6N2 Tube Srpp Drive Stage - diyAudio
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Old 26th March 2011, 01:51 PM   #1
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Red face 6N2 Tube Srpp Drive Stage

Hello everyone, i have recently just built a SB4000 next generation Gssl and i have got an SRPP to use an input drive stage for teh unit (university project)
however, i now have all the parts in front of me and i have come to a stand still.
Here is the advert for what i have including schematic.

STEREO 6DJ8 ECC88 6922 E88CC SRPP TUBE PREAMPLIFIER KIT on eBay (end time 04-Apr-11 16:30:30 BST)

I was advised to get a dual gang 100k log pot and connect the input from xlr on the sb4000 to one leg of the dual gang pot,
wiper to pin 2 of the tube, and other pot leg to ground.

However there is + and - wires for the xlr's and only one leg to connect to each side of the pot.???
Do i just connect the + wire to the pot leg and leave the - wire out???

And above all will this work as a volume drive for the unit??

Any suggestions or help will be very much appreciated

Thanks again
Shea
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Old 26th March 2011, 06:02 PM   #2
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First of all, for 6N2P (as well as 6SL7) you would need much higher B+ voltage, like 500V
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Old 26th March 2011, 06:21 PM   #3
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Hey thanks for the reply,
So are you saying that this wont work as a drive?

Appreciate it

Shea
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Old 26th March 2011, 07:49 PM   #4
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I mean, 6N23P or 6DJ8 would work better there.
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Old 26th March 2011, 09:27 PM   #5
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Oh i see, ill look into it, is the xlr/pot connection i stated correct tho?
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Old 26th March 2011, 09:51 PM   #6
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Why XLR?
6V AC is to to low, must be 9V.
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Old 26th March 2011, 10:34 PM   #7
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If J3 is your XLR, then it does not appear to be wired correctly; which would explain why R6 is shorted and also why pin 2 of U2 is grounded. With XLR's: pin 1 is ground, pin 2 is hot , and pin 3 is return.
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Old 26th March 2011, 10:51 PM   #8
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The kit on eBay uses a 6N1 not the 6N2.. I have no idea what a SB4000 next generation GSSL might be either - is it a power amp or a source? I'm assuming it is an amplifier in which case you really would be better off driving it with a balanced device.

Note that there are no XLR connectors on this board, just barrier strips to which you can wire your inputs, outputs, and power supply connections.

Note that if you really need balanced drive you could use two of these - one per channel to drive an amp, but in that case you would still need a balanced source, and the volume control would have to be wired in a shunt configuration across the inputs.
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Last edited by kevinkr; 26th March 2011 at 10:53 PM.
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Old 27th March 2011, 06:31 AM   #9
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Thanks for the replys guys!
The sb4000 is a stereo compressor, it works really well wen driven.
The unit is a balanced unit and the srpp is not so it would make the input of the sb4000 unbalanced.
Im trying to see if this hot pin only connection would work
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Old 27th March 2011, 10:56 PM   #10
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Those little PCBs that allow B9A tubes to be mounted at right angles are interesting. I have seem something similar in the Vintec mega tube console. I notice the kit ones use regular PCB tube sockets but Vintec appears to solder the tubes directly to the PCB and then plug in the PCB.

Apart from the convenience of orientation, is there any real advantage to this method of mounting?

Cheers

Ian
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