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Hi,
Will 6N1P Russian tubes work OK in a Seduction?
Here's an ebay item number. At the bottom there's a chart (which I admittedly don't understand) comparing the 6N1P tube to 6922, 6DJ8, and others.
Item no. 160326307468
Thanks,
Mark
This comes up fairly often, so there are several threads on the forum about it.
In addition to the heater current difficulty, note that the 6N1P has a much higher plate resistance, so the output cable must have a low capacitance and be short.
Incidentally, some time back there was a Svetlana data sheep published which accidentally exchanges the plate resistance and transconductance specs. This makes the tube appear to be more similar to a 6DJ8 than it really is. This error is still widely propagated - don't fall for it!
I have decided to go with an additional transformer and DC heater supply.
PJ developed the circuit with the 6N1P in mind because it is quiet but decided against it because they are not reliable compared to the 6DJ8 variants. But then again, the 6N1P can be had at $25/dozen.
I decided I liked the other 6DJ8 Russian variant enough to try the 6N1Ps and will after my 6 week contract job (now at 6 months) ends.
Remember, YOU are the only one who needs to be happy with the sound of your system
Grainger Morrison
There Is Only One (Grainger Morrison, it seems)
the xfrmr will furnish 1.2a, which is just what you need for a pair of them, but that's in AC, so you'll have to rewire to AC if you want to use them. Since there's some loss in the conversion, you can't use 'em in the stock DC-filament setup. Here's a post from Paul J. explaining the math, with some good posts in that thread about tubes for it.
I read the chart and the main concern is as I said, the filamnet supply. Where you read "Ih"(current draw for the heater) the other tubes are 0.3 meaning 300 miliamps. The N1P is double that(0.6 600 miliamps) per tube. So unless there is plenty of extra current available from the filament tranny then I would say not to do it so I do take back my last post. Whenever I build something I use over sized current. This way I have enough reserve no matter what I am doing and the tranny always stays cool.
I think I remember Doc or PJ commenting one time that the seduction power transformer is pretty well maxed out. The small excess that is there acts as a safety margin. So doubling the heater current will likely stress the transformer and possibly cause damage. You could build an external heater power supply. Maybe with a large wall wart or a filament transformer from Hammond or Allied. Keep in mind though that PJ worked long and hard to keep noise at a minimum in the Seduction. Adding external circuitry might raise the noise floor.
Edits: 05/03/09
Do you all remember the days of the Foreplay II when hum was at times an issue.The outboard walwart did wonders. I think if one built a well designed, well filtered, outboard filamant supply, then one could use the 6N1P tube. I have a single tube buffer stage that is on the road right now, and it uses a 6922 tube, I have tried it with 7308's, 6H23's, and several different 6922's. I will purchase a suitable filament power transformer and bypass the internal filament supply so that I can try the 6N1P tube.
Bernie.
In the circuit yes but the filament current draw is higher on the N1P. If the filament supply can support the extra current draw then readjust the supply to accommodate the N1P.
I used them in a front end circuit and I love them as compared to 6922's or 6DJ8's. They give a much more vibrant sound.
Just plug them in and see if you like the sound. You can't do any harm. Worst scenario is that the filament voltage will drop and the filament tranny might run a little warmer.
Paul
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