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Old 12th March 2013, 10:07 AM   #1
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Default 5702wb

I have a few tubes " 5702 wb " on stock.
Are there any schematics or ideas to build a preamp or bufferstage?

My power supply from my pcc88 Preamp ( 95V/ 12V Heathing) should work with the 5702, doesen`t it?
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Old 12th March 2013, 05:26 PM   #2
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I looked quickly the data sheet of this tube and based on that I would use the tube as triode connected (G2 and G3 connected to plate).
95 V supply voltage is quite low and does not allow big voltage swing, maybe max. 15 Vpp.
Try 22 k anode resistor and some 680...820 ohms at the cathode.
Fine tune the value of the cathode resistor so that the anode voltage is about 60 V.
Then the anode current is some 2 mA.
This tube has mu = ~25 when triode connected and Rp about 12k ( with 2 mA quiescent current).
The estimated gain is about 20 dB when the cathode resistor is not bypassed.

Last edited by artosalo; 12th March 2013 at 05:28 PM.
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Old 13th March 2013, 01:09 AM   #3
wa2ise is offline wa2ise  United States
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Looking at the datasheet http://www.mif.pg.gda.pl/homepages/f...8/5/5702WB.pdf page 9 this tube in triode mode should work well with your power supplies. I assume your amp will be stereo, so you can run the heaters in series to connect it to the 12V supply.
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