Canada
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Personally, I like the 2nd one with coupling capacitor in between the 6sn7. I have built a similar one which sounds pretty good.

Anyway, it is very easy to try both of them.

Johnny
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Old 7th November 2005, 02:33 PM   #4
hacknet is offline hacknet  Singapore
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i prefer the direct coupled one. its always better to do without those pesky capacitors..!
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Old 7th November 2005, 09:39 PM   #5
amperex is offline amperex  United States
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I also prefer bottom schematic- direct coupled. Ultrawide bandwidth & no coupling cap to color sonics.
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Old 8th November 2005, 07:13 AM   #6
rdf is offline rdf  Canada
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Can someone explain the note regarding stepped attenuators? Why would the type of pot determine the biasing scheme?
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Old 10th November 2005, 07:46 AM   #7
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Thanks

Sure with some small components more i can try the both, so i think i'll do it
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Old 10th November 2005, 10:51 AM   #8
EC8010 is offline EC8010  United Kingdom
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Quote:
Originally posted by rdf
Can someone explain the note regarding stepped attenuators? Why would the type of pot determine the biasing scheme?
I expect that what the writer means is that switched attenuators tend to use switches with carefully machined studs and a wiper with quite high contact pressure, so their contact is more reliable than the wiper scraping over the delicate track of a potentiometer. Thus, it is sufficiently unlikely that the contact will be broken that the switch can be safely used as the grid leak resistor, whereas pots are notorious for failing wiper contacts. (Remember that if the grid-leak resistor fails, the triode becomes a diode and current is only limited by the anode load resistor.)
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Old 10th November 2005, 12:21 PM   #9
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I built one very similar to this design, and was told that placing a diode between the screen and cathode of the 2nd half of the 6SN7 was adviseable for the tube to survive turn-on (Sy suggested this).
Glenn
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